正确答案: E

They provide inter-switch VLAN communication.

题目：You need to decide on which trunking method to implement in the Ezonexam network. What is a characteristic of ISL and 802.1q frame. tagging in a switched LAN environment?

解析：解析：Explanation: A trunk link is the other type of Layer 2 port supported on Cisco switches. When a trunk port is configured, it begins marking frames as they exit the port to indicate which VLAN each frame. is associated with.

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举一反三的答案和解析：

[单选题]You have just purchased a brand new router and wish to have the router prompt you through the initial configuration commands. Which router mode does this describe?

SETUP mode

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)

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]“InsideGlobal”地址在NAT配置里表示的是什么()

一个注册的地址是表示一个内部的主机到外部网络

[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（）

6

[单选题]下列路由协议中，属于链路状态路由协议的是（）

OSPF

[单选题]TCP23是（）协议端口号；UDP69是（）端口号；TCP80是（）端口号。

TELNET TFTP HTTP

[单选题]当在一个接口上使用ipaccess-group99in命令时，以下哪条关于所引用访问控制列表的描述是正确的（）

这个列表是编号型标准ACL，检查进入接口的数据包

[单选题]路由器上端口fa0/0,其最大传输速率是（）Mbit/s

100

[单选题]常见的LSA有几种类型()

6