正确答案: ABCD

199.141.27.33 199.141.27.112 199.141.27.119 199.141.27.126

题目：对于IP为199.41.27.0，子网掩码为255.255.255.240，则该IP地址和子网掩码相作用会得到一系列IP，从下列选项中选出属于“有效IP”的选项：()

解析：ABCD

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举一反三的答案和解析：

[单选题]Which one of the following characteristics is true regarding the use of hubs and switches?

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.

[单选题]OSI七层模型中，物理层的数据封装名称为（）

比特

[单选题]在OSI七层模型中，介质工作在哪一层()

物理层

[单选题]工作在OSI第三层的设备是：()

路由器

[单选题]路由器上，设置端口速率的命令是（）

bandwidth

[单选题]IP扩展访问列表的数字标示范围是多少（）。

100-199

[多选题]You need to configure an 802.1Q link on a Ezonexam switch. Which commands, when used together, would do this? (Select two answer choices)

Switch(config-if) switchport mode trunk

Switch(config-if) switchport trunk encapsulation dot1q

解析：C,D 解析：Explanation:

[单选题]扩展IP访问权限表的表号范围是：()

100-199

[单选题]SMTP工作在OSI哪一层（）

应用层