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多項(xiàng)選擇題In an Ethernet network, under what two scenarios can devices transmit? （）

A.when they receive a special token
B.when there is a carrier
C.when they detect no other devices are sending
D.when the medium is idle
E.when the server grants access

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1.多項(xiàng)選擇題以下那些是安全審計(jì)工具（）

A.思科一步鎖閉
B.安全審計(jì)向?qū)?br /> C.思科自動安全
D.一鍵關(guān)閉

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2.單項(xiàng)選擇題What is the first 24 bits in a MAC address called?（）

A.NIC
B.BIA
C.OUI
D.VAI

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3.多項(xiàng)選擇題為了獲得更好的虛擬登錄連接的安全性，應(yīng)配置以下哪些參數(shù)（）

A.兩次成功登錄之間的延遲
B.如果檢測到DoS攻擊，應(yīng)關(guān)閉登錄
C.加密所有密碼
D.為登錄建立系統(tǒng)日志

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4.單項(xiàng)選擇題 which address range efficiently summarizes the routing table of the addresses for router main？（）

A.172.16.0.0/18
B.172.16.0.0/16
C.172.16.0.0/20
D.172.16.0.0/21

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5.單項(xiàng)選擇題When is it necessary to use a public IP address on a routing interface?（）

A.Connect a router on a local network.
B.Connect a router to another router.
C.Allow distribution of routes between networks.
D.Translate a private IP address.
E.Connect a network to the Internet.

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