[单选题]OSI七层模型中，传输层的数据封装名称为（）

正确答案 ：D

段

[单选题]配置路由器特权用户“加密密码”的命令是：()

正确答案 ：C

enable secret

[多选题]You are bringing up a new Ezonexam switch, and wish to connect it via a trunk to another switch from a different vendor, which uses the IEEE standard for the trunking method. When setting the encapsulation type on the trunk, what should you configure on the Cisco switch?

正确答案 ：ABCDE

Switch(config) switchport trunk encapsulation isl

Switch(config) switchport trunk encapsulation ietf

Switch(config-if) switchport trunk encapsulation isl

Switch(config-if) switchport trunk encapsulation ietf

Switch(config-if) switchport trunk encapsulation dot1q

解析：解析：Explanation:

[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]OSI七层模型中，“段”是哪一层数据封装的名称（）

正确答案 ：D

传输层

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