• [单选题]NAT可以被用于完成多种功能,以下不属于其功能的是:()
  • 正确答案 :D
  • 内部网络流量控制


  • [单选题]TELNET工作在OSI哪一层()
  • 正确答案 :D
  • 应用层


  • [单选题]PPP工作在OSI的哪一层()
  • 正确答案 :B
  • 数据链路层


  • [单选题]两个VLAN之间要想通信,应该使用的设备是()
  • 正确答案 :C
  • 路由器


  • [单选题]路由器“路由模式”的提示符号是()
  • 正确答案 :D
  • (config-router)


  • [单选题]路由器当前的模式为“端口模式”,要退回到“特权模式”,应该使用的快捷键为()
  • 正确答案 :B
  • ctrl+z


  • [单选题]The 201.145.32.0 network is subnetted using a /26 mask. How many networks and IP hosts per network exists using this subnet mask?
  • 正确答案 :C
  • 4 networks and 62 hosts

  • 解析:解析:Explanation:

  • [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.

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