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單項(xiàng)選擇題Why will a switch never learn a broadcast address?（）

A.Broadcast frames are never sent to swiches.
B.Broadcast addresses use an incorrect format for the switching table.
C.A broadcast address will never be the source address of a frame.
D.Broadcasts only use network layer addressing.
E.A broadcast frame is never forwarded by a switch.

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1.多項(xiàng)選擇題防火墻有哪些類(lèi)型（）

A.邊際防火墻
B.狀態(tài)防火墻
C.軟件防火墻
D.應(yīng)用網(wǎng)關(guān)防火墻

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2.單項(xiàng)選擇題Which parameter can be tuned to affect the selection of a static route as a backup.when a dynamic protocol is also being used?（）

A.link bandwidth
B.hop count
C.link cost
D.administrative distance

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3.多項(xiàng)選擇題下列哪些是防火墻的局限性（）

A.配置不當(dāng)，防火墻會(huì)引起嚴(yán)重問(wèn)題
B.很多應(yīng)用不能安全通過(guò)防火墻
C.用戶(hù)可能會(huì)積極尋找繞過(guò)防火期接收被阻信息的方法，使網(wǎng)絡(luò)遭受潛在攻擊的危險(xiǎn)
D.未授權(quán)的流量可能經(jīng)隧道或隱藏在合法的流量中通過(guò)防火墻

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4.單項(xiàng)選擇題Which of the following protocols uses both TCP and UDP ports？（）

A.SMTP
B.Telnet
C.FTP
D.DNS

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5.單項(xiàng)選擇題VLAN 3 is not yet configured on your switch.What happens if you set the switchport access vlan 3 commmand interface configuration mode?（）

A.The command is accepted and the respective VLAN is added to vlan dat.
B.The command is rejected.
C.The command is accepted and you must configure the VLAN manually.
D.The port turns amber.

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