A.專用ISP B.GRE IP隧道 C.租用線路 D.一個(gè)VPN網(wǎng)關(guān)
A.當(dāng)網(wǎng)絡(luò)管理員因易于配置而更喜歡它 B.使用多鏈路PPP C.當(dāng)需要明文密碼在遠(yuǎn)程主機(jī)上模擬登錄 D.當(dāng)路由器資源有限
A.Serial0/0/0 is administratively down,line protocol is down B.Serial0/0/0 is down,line protocol is down C.Serial0/0/0 is up,line protocol is up D.Serial0/0/0 is up,line protocol is down