正确答案: C

交换机独占带宽

题目：下面有关交换机的描述中，正确的是（）

解析：C

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举一反三的答案和解析：

[单选题]能够分配给设备的IP，应该是（）

网络有效IP

[单选题]通配符掩码和子网掩码之间的关系是（）。

两者没有什么区别

[单选题]帧中继环境中，在物理端口上，建立子接口的命令是（）

interface

[单选题]路由器上，清空路由表的命令是（）

clearip route*

[单选题]You have a class C network, and you need to design it for 5 usable subnets with each subnet handling a minimum of 18 hosts each. Which of the following network masks should you use?

255.255.255.224

解析：解析：Explanation:ThedefaultsubnetmaskforclassCnetworkis255.255.255.0.Ifonehastocreate5subnets,then3bitsarerequired.With3bitswecancreate8subnets.Theremaining5bitsareusedforHosts.Onecancreate30hostsusing5bitsinhostfield.Thismatcheswiththerequirement.IncorrectAnswers:A,B:ThisisanillegalsubnetmaskforaclassCnetwork,asthethirdoctetcannotbedividedwhenusingaclassCnetwork.C:ThisisthedefaultsubnetmaskforaclassCnetwork.Itprovidesforonenetwork,with254usablehostIPaddresses.E:Thissubnetmaskwillprovidefor14separatenetworkswith14hostseach.Thisdoesnotmeettherequirementofaminimumof18hosts.

[多选题]Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true? (Select two answer choices)

The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.

The DHCP Discover message uses UDP as the transport layer protocol.

解析：A,B 解析：Explanation:

[单选题]两台路由器直连到一起，应该使用的线缆为（）

交叉线缆

[多选题]网络中经常使用DDN服务，请选出DDN的优点（）

传输质量高

使用虚电路

专用线路

解析：ADE