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ROUTE (642-902): IPv6 Questions
Question 1
Which two reductions are the correct reductions of the IPv6 address 2001:0d02:0000:0000:0014:0000:0000:0095? (Choose two)
A – 2001:0d02:::0014:::0095
B – 2001:d02::14::95
C – 2001:d02:0:0:14::95
D – 2001:d02::14:0:0:95
Answer: C D
Explanation
A is not correct because we can’t use triple colons (:::) in IPv6 presentation. B is not correct because we can’t use double colons (::) twice. You can use it only once in any address because if two double colons are
placed in the same address, there will be no way to identify the size of each block of 0s. Remember the following techniques to shorten an IPv6 address:
- Omit leading 0s in the address field, so :0000 can be compressed to just :0 and :0d02 can be com-
pressed to :d02 (but :1d00 can not be compressed to :1d)
- Use double colons (::), but just once, to represent a contiguous block of 0s, so 2001:0d02:0000:0000:0014:0000:0000:0095 can be compressed to 2001:0d02::14:0:0:95 or 2001:0d02:0:0:14::95
Question 2
What is the IPv6 address FF02::2 used for?
A – all hosts in a local segment
B – all routers in a local segment
C – all hosts in a particular rnulticast group
D – all routers in an autonomous system
Answer: B
Explanation
Below lists some reserved and well-known IPv6 multicast address in the reserved multicast address range (FF00:: to FF0F::)
Question 3
Refer to the exhibit. Routers R1 and R2 are IPv6 BGP peers that have been configured to support a neighbor relationship over an IPv4 internetwork. Which three neighbor IP addresses are valid choices to use in the highlighted section of the exhibit? (Choose three)
A – ::0A43:0002
B – 0A43:0002::
C – ::10.67.0.2
D – 10.67.0.2::
E – 0:0:0:0:0:0:10.67.0.2
F – 10.67.0.2:0:0:0:0:0:0
Answer: A C E
Explanation
The automatic tunneling mechanism uses a special type of IPv6 address, termed an “IPv4-compatible” address. An IPv4-compatible address is identified by an all-zeros 96-bit prefix, and holds an IPv4 address in the low-order 32-bits. IPv4-compatible addresses are structured as follows:
Therefore, an IPv4 address of 10.67.0.2 will be written as ::10.67.0.2 or 0:0:0:0:0:0:10.67.0.2 or ::0A43:0002 (with 10[decimal] = 0A[hexa] ; 67[decimal] = 43[hexa] ; 0[hexa] = 0[decimal] ; 2[hexa] = 2[decimal])
Question 4
Refer to the exhibit. The 6to4 overlay tunnel configuration has been applied on each router to join isolated IPv6 networks over a IPv4 network. Which statements regarding the 6to4 overlay tunnel is true?
A -The least significant 32 bits in the address referenced by the ipv6 route 2002::/16 Tunnel0 command will correspond to the interface E0/0 IPv4 address
B – The least significant 32 bits in the address referenced by the ipv6 route 2002::/16 Tunnel0 command will correspond to the IPv4 address assigned to the tunnel source
C – The configuration is invalid since the tunnel source command must be configured with an IPv6 address
D – This is actually a configuration example of an IPv4-compatible tunnel and not a 6to4 tunnel
E – This is actually a configuration example of an ISATAP overlay tunnel and not a 6to4 tunnel
Answer: B
Explanation
6to4 tunnels use IPv6 addresses that concatenate 2002::/16 with the 32-bit IPv4 address of the edge router, creating a 48-bit prefix. The tunnel interface on R1 has an IPv6 prefix of 2002:4065:4001:1::/64, where 4065:4001 is the hexadecimal equivalent of 64.101.64.1, the IPv4 address of its interface in the IPv4 network. The tunnel interface on R2 has an IPv6 prefix of 2002:4065:4101:1::/64, where 4065:4101 is the hexadecimal equivalent of 64.101.65.1, the IPv4 address of its interface in the IPv4 network.
When R1 receives a packet with IPv6 destination address of 2002:4065:4101:1:: (from the left IPv6 network, for example) R1 will:
* Take the IPv6 destination address of that packet (2002:4065:4101:1::) and convert it into an IPv4 address. In this case, the IPv4 address is 40.65.41.01 in hexa, which is 64.101.65.1 in decimal format.
* R1 encapsulates the IPv6 packet in an IPv4 packet with a destination address of 64.101.65.1; the packet is routed normally through the IPv4 network to R2
* R2 receives the IPv4 packet, decapsulates and routes it normally to its final IPv6 destination.
Question 5
What will occur when an IPv6 enabled router running 6to4 must transmit a packet to a remote destination and the next hop is the address of 2002::/16 ?
A – The IPv6 packet has its header removed and replaced with an IPv4 header
B – The IPv6 packet is encapsulated in an IPv4 packet using an IPv4 protocol type of 41
C – The IPv6 packet is dropped because that destination is unable to route IPv6 packets
D – The packet is tagged with an IPv6 header and the IPv6 prefix is included
Answer: B
Question 6
What are three IPv6 transition mechanisms? (Choose three)
A – 6to4 tunneling
B – VPN tunneling
C – GRE tunneling
D – ISATAP tunneling
E – PPP tunneling
F – Teredo tunneling
Answer: A D F
Explanation
Below is a summary of IPv6 transition technologies:
6 to 4 tunneling: This mechanism allows IPv6 sites to communicate with each other over the IPv4 network without explicit tunnel setup. The main advantage of this technology is that it requires no end-node reconfiguration and minimal router configuration but it is not intended as a permanent solution.
ISATAP tunneling (Intra-Site Automatic Tunnel Addressing Protocol): is a mechanism for transmitting IPv6 packets over IPv4 network. The word “automatic” means that once an ISATAP server/router has been set up, only the clients must be configured to connect to it.
Teredo tunneling: This mechanism tunnels IPv6 datagrams within IPv4 UDP datagrams, allowing private IPv4 address and IPv4 NAT traversal to be used.
In fact, GRE tunneling is also a IPv6 transition mechanism but is not mentioned in ROUTE so we shouldn’t choose it (there are 4 types of IPv6 transition mechanisms mentioned in ROUTE; they are: manual, 6-to-4, Teredo and ISATAP).
Question 7
Refer to the exhibit. In the show ipv6 route output, what would the metric be for a summary route that summarizes all three OSPFv3 routes displayed?
A. 20
B. 40
C. 100
D. 120
E. 140
F. 160
Answer: C
Explanation
The metric of a summary route is the highest cost of the routes being summarized. Therefore when summarizing three routes above the highest cost (100) will be chosen.
Question 8
Which statement is true concerning 6to4 tunneling?
A. IPv4 traffic is encapsulated with an IPv6 header.
B. The edge routers can use any locally configured IPv6 address.
C. Hosts and routers inside a 6to4 site will need a special code.
D. An edge router must use IPv6 address of 2002: :/16 in its prefix.
Answer: D
Explanation
6to4 tunnels use IPv6 addresses that concatenate 2002::/16 with the 32-bit IPv4 address of the edge router, creating a 48-bit prefix.
Question 9
Which two statements are true about using IPv4 and IPv6 simultaneously on a network segment? (Choose two)
A. Hosts can be configured to receive both IPv4 and IPv6 addresses via DHCP.
B. Host configuration: options for IPv4 can be either statically assigned or assigned via DHCP. Host configuration: options for IPv6 can be statically assigned only.
C. IPv6 allows a host to create its own IPv6 address that will allow it to communicate to other devices on a network configured via DHCP. IPv4 does not provide a similar capability for hosts.
D. IPv4 and IPv6 addresses can be simultaneously assigned to a host but not to a router interface.
E. IPv6 provides for more host IP addresses but IPv4 provides for more network addresses.
Answer: A C
Question 10
Which statement describes the difference between a manually configured IPv6 in IPv4 tunnel versus an automatic 6to4 tunnel?
A. A manually configured IPv6 in IPv4 tunnel allows multiple IPv4 destinations.
B. An automatic 6to4 tunnel allows multiple IPv4 destinations.
C. A manually configured IPv6 in IPv4 tunnel does not require dual-stack (IPv4 and IPv6) routers at the tunnel endpoints.
D. An automatic 6to4 tunnel does not require dual-stack (IPv4 and IPv6) routers at the tunnel endpoints.
Answer: B
Explanation
An automatic 6to4 tunnel allows isolated IPv6 domains to be connected over an IPv4 network to remote IPv6 networks. The key difference between automatic 6to4 tunnels and manually configured tunnels is that the tunnel is not point-to-point; it is point-to-multipoint -> it allows multiple IPv4 destinations -> B is correct.
A is not correct because manually 6to4 is point-to-point -> only allows one IPv4 destination.
Configuring 6to4 (manually and automatic) requires dual-stack routers (which supports both IPv4 & IPv6) at the tunnel endpoints because they are border routers between IPv4 & IPv6 networks.
Question 11
You need to explain the differences between an IPv4 header and an IPv6 header. In this comparison, which three statements are true? (Choose three)
A. An IPv6 header is half the size of an IPv4 header.
B. An IPv4 header includes a checksum. However, an IPv6 header does not include one.
C. A router has to recompute the checksum of an IPv6 packet when decrementing the TTL.
D. An IPv6 header is simpler and more efficient than an IPv4 header.
E. The 128-bit IPv6 address makes the IPv6 header more complicated than an IPv4 header.
F. An IPv6 header has twice as many octets as an IPv4 header.
Answer: B D F
Explanation
The image below shows the differences between an IPv4 header and an IPv6 header:
Question 12
What are two rules for compacting IPv6 addresses? (Choose two)
A. The maximum number of times a double colon can replace a 16-bit segment that consists of all zeroes is two.
B. The leading zeroes in any 16-bit segment do not have to be written.
C. Every 16-bit segment that consists of all zeroes can be represented with a single colon.
D. The trailing zeroes in any 16-bit segment do not have to be written.
E. Any single, continuous string of one or more 16-bit segments that consists of all zeroes can be represented with a double colon.
F. Two zeroes in the middle of any 16-bit segment do not have to be written.
Answer: B E
Question 13
How is authentication handled with OSPFv3?
A. OSPFv3 for IPv6 authentication is supported by SHA-1 authentication.
B. OSPFv3 for IPv6 authentication is supported by MD5 authentication.
C. OSPFv3 for IPv6 authentication is supported by IPv6 IPsec.
D. OSPFv3 for IPv6 authentication is supported by IPv4 IPsec.
Answer: C
Question 14
sing the rules for IPv6 addressing, how can the address 2031:0000:240F:0000:0000:09C0:123A:121B be rewritten?
A. 2031:0:240F::09C0:123A:121B
B. 2031::240F::09C0:123A:121B
C. 2031::240F::9C0::123A:121B
D. 2031::240F:::09C0:123A:121B
Answer: A
Question 15
Refer to the exhibit. What is required to complete the IPv6 routing configurations shown?
A. Interface authentication must be configured.
B. The routing processes must be configured with an area ID.
C. IP unicast routing must be enabled.
D. IPv4 addresses must be applied to the interfaces.
Answer: C
Question 16
When implementing OSPFv3, which statement describes the configuration of OSPF areas?
A. In interface configuration mode, the OSPFv3 area ID combination assigns interfaces to OSPFv3 areas.
B. In router configuration mode, the network wildcard area ID combination assigns networks to OSPFv3 areas.
C. In interface configuration mode, the IPv6 OSPF process area ID combination assigns interfaces to OSPFv3 areas.
D. In router configuration mode, the IPv6 OSPF interface area ID combination assigns interfaces to OSPFv3 areas.
Answer: C
Question 17
During the IPv6 autoconfiguration, what does the device append to the 64-bit prefix that it receives from the router to create its IPv6 address?
A. a pseudorandom generated number
B. its locally configured IPv4 address
C. the DHCP-supplied device ID
D. its MAC address
Answer: D
Explanation
The automatic configuration is a great feature of IPv6. Imagine you have to manually configure an IPv6 address with 128-bit long, what a pain! With this feature, it is no longer necessary to configure each host manually. But notice that host only autonomously configures its own Link-local address (the IP address used on a LAN). The Link-local address can be created automatically using a link-local prefix of FE80::/10 and a 64-bit interface identifier (based on 48-bit MAC address).
For example, if your MAC address is 00:12:34:56:78:9a, your 64-bit interface identifier is 0012:34FF:FE56:789a (16-bit FFFE is inserted in the middle). And notice that the notation has been changed because IPv6 addresses require 16-bit pieces to be separated by “:”.
Then, according to the RFC 3513 we need to invert the Universal/Local bit (“U/L” bit) in the 6th position of the first octet (start counting from 0). The “u” bit is set to 1 to indicate Universal, and it is set to zero (0) to indicate local scope. In this case we set this bit to 1 because the MAC address is universally unique. Thus the result is: 0212:34FF:FE56:789a (0012 = 0000 0000 0001 0010 -> turn on 6th bit we get 0000 0010 0001 0010 which is 0212).
Finally, add the link-local prefix FE80 to create the full IPv6 address: FE80:0:0:0:0212:34FF:FE56:789a (or FE80::212:34FF:FE56:789a, in short form).
Note: The reason for inverting the “U/L” bit is to allow ignoring it for short values in the manual configuration case. For example, you can manually assign the short address fc80::1 instead of the long fc80:0:0:0:0200::1.
Question 18
Which three are characteristics of IPv6? (Choose three)
A. An IPv6 address is 128 bits long.
B. An IPv6 header is 20 bits long.
C. An IPv6 header contains the next header field.
D. An IPv6 header contains the protocol field.
E. IPv6 routers send RA messages.
F. An IPv6 header contains the header checksum field.
Answer: A C E
Explanation
A & C are obviously correct based on the theory of IPv6.
When a client sends a Router Solicitation (RS) message, router responds with a Router Advertisement (RA) message which includes prefix, default route and lifetime (how long the host should retain information about the router) -> E is correct.
Question 19
When an IPv6 enabled host boots, it sends a router solicitation (RS) message. An IPv6 router responds with a router advertisement (RA). Which two items are contained in the RA? (Choose two)
A. IPv6 address for the host
B. lifetime of the prefix
C. prefixes for the link
D. keepalive timers
E. request for the local host IP address
F. any route advertisements it has received
Answer: B C
Question 20
What is IPv6 router solicitation?
A. a request made by a node to join a specified multicast group
B. a request made by a node for its IP address
C. a request made by a node for the IP address of the DHCP server
D. a request made by a node for the IP address of the local router
Answer: D
Question 21
Which statement is true about IPv6?
A. Only one IPv6 address is assigned per node.
B. Only one IPv6 address can be assigned to each interface.
C. Each host can autoconfigure its address without the aid of a DHCP setver.
D. IPv6 hosts use anycast addresses to assign IP addresses to interfaces.
Answer: C
Question 22
What does the command clear ipv6 ospf process accomplish?
A. The OSPF adjacencies are cleared and initiated again.
B. The route table is cleared. Then the OSPF neighbors are reformed.
C. The shortest path first (SPF) algorithm is performed on the LSA database.
D. The OSPF database is repopulated. Then the shortest path first (SPF) algorithm is performed.
Answer: D
Explanation
The command “clear ipv6 ospf” will clear the present routing table and force the OSPFv3 process to build a new one. This command is often used when something in the network was changed or for debugging purpose.
When the “process” keyword is added, which means “clear ipv6 ospf process”, the OSPF database is cleared and repopulated then the SPF algorithm is performed.
Question 23
Which statement is true about the command ipv6 ospf 1 area 0?
A. It must be issued in router global configuration mode to enable the OSPF process for IPv6.
B. It must be issued in interface configuration mode to enable the OSPF process for IPv6.
C. It must be issued before the network command to enable the OSPF process for IPv6.
D. It must be issued after the network command to enable the OSPF process for IPv6.
Answer: B
Question 24
Your trainee asks you, in the context of IPv6 and OSPF, what best describes a type 9 LSA? What should you tell her?
A. Link LSA
B. Interarea prefix LSA for ABRs
C. Router LSA
D. Switch LSA
E. Intra-area prefix LSA
F. None of the above
Answer: E
Question 25
You have been tasked with setting up OSPF on an existing router using IPv6. Which command enables OSPF for IPv6 on a router?
A. ipv6 router ospf process-id
B. router ospf process-id
C. router ospf ipv6 process-id
D. ipv6 ospf process-id area-id
E. None of the above
Answer: A
Explanation
The command “ipv6 router ospf process-id” is used to enable an OSPF process on the router. For example:
Router(config)#ipv6 router ospf 1
Note: This command is used in global configuration mode.
Question 26
Which statement is true about the implementation of IPv6 in an already existing IPv4 network?
A. IPv6 can be routed using the same routing protocol versions as IPv4
B. A router routing for IPv6 and IPv4 must convert IPv4 packets to IPv6 packets to route them.
C. IPv4 and IPv6 networks can be routed simultaneously.
D. Only OSPF version 3 can be utilized for routing IPv4 and IPv6.
Answer: C
Explanation
There are many techniques to run implement IPv6 in an already existing IPv4 network. Maybe answer C wants to mention about “dual-stacking” technique. This is the most common technique which only requires edge routers to run both IPv4 and IPv6 while the inside routers only run IPv4. At the edge network, IPv4 packets are converted to IPv6 packets before sending out.
Question 27
Refer to the exhibit. Which statement about this neighbor of R1 is true?
A. OSPFv3 adjacency has been lost, which causes the neighbor to be considered Stale.
B. Aggregate global addresses are always used between IPv6 neighbors.
C. OSPFv3 adjacency will not work between link-local addresses.
D. R1 used ICMP to learn about this neighbor.
Answer: D
Explanation
The “show ipv6 neighbor” command is used to display IPv6 neighbor discovery cache information. We notice that the neighbor IPv6 address is a Link Local address (in the range of FE80::/10) so this neighbor was discovered via the neighbor discovery process. The IPv6 neighbor discovery process uses ICMP messages and solicited-node multicast addresses to determine the link-layer address of a neighbor on the same network (local link), to verify the reachability of the neighbor, and to keep track of neighboring routers.
The STALE state indicates more than ReachableTime milliseconds have elapsed since the last positive confirmation was received that the forward path was functioning properly. While in stale state, the device takes no action until a packet is sent.
Note: Nodes on a local link use link-local addresses and do not require globally unique addresses to communicate. IPv6 routers do not forward packets with link-local source or destination addresses to other links.
Question 28
Which IPv6 address correctly compresses the IPv6 unicast address 2001:0:0:0:0DB8:0:0:417A?
A. 2001:0DB8:417A
B. 2001::0DB8::417A
C. 2001:::0DB8::417A
D. 2001:0DB8:0:0:417A
E. 2001::DB8:0:0:417A
F. 2001:::0DB8:0:0:417A
Answer: E
Question 29
Which IPv4-mapped IPv6 address is equivalent to IPv6 address ::ffff:AC11:AC11?
A. ::ffff:10.12.10.12
B. ::ffff:10.14.10.14
C. ::ffff:44.49.44.49
D. ::ffff:161.193.161.193
E. ::ffff:172.17.172.17
F. ::ffff:193.11.193.11
Answer: E
Explanation
The IPv4-mapped IPv6 addresses are regular IPv4 addresses that have been mapped into the IPv6 address space. The range of this kind of IP address is 0:0:0:0:0:FFFF/96 (or ::FFFF/96). They have a set of 16 ones after the initial string of 80 zeroes, and then the IPv4 address. For example, if an IPv4 device has the address 172.17.172.17, it would be represented as 0:0:0:0:0:FFFF:172.17.172.17, or ::FFFF:172.17.172.17. To convert this address to IPv6 address, just write the IPv4 part in binary form and convert a group of four bits into a hexadecimal digit. For example: 172 = 1010 1100 = AC.
Question 30
Which command must be globally enabled on a Cisco router to support IPv6?
A. ip routing ipv6
B. ipv6 unicast-routing
C. ipv6 routing
D. ip classless
E. ipv6 cef
Answer: B
Question 31
What number is a valid representation for the 200F:0000:AB00:0000:0000:0000:0000/56 IPv6 prefix?
A. 200F:0:0:AB/56
B. 200F:0:AB00::/56
C. 200F::AB00/56
D. 200F:AB/56
Answer: B
Question 32
An enterprise has plans to start adding IPv6 support. The initial deployment requires support from some IPv6-only devices that need to access servers that support only IPv4. Which of the following tools would be most appropriate?
A. Native IPv6
B. Point-to-point tunnels
C. Multipoint tunnels
D. NAT-PT
Answer: D
Explanation
The Network Address Translator – Protocol Translator (NAT-PT) defines a set of network-layer translation mechanisms designed to allow nodes that only support IPv4 to communicate with nodes that only support IPv6, during the transition to the use of IPv6 in the Internet.
NAT-PT provides IPv4/IPv6 protocol translation. It resides within an IP router, situated at the boundary of an IPv4 network and an IPv6 network. By installing NAT-PT between an IPv4 and IPv6 network, all IPv4 users are given access to the IPv6 network without modification in the local IPv4-hosts (and vice versa). Equally, all hosts on the IPv6 network are given access to the IPv4 hosts without modification to the local IPv6-hosts. This is accomplished with a pool of IPv4 addresses for assignment to IPv6 nodes on a dynamic basis as sessions are initiated across IPv4-IPv6 boundaries.
Question 33
Using the rules for IPv6 addressing, how can the address 2031:0000:240F:0000:0000:09C0:123A:121B be rewritten?
A. 2031:0:240F::09C0:123A:121B
B. 2031::240F::09C0:123A:121B
C. 2031::240F:9C0::123A:121B
D. 2031::240F:::09C0:123A:121B
Answer: A
Question 34
Which of the following address types are associated with IPv6? (Choose three)
A. Unicast
B. Private
C. Broadcast
D. Public
E. Multicast
F. Anycast
Answer: A E F
Question 35
Which three IPv6 notations represent the same address? (Select three)
A. 2031::130F::9C0:876A:130B
B. 2031:0000:130F:0000:0000:09C0:876A:130B
C. 2031:0:130F:::9C0:876A:130B
D. 2031::130F:0::9C0:876A:130B
E. 2031:0:130F:0:0:09C0:876A: 130B
F. 2031:0:130F::9C0:876A:130B
Answer: B E F
Question 36
An IPv6 overlay tunnel is required to communicate with isolated IPv6 networks across an IPv4 infrastructure. There are currently five IPv6 overlay tunnel types. Which three IPv6 overlay tunnel statements are true? (Choose three)
A. Overlay tunnels can only be configured between border routers capable of supporting IPv4 and IPv6.
B. Overlay tunnels can be configured between border routers or between a border router and a host capable of supporting IPv4 and IPv6.
C. Cisco IOS supports manual, generic, routing encapsulation (GRE), IPv6-compatible. 4to6, and multiprotocol Label Switching (MPLS) Overlay tunneling mechanism.
D. Cisco IOS supports manual, generic routing encapsulation (GRE), IPv4-compatible, 6to4, and Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) overlay tunneling mechanisms.
E. A manual overlay tunnel supports point-to-multipoint tunnels capable of carrying IPv6 and Connectionless Network Service (CLNS) packets.
F. Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure.
Answer: B D F
Question 37
What is the benefit of deploying IPv6 in a campus network using dual stack mode?
A. Dual Stack Mode takes advantage of IPv6 over IPv4 tunnel within a network.
B. IPv4 and IPv6 run alongside one another and have no dependency on each other to function
C. IPv4 and IPv6 share network resources.
D. IPv6 can depend on existing IPv4 routing, QoS, security, and multicast policies.
Answer: B
Question 38
Refer to the exhibit. Which two statements are true about the router configuration? (Choose two)
A. This configuration allows applications on the same segment to communicate via IPv4 or IPv6.
B. This configuration is referred to as a dual-stack 6to4 tunnel.
C. This configuration is referred to as a dual stack.
D. This configuration will attempt to route packets using IPv4 first, and if that fails, then IPv6.
Answer: A C
Question 39
IPv6 host wants to communicate with IPv4 host, what will occur?
A. router will determine IPv4 address
B. host itself has IPv6-IPv4 mapping
C. IPv6 host can use DNS server to find out IPv4 address
D. ICMP can be used to discover right address
Answer: A
Question 40
What is the difference between the IPv6 addresses ::/0 and ::/128?
A. /0 is the unspecified address, and ::/128 is the multicast address.
B. /0 is the unicast address, and ::/128 is the anycast address.
C. /0 is the unicast address, and ::/128 is the multicast address.
D. /0 is the anycast address, and ::/128 is the multicast address.
E. /0 is the default route, and ::/128 is the unspecified address.
F. /0 is the anycast address, and ::/128 is the default address.
Answer: E
Which two reductions are the correct reductions of the IPv6 address 2001:0d02:0000:0000:0014:0000:0000:0095? (Choose two)
A – 2001:0d02:::0014:::0095
B – 2001:d02::14::95
C – 2001:d02:0:0:14::95
D – 2001:d02::14:0:0:95
Answer: C D
Explanation
A is not correct because we can’t use triple colons (:::) in IPv6 presentation. B is not correct because we can’t use double colons (::) twice. You can use it only once in any address because if two double colons are
placed in the same address, there will be no way to identify the size of each block of 0s. Remember the following techniques to shorten an IPv6 address:
- Omit leading 0s in the address field, so :0000 can be compressed to just :0 and :0d02 can be com-
pressed to :d02 (but :1d00 can not be compressed to :1d)
- Use double colons (::), but just once, to represent a contiguous block of 0s, so 2001:0d02:0000:0000:0014:0000:0000:0095 can be compressed to 2001:0d02::14:0:0:95 or 2001:0d02:0:0:14::95
Question 2
What is the IPv6 address FF02::2 used for?
A – all hosts in a local segment
B – all routers in a local segment
C – all hosts in a particular rnulticast group
D – all routers in an autonomous system
Answer: B
Explanation
Below lists some reserved and well-known IPv6 multicast address in the reserved multicast address range (FF00:: to FF0F::)
| Multicast Address | Multicast Group |
| FF01::1 | All IPv6 nodes within the node-local scope |
| FF01::2 | All IPv6 routers within the node-local scope |
| FF02::1 | All IPv6 nodes within the link-local scope |
| FF02::2 | All IPv6 routers within the link-local scope |
| FF02::5 | All OSPFv3 routers within the link-local scope |
| FF02::6 | All OSPFv3 designated routers within the link-local scope |
| FF02::9 | All RIPng routers within the link-local scope |
| FF02::A | All EIGRP routers within the link-local scope |
| FF02::D | All PIM routers within the link-local scope |
| FF02::1:2 | All DHCPv6 agents (servers and relays) within the link-local scope |
| FF05::2 | All IPv6 routers within the site-local scope |
| FF02::1:FF00:0/104 | IPv6 solicited-node multicast address within the link-local scope |
Refer to the exhibit. Routers R1 and R2 are IPv6 BGP peers that have been configured to support a neighbor relationship over an IPv4 internetwork. Which three neighbor IP addresses are valid choices to use in the highlighted section of the exhibit? (Choose three)
B – 0A43:0002::
C – ::10.67.0.2
D – 10.67.0.2::
E – 0:0:0:0:0:0:10.67.0.2
F – 10.67.0.2:0:0:0:0:0:0
Answer: A C E
Explanation
The automatic tunneling mechanism uses a special type of IPv6 address, termed an “IPv4-compatible” address. An IPv4-compatible address is identified by an all-zeros 96-bit prefix, and holds an IPv4 address in the low-order 32-bits. IPv4-compatible addresses are structured as follows:
Question 4
Refer to the exhibit. The 6to4 overlay tunnel configuration has been applied on each router to join isolated IPv6 networks over a IPv4 network. Which statements regarding the 6to4 overlay tunnel is true?
B – The least significant 32 bits in the address referenced by the ipv6 route 2002::/16 Tunnel0 command will correspond to the IPv4 address assigned to the tunnel source
C – The configuration is invalid since the tunnel source command must be configured with an IPv6 address
D – This is actually a configuration example of an IPv4-compatible tunnel and not a 6to4 tunnel
E – This is actually a configuration example of an ISATAP overlay tunnel and not a 6to4 tunnel
Answer: B
Explanation
6to4 tunnels use IPv6 addresses that concatenate 2002::/16 with the 32-bit IPv4 address of the edge router, creating a 48-bit prefix. The tunnel interface on R1 has an IPv6 prefix of 2002:4065:4001:1::/64, where 4065:4001 is the hexadecimal equivalent of 64.101.64.1, the IPv4 address of its interface in the IPv4 network. The tunnel interface on R2 has an IPv6 prefix of 2002:4065:4101:1::/64, where 4065:4101 is the hexadecimal equivalent of 64.101.65.1, the IPv4 address of its interface in the IPv4 network.
When R1 receives a packet with IPv6 destination address of 2002:4065:4101:1:: (from the left IPv6 network, for example) R1 will:
* Take the IPv6 destination address of that packet (2002:4065:4101:1::) and convert it into an IPv4 address. In this case, the IPv4 address is 40.65.41.01 in hexa, which is 64.101.65.1 in decimal format.
* R1 encapsulates the IPv6 packet in an IPv4 packet with a destination address of 64.101.65.1; the packet is routed normally through the IPv4 network to R2
* R2 receives the IPv4 packet, decapsulates and routes it normally to its final IPv6 destination.
Question 5
What will occur when an IPv6 enabled router running 6to4 must transmit a packet to a remote destination and the next hop is the address of 2002::/16 ?
A – The IPv6 packet has its header removed and replaced with an IPv4 header
B – The IPv6 packet is encapsulated in an IPv4 packet using an IPv4 protocol type of 41
C – The IPv6 packet is dropped because that destination is unable to route IPv6 packets
D – The packet is tagged with an IPv6 header and the IPv6 prefix is included
Answer: B
Question 6
What are three IPv6 transition mechanisms? (Choose three)
A – 6to4 tunneling
B – VPN tunneling
C – GRE tunneling
D – ISATAP tunneling
E – PPP tunneling
F – Teredo tunneling
Answer: A D F
Explanation
Below is a summary of IPv6 transition technologies:
6 to 4 tunneling: This mechanism allows IPv6 sites to communicate with each other over the IPv4 network without explicit tunnel setup. The main advantage of this technology is that it requires no end-node reconfiguration and minimal router configuration but it is not intended as a permanent solution.
ISATAP tunneling (Intra-Site Automatic Tunnel Addressing Protocol): is a mechanism for transmitting IPv6 packets over IPv4 network. The word “automatic” means that once an ISATAP server/router has been set up, only the clients must be configured to connect to it.
Teredo tunneling: This mechanism tunnels IPv6 datagrams within IPv4 UDP datagrams, allowing private IPv4 address and IPv4 NAT traversal to be used.
In fact, GRE tunneling is also a IPv6 transition mechanism but is not mentioned in ROUTE so we shouldn’t choose it (there are 4 types of IPv6 transition mechanisms mentioned in ROUTE; they are: manual, 6-to-4, Teredo and ISATAP).
Question 7
Refer to the exhibit. In the show ipv6 route output, what would the metric be for a summary route that summarizes all three OSPFv3 routes displayed?
A. 20
B. 40
C. 100
D. 120
E. 140
F. 160
Answer: C
Explanation
The metric of a summary route is the highest cost of the routes being summarized. Therefore when summarizing three routes above the highest cost (100) will be chosen.
Question 8
Which statement is true concerning 6to4 tunneling?
A. IPv4 traffic is encapsulated with an IPv6 header.
B. The edge routers can use any locally configured IPv6 address.
C. Hosts and routers inside a 6to4 site will need a special code.
D. An edge router must use IPv6 address of 2002: :/16 in its prefix.
Answer: D
Explanation
6to4 tunnels use IPv6 addresses that concatenate 2002::/16 with the 32-bit IPv4 address of the edge router, creating a 48-bit prefix.
Question 9
Which two statements are true about using IPv4 and IPv6 simultaneously on a network segment? (Choose two)
A. Hosts can be configured to receive both IPv4 and IPv6 addresses via DHCP.
B. Host configuration: options for IPv4 can be either statically assigned or assigned via DHCP. Host configuration: options for IPv6 can be statically assigned only.
C. IPv6 allows a host to create its own IPv6 address that will allow it to communicate to other devices on a network configured via DHCP. IPv4 does not provide a similar capability for hosts.
D. IPv4 and IPv6 addresses can be simultaneously assigned to a host but not to a router interface.
E. IPv6 provides for more host IP addresses but IPv4 provides for more network addresses.
Answer: A C
Question 10
Which statement describes the difference between a manually configured IPv6 in IPv4 tunnel versus an automatic 6to4 tunnel?
A. A manually configured IPv6 in IPv4 tunnel allows multiple IPv4 destinations.
B. An automatic 6to4 tunnel allows multiple IPv4 destinations.
C. A manually configured IPv6 in IPv4 tunnel does not require dual-stack (IPv4 and IPv6) routers at the tunnel endpoints.
D. An automatic 6to4 tunnel does not require dual-stack (IPv4 and IPv6) routers at the tunnel endpoints.
Answer: B
Explanation
An automatic 6to4 tunnel allows isolated IPv6 domains to be connected over an IPv4 network to remote IPv6 networks. The key difference between automatic 6to4 tunnels and manually configured tunnels is that the tunnel is not point-to-point; it is point-to-multipoint -> it allows multiple IPv4 destinations -> B is correct.
A is not correct because manually 6to4 is point-to-point -> only allows one IPv4 destination.
Configuring 6to4 (manually and automatic) requires dual-stack routers (which supports both IPv4 & IPv6) at the tunnel endpoints because they are border routers between IPv4 & IPv6 networks.
Question 11
You need to explain the differences between an IPv4 header and an IPv6 header. In this comparison, which three statements are true? (Choose three)
A. An IPv6 header is half the size of an IPv4 header.
B. An IPv4 header includes a checksum. However, an IPv6 header does not include one.
C. A router has to recompute the checksum of an IPv6 packet when decrementing the TTL.
D. An IPv6 header is simpler and more efficient than an IPv4 header.
E. The 128-bit IPv6 address makes the IPv6 header more complicated than an IPv4 header.
F. An IPv6 header has twice as many octets as an IPv4 header.
Answer: B D F
Explanation
The image below shows the differences between an IPv4 header and an IPv6 header:
Question 12
What are two rules for compacting IPv6 addresses? (Choose two)
A. The maximum number of times a double colon can replace a 16-bit segment that consists of all zeroes is two.
B. The leading zeroes in any 16-bit segment do not have to be written.
C. Every 16-bit segment that consists of all zeroes can be represented with a single colon.
D. The trailing zeroes in any 16-bit segment do not have to be written.
E. Any single, continuous string of one or more 16-bit segments that consists of all zeroes can be represented with a double colon.
F. Two zeroes in the middle of any 16-bit segment do not have to be written.
Answer: B E
Question 13
How is authentication handled with OSPFv3?
A. OSPFv3 for IPv6 authentication is supported by SHA-1 authentication.
B. OSPFv3 for IPv6 authentication is supported by MD5 authentication.
C. OSPFv3 for IPv6 authentication is supported by IPv6 IPsec.
D. OSPFv3 for IPv6 authentication is supported by IPv4 IPsec.
Answer: C
Question 14
sing the rules for IPv6 addressing, how can the address 2031:0000:240F:0000:0000:09C0:123A:121B be rewritten?
A. 2031:0:240F::09C0:123A:121B
B. 2031::240F::09C0:123A:121B
C. 2031::240F::9C0::123A:121B
D. 2031::240F:::09C0:123A:121B
Answer: A
Question 15
Refer to the exhibit. What is required to complete the IPv6 routing configurations shown?
| Router1# interface S1/1 ipv6 address 2001:410:FFFF:1::1/64 ipv6 ospf 100 area 0 interface S2/0 ipv6 address 3FFE:B00:FFFF:1::2/64 ipv6 ospf 100 area 1 ipv6 router ospf 100 router-id 10.1.1.3 Router2# interface S3/0 ipv6 address 3FFE:BOO:FFFF:1::1/64 ipv6 ospf 100 area 1 ipv6 router ospf 100 router-id 10.1.1.4 |
B. The routing processes must be configured with an area ID.
C. IP unicast routing must be enabled.
D. IPv4 addresses must be applied to the interfaces.
Answer: C
Question 16
When implementing OSPFv3, which statement describes the configuration of OSPF areas?
A. In interface configuration mode, the OSPFv3 area ID combination assigns interfaces to OSPFv3 areas.
B. In router configuration mode, the network wildcard area ID combination assigns networks to OSPFv3 areas.
C. In interface configuration mode, the IPv6 OSPF process area ID combination assigns interfaces to OSPFv3 areas.
D. In router configuration mode, the IPv6 OSPF interface area ID combination assigns interfaces to OSPFv3 areas.
Answer: C
Question 17
During the IPv6 autoconfiguration, what does the device append to the 64-bit prefix that it receives from the router to create its IPv6 address?
A. a pseudorandom generated number
B. its locally configured IPv4 address
C. the DHCP-supplied device ID
D. its MAC address
Answer: D
Explanation
The automatic configuration is a great feature of IPv6. Imagine you have to manually configure an IPv6 address with 128-bit long, what a pain! With this feature, it is no longer necessary to configure each host manually. But notice that host only autonomously configures its own Link-local address (the IP address used on a LAN). The Link-local address can be created automatically using a link-local prefix of FE80::/10 and a 64-bit interface identifier (based on 48-bit MAC address).
For example, if your MAC address is 00:12:34:56:78:9a, your 64-bit interface identifier is 0012:34FF:FE56:789a (16-bit FFFE is inserted in the middle). And notice that the notation has been changed because IPv6 addresses require 16-bit pieces to be separated by “:”.
Then, according to the RFC 3513 we need to invert the Universal/Local bit (“U/L” bit) in the 6th position of the first octet (start counting from 0). The “u” bit is set to 1 to indicate Universal, and it is set to zero (0) to indicate local scope. In this case we set this bit to 1 because the MAC address is universally unique. Thus the result is: 0212:34FF:FE56:789a (0012 = 0000 0000 0001 0010 -> turn on 6th bit we get 0000 0010 0001 0010 which is 0212).
Finally, add the link-local prefix FE80 to create the full IPv6 address: FE80:0:0:0:0212:34FF:FE56:789a (or FE80::212:34FF:FE56:789a, in short form).
Note: The reason for inverting the “U/L” bit is to allow ignoring it for short values in the manual configuration case. For example, you can manually assign the short address fc80::1 instead of the long fc80:0:0:0:0200::1.
Question 18
Which three are characteristics of IPv6? (Choose three)
A. An IPv6 address is 128 bits long.
B. An IPv6 header is 20 bits long.
C. An IPv6 header contains the next header field.
D. An IPv6 header contains the protocol field.
E. IPv6 routers send RA messages.
F. An IPv6 header contains the header checksum field.
Answer: A C E
Explanation
A & C are obviously correct based on the theory of IPv6.
When a client sends a Router Solicitation (RS) message, router responds with a Router Advertisement (RA) message which includes prefix, default route and lifetime (how long the host should retain information about the router) -> E is correct.
Question 19
When an IPv6 enabled host boots, it sends a router solicitation (RS) message. An IPv6 router responds with a router advertisement (RA). Which two items are contained in the RA? (Choose two)
A. IPv6 address for the host
B. lifetime of the prefix
C. prefixes for the link
D. keepalive timers
E. request for the local host IP address
F. any route advertisements it has received
Answer: B C
Question 20
What is IPv6 router solicitation?
A. a request made by a node to join a specified multicast group
B. a request made by a node for its IP address
C. a request made by a node for the IP address of the DHCP server
D. a request made by a node for the IP address of the local router
Answer: D
Question 21
Which statement is true about IPv6?
A. Only one IPv6 address is assigned per node.
B. Only one IPv6 address can be assigned to each interface.
C. Each host can autoconfigure its address without the aid of a DHCP setver.
D. IPv6 hosts use anycast addresses to assign IP addresses to interfaces.
Answer: C
Question 22
What does the command clear ipv6 ospf process accomplish?
A. The OSPF adjacencies are cleared and initiated again.
B. The route table is cleared. Then the OSPF neighbors are reformed.
C. The shortest path first (SPF) algorithm is performed on the LSA database.
D. The OSPF database is repopulated. Then the shortest path first (SPF) algorithm is performed.
Answer: D
Explanation
The command “clear ipv6 ospf” will clear the present routing table and force the OSPFv3 process to build a new one. This command is often used when something in the network was changed or for debugging purpose.
When the “process” keyword is added, which means “clear ipv6 ospf process”, the OSPF database is cleared and repopulated then the SPF algorithm is performed.
Question 23
Which statement is true about the command ipv6 ospf 1 area 0?
A. It must be issued in router global configuration mode to enable the OSPF process for IPv6.
B. It must be issued in interface configuration mode to enable the OSPF process for IPv6.
C. It must be issued before the network command to enable the OSPF process for IPv6.
D. It must be issued after the network command to enable the OSPF process for IPv6.
Answer: B
Question 24
Your trainee asks you, in the context of IPv6 and OSPF, what best describes a type 9 LSA? What should you tell her?
A. Link LSA
B. Interarea prefix LSA for ABRs
C. Router LSA
D. Switch LSA
E. Intra-area prefix LSA
F. None of the above
Answer: E
Question 25
You have been tasked with setting up OSPF on an existing router using IPv6. Which command enables OSPF for IPv6 on a router?
A. ipv6 router ospf process-id
B. router ospf process-id
C. router ospf ipv6 process-id
D. ipv6 ospf process-id area-id
E. None of the above
Answer: A
Explanation
The command “ipv6 router ospf process-id” is used to enable an OSPF process on the router. For example:
Router(config)#ipv6 router ospf 1
Note: This command is used in global configuration mode.
Question 26
Which statement is true about the implementation of IPv6 in an already existing IPv4 network?
A. IPv6 can be routed using the same routing protocol versions as IPv4
B. A router routing for IPv6 and IPv4 must convert IPv4 packets to IPv6 packets to route them.
C. IPv4 and IPv6 networks can be routed simultaneously.
D. Only OSPF version 3 can be utilized for routing IPv4 and IPv6.
Answer: C
Explanation
There are many techniques to run implement IPv6 in an already existing IPv4 network. Maybe answer C wants to mention about “dual-stacking” technique. This is the most common technique which only requires edge routers to run both IPv4 and IPv6 while the inside routers only run IPv4. At the edge network, IPv4 packets are converted to IPv6 packets before sending out.
Question 27
Refer to the exhibit. Which statement about this neighbor of R1 is true?
A. OSPFv3 adjacency has been lost, which causes the neighbor to be considered Stale.
B. Aggregate global addresses are always used between IPv6 neighbors.
C. OSPFv3 adjacency will not work between link-local addresses.
D. R1 used ICMP to learn about this neighbor.
Answer: D
Explanation
The “show ipv6 neighbor” command is used to display IPv6 neighbor discovery cache information. We notice that the neighbor IPv6 address is a Link Local address (in the range of FE80::/10) so this neighbor was discovered via the neighbor discovery process. The IPv6 neighbor discovery process uses ICMP messages and solicited-node multicast addresses to determine the link-layer address of a neighbor on the same network (local link), to verify the reachability of the neighbor, and to keep track of neighboring routers.
The STALE state indicates more than ReachableTime milliseconds have elapsed since the last positive confirmation was received that the forward path was functioning properly. While in stale state, the device takes no action until a packet is sent.
Note: Nodes on a local link use link-local addresses and do not require globally unique addresses to communicate. IPv6 routers do not forward packets with link-local source or destination addresses to other links.
Question 28
Which IPv6 address correctly compresses the IPv6 unicast address 2001:0:0:0:0DB8:0:0:417A?
A. 2001:0DB8:417A
B. 2001::0DB8::417A
C. 2001:::0DB8::417A
D. 2001:0DB8:0:0:417A
E. 2001::DB8:0:0:417A
F. 2001:::0DB8:0:0:417A
Answer: E
Question 29
Which IPv4-mapped IPv6 address is equivalent to IPv6 address ::ffff:AC11:AC11?
A. ::ffff:10.12.10.12
B. ::ffff:10.14.10.14
C. ::ffff:44.49.44.49
D. ::ffff:161.193.161.193
E. ::ffff:172.17.172.17
F. ::ffff:193.11.193.11
Answer: E
Explanation
The IPv4-mapped IPv6 addresses are regular IPv4 addresses that have been mapped into the IPv6 address space. The range of this kind of IP address is 0:0:0:0:0:FFFF/96 (or ::FFFF/96). They have a set of 16 ones after the initial string of 80 zeroes, and then the IPv4 address. For example, if an IPv4 device has the address 172.17.172.17, it would be represented as 0:0:0:0:0:FFFF:172.17.172.17, or ::FFFF:172.17.172.17. To convert this address to IPv6 address, just write the IPv4 part in binary form and convert a group of four bits into a hexadecimal digit. For example: 172 = 1010 1100 = AC.
Question 30
Which command must be globally enabled on a Cisco router to support IPv6?
A. ip routing ipv6
B. ipv6 unicast-routing
C. ipv6 routing
D. ip classless
E. ipv6 cef
Answer: B
Question 31
What number is a valid representation for the 200F:0000:AB00:0000:0000:0000:0000/56 IPv6 prefix?
A. 200F:0:0:AB/56
B. 200F:0:AB00::/56
C. 200F::AB00/56
D. 200F:AB/56
Answer: B
Question 32
An enterprise has plans to start adding IPv6 support. The initial deployment requires support from some IPv6-only devices that need to access servers that support only IPv4. Which of the following tools would be most appropriate?
A. Native IPv6
B. Point-to-point tunnels
C. Multipoint tunnels
D. NAT-PT
Answer: D
Explanation
The Network Address Translator – Protocol Translator (NAT-PT) defines a set of network-layer translation mechanisms designed to allow nodes that only support IPv4 to communicate with nodes that only support IPv6, during the transition to the use of IPv6 in the Internet.
NAT-PT provides IPv4/IPv6 protocol translation. It resides within an IP router, situated at the boundary of an IPv4 network and an IPv6 network. By installing NAT-PT between an IPv4 and IPv6 network, all IPv4 users are given access to the IPv6 network without modification in the local IPv4-hosts (and vice versa). Equally, all hosts on the IPv6 network are given access to the IPv4 hosts without modification to the local IPv6-hosts. This is accomplished with a pool of IPv4 addresses for assignment to IPv6 nodes on a dynamic basis as sessions are initiated across IPv4-IPv6 boundaries.
Question 33
Using the rules for IPv6 addressing, how can the address 2031:0000:240F:0000:0000:09C0:123A:121B be rewritten?
A. 2031:0:240F::09C0:123A:121B
B. 2031::240F::09C0:123A:121B
C. 2031::240F:9C0::123A:121B
D. 2031::240F:::09C0:123A:121B
Answer: A
Question 34
Which of the following address types are associated with IPv6? (Choose three)
A. Unicast
B. Private
C. Broadcast
D. Public
E. Multicast
F. Anycast
Answer: A E F
Question 35
Which three IPv6 notations represent the same address? (Select three)
A. 2031::130F::9C0:876A:130B
B. 2031:0000:130F:0000:0000:09C0:876A:130B
C. 2031:0:130F:::9C0:876A:130B
D. 2031::130F:0::9C0:876A:130B
E. 2031:0:130F:0:0:09C0:876A: 130B
F. 2031:0:130F::9C0:876A:130B
Answer: B E F
Question 36
An IPv6 overlay tunnel is required to communicate with isolated IPv6 networks across an IPv4 infrastructure. There are currently five IPv6 overlay tunnel types. Which three IPv6 overlay tunnel statements are true? (Choose three)
A. Overlay tunnels can only be configured between border routers capable of supporting IPv4 and IPv6.
B. Overlay tunnels can be configured between border routers or between a border router and a host capable of supporting IPv4 and IPv6.
C. Cisco IOS supports manual, generic, routing encapsulation (GRE), IPv6-compatible. 4to6, and multiprotocol Label Switching (MPLS) Overlay tunneling mechanism.
D. Cisco IOS supports manual, generic routing encapsulation (GRE), IPv4-compatible, 6to4, and Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) overlay tunneling mechanisms.
E. A manual overlay tunnel supports point-to-multipoint tunnels capable of carrying IPv6 and Connectionless Network Service (CLNS) packets.
F. Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure.
Answer: B D F
Question 37
What is the benefit of deploying IPv6 in a campus network using dual stack mode?
A. Dual Stack Mode takes advantage of IPv6 over IPv4 tunnel within a network.
B. IPv4 and IPv6 run alongside one another and have no dependency on each other to function
C. IPv4 and IPv6 share network resources.
D. IPv6 can depend on existing IPv4 routing, QoS, security, and multicast policies.
Answer: B
Question 38
Refer to the exhibit. Which two statements are true about the router configuration? (Choose two)
| ipv6 unicast routing interface fastethernet 0/0 ip address 192.168.200.1 255.255.255.0 ipv6 address 3ffe:b00:c18:1::3/127 |
B. This configuration is referred to as a dual-stack 6to4 tunnel.
C. This configuration is referred to as a dual stack.
D. This configuration will attempt to route packets using IPv4 first, and if that fails, then IPv6.
Answer: A C
Question 39
IPv6 host wants to communicate with IPv4 host, what will occur?
A. router will determine IPv4 address
B. host itself has IPv6-IPv4 mapping
C. IPv6 host can use DNS server to find out IPv4 address
D. ICMP can be used to discover right address
Answer: A
Question 40
What is the difference between the IPv6 addresses ::/0 and ::/128?
A. /0 is the unspecified address, and ::/128 is the multicast address.
B. /0 is the unicast address, and ::/128 is the anycast address.
C. /0 is the unicast address, and ::/128 is the multicast address.
D. /0 is the anycast address, and ::/128 is the multicast address.
E. /0 is the default route, and ::/128 is the unspecified address.
F. /0 is the anycast address, and ::/128 is the default address.
Answer: E