單項(xiàng)選擇題For security reasons, the network administrator needs to prevent pings into the corporate networks from hosts outside the internetwork. Which protocol should be blocked with access control lists？（）

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


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3.單項(xiàng)選擇題The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command？（）

A.This command should be executed from the global configuration mode.
B.The IP address 10.121.16.8 is the local router port used to forward data.
C.102 is the remote DLCI that will receive the information.
D.This command is required for all Frame Relay configurations.
E.The broadcast option allows packets， such as RIP updates， to be forwarded across the PVC

5.多項(xiàng)選擇題What are two reasons that a network administrator would use access lists? (Choose two.) （）。

A.to control vty access into a router  
B.to control broadcast traffic through a router  
C.to filter traffic as it passes through a router  
D.to filter traffic that originates from the router  
E.to replace passwords as a line of defense against security incursions 

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