[单选题]地址转换NAT的优点是()
正确答案 :B
地址转换可以缓解地地址短缺的问题
[多选题]The Ezonexam network administrator needs to determine what LAN devices to install on the Ezonexam network. What are two advantages of using Layer 2 Ethernet switches over hubs? (Choose two)
正确答案 :AD
Allowing simultaneous frame. transmissions
Filtering frames based on MAC addresses
解析:解析:Explanation:A:Ahalfduplexconnectioniswhereonlyonedevicecansendorreceiveatatime.Afullduplexconnectioniswherebothdevicescansendandreceiveatthesametime.Thus,ifyouhavea100Mbhalf-duplexconnection,onlysendingat100MbORreceivingat100Mbcanhappenatthesametime.Ifyouhavea100Mbfullduplexconnection,youcaneffectivelyget200Mboutofthelinkbecauseyoucouldbesending100Mbandreceiving100Mbatthesametime.D:SwitchesarecapableoffilteringframesbasedonanyLayer2fields.Forexample,aswitchcanbeprogrammedtoreject(notforward)allframessourcedfromaparticularnetwork.Becauselinklayerinformationoftenincludesareferencetoanupper-layerprotocol,switchesusuallycanfilteronthisparameter.Furthermore,filterscanbehelpfulindealingwithunnecessarybroadcastandmulticastpackets.
[单选题]网关的功能()
正确答案 :B
不同网段通信
[单选题]基本IP访问权限表的表号范围是:()
正确答案 :B
1-99
[单选题]路由器上,设置端口速率的命令是()
正确答案 :B
bandwidth
[单选题]SMTP工作在OSI哪一层()
正确答案 :D
应用层
[单选题]默认情况下,RIP定期发送路由更新的时间是()
正确答案 :B
30S
[单选题]交换机转发数据到目的地依靠()
正确答案 :B
MAC地址表
[单选题]命令“ping127.0.0.1”的功能是()
正确答案 :C
测试TCP/IP协议是否正常
[单选题]帧中继环境下,为了区分虚电路,应该使用的地址是()
正确答案 :C
DLCI
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