cac bac cu lam cho moi thu them phuc tap len thoi.Neu chi dung lai o CCNA hoac cao hon la CCNP thi dau can den cac khai niem trong sach dua ra la on roi.Toi thay may bac o tren toan noi o dau dau day.Vua ko thuc te,vi` khi lam viec co dung may cai nay quai' dau ma tim hieu ky lam j.Lai vua lam cho moi thu them kho' hieu.Tot nhat la hieu ky cac khai niem co ban truoc di.Lam viec ngon lanh voi no.Roi phat trien tiep len.
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