[多选题]在路由器上，可以使用的命令有：()

正确答案 ：ABC

ping

show interfaces

show ip route

解析：ABC

[单选题]IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP和掩码结合划分子网时，每个子网的容量为（）

正确答案 ：D

6

[单选题]Which one of the following characteristics is true regarding the use of hubs and switches?

正确答案 ：E

Switches increase the number of collision domains in the network.

解析：解析：Explanation:Switchesincreasesthenumberofcollisionsdomainsinthenetwork.SwitchesthatareconfiguredwithVLANswillreducethesizeofthecollisiondomainsbyincreasingthenumberofcollisiondomainsinanetwork,butmakingthemsmallerthanthatofonebig,flatnetwork.IncorrectAnswers:A.SwitchesarecapableofVLANconfigurations,buthubsarenot.B.Hubsaregenerallytheleastcostlymethodpossibletoconnectmultipledevicestogetherinanetwork.C.Switchesforwardbroadcastsandmulticasts,bydefault,toallportswithinthesameVLAN.Onlyroutersblockallbroadcasttrafficbydefault.D.Switchesandhubscanbeequallyefficientinprocessingframes,intheory.Inpractice,switchesaregenerallymoreefficientastheyusuallyhavemoreCPUandmemoryallocatedtothem,andaregenerallymuchmoreexpensivethanasimplehub.

[单选题]为了连接“帧中继”线路，网络中的路由器需要提供的端口类型为（）

正确答案 ：B

Serial

[单选题]哪个ACL可允许主机10.220.158.10访问web服务器192.168.3.244()

正确答案 ：D

access-list 101 permit tcp 10.220.158.10 0.0.0.0 host 192.168.3.224 eq 80

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