正确答案: D

255.255.255.224

题目：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?

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.

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举一反三的答案和解析：

[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?

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]How could the Ezonexam corporation benefit from using VLANs on their network?(Select three answer choices.)

VLANs allow access to network services based on department, not physical location.

VLANs establish segmented broadcast domains in switched networks.

解析：A,E,F 解析：Explanation:

[单选题]在启用IGRP协议时，所需要的参数是：()

自治系统号

[单选题]哪个ACL可允许主机10.220.158.10访问web服务器192.168.3.244()

access-list 101 permit tcp 10.220.158.10 0.0.0.0 host 192.168.3.224 eq 80