A.用于檢查網(wǎng)管工作是否正常 B.用于檢查網(wǎng)絡(luò)連接是否可通 C.用于分析網(wǎng)絡(luò)在哪里出現(xiàn)了問題
A.It creates a VLAN 999 interface. B.It designates VLAN 999 for untagged traffic. C.It blocks VLAN 999 traffic from passing on the trunk. D.It designates VLAN 999 as the default for all unknown tagged traffic.
A.在終端設(shè)備之間傳送比特流 B.建立、維護(hù)虛電路,進(jìn)行差錯校驗和流量控制 C.定義電壓、接口、線纜標(biāo)準(zhǔn)、傳輸距離等特性