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單項選擇題出于安全考慮，網(wǎng)絡(luò)管理員需要去防止外網(wǎng)主機PING內(nèi)網(wǎng)，下面哪個協(xié)議應(yīng)該用access control lists限制掉？（）

A.IP
B.ICMP
C.TCP
D.UDP

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1.單項選擇題A company has a small network，consisting of a single switch and a single router. The switch has been configured with two vlans，and route-on-a-stick is being configured on the router for inter-vlan routing. A trunk is configured to connect the switch to the router.What is the minimum number of router subinterfaces that are required for all the vlans to communicate？（）

A.one
B.three
C.two
D.zero

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2.多項選擇題What can a network administrator utilize by using PPP Layer 2 encapsulation (Choose three.) （）。

A.VLAN support
B.compression
C.authentication
D.sliding windows
E.multilink support
F.quality of service

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3.單項選擇題 網(wǎng)絡(luò)管理員在交換機1上創(chuàng)建一個新VLAN并且將主機C和主機D加入到此VLAN中。管理員配置交換機接口FastEthernet0/13到FastEthernet0/24成為新VLAN成員.但是網(wǎng)絡(luò)管理員完成配置以后，主機A可以和主機B通信，但是主機A不能和主機C或者主機D通信。哪個命令可以用來解決這個問題？（）

A.
B.
C.
D.

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4.單項選擇題What is the effect of using the service password-encryption command?（）

A.Only passwords configured after the command has been entered will beencrypted.
B.Only the enable password will be encrypted.
C.Only the enable secret password will beencrypted
D.It will encrypt the secret password and remove the enable secret password from the configuration.
E.It will encrypt all current and future passwords.

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5.多項選擇題Which two are advantages of static routing when compared to dynamic routing？（）

A.Security increases because only the network administrator may change the routing tables.
B.Configuration complexity decreases as network size increases.
C.Routing updates are automatically sent to neighbors.
D.Route summarization is compued automatically by the router.
E.Routing traffic load is reduced when used in stub network links.
F.An efficient algorithm is used to build routing tables，using automatic updates.
G.Routing tables adapt automatically to topology changes.

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