ccna考试题库.docx
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ccna考试题库
ccna考试题库
QUESTION37
WhataretwocharacteristicsofRIPv2?
(Choosetwo.)
A.classfulroutingprotocol
B.variable-lengthsubnetmasks
C.broadcastaddressing
D.manualroutesummarization
E.usesSPFalgorithmtocomputepath
Answer:
BD
Explanation/Reference:
A:
有类路由协议,错误
B:
可变长度子网掩码,正确
C:
采用广播地址更新,错误
D:
手动路由汇总,正确
E:
使用spf算法计算路径,错误。
QUESTION38
WhichtwoEthernetfiber-opticmodessupportdistancesofgreaterthan550meters?
A.1000BASE-CX
B.100BASE-FX
C.1000BASE-LX
D.1000BASE-SX
E.1000BASE-ZX
Answer:
CE
Explanation/Reference:
A:
最长距离25米
B:
最长距离100米
C:
最长距离3000米
D:
最长距离550米
E:
最长距离70千米
QUESTION39
Whattwothingswillarouterdowhenrunningadistancevectorroutingprotocol?
(Choosetwo.)
A.Sendperiodicupdatesregardlessoftopologychanges.
B.Sendentireroutingtabletoallroutersintheroutingdomain.
C.Usetheshortest-pathalgorithmtothedeterminebestpath.
D.Updatetheroutingtablebasedonupdatesfromtheirneighbors.
E.Maintainthetopologyoftheentirenetworkinitsdatabase.
Answer:
AD
setup
fromaprivilegedprompt?
A.Setupisadditiveandanychangeswillbeaddedtotheconfigscript.
B.Setupeffectivelystartstheconfigurationoverasiftherouterwasbootedforthefirsttime.
C.Setupwillnotrunifanenablesecretpasswordexistsontherouter.
D.Setupwillnotrun,becauseitisonlyviablewhennoconfigurationexistsontherouter.
Answer:
A
Explanation/Reference:
[0]不保存进入IOS命令配置模式
[1]不保存返回设置模式
[2]保存退出
A:
设置和改动被保存到配置脚本
B:
为有效地重新开始配置,如果路由器是第一次启动的配置。
C:
如果配置了密码,设置不会运行
D:
设置不可用,因为它只能在没有配置存在时才有效
QUESTION49
WhichtwostatementsdescribetheCiscoimplementationofVLANs?
(Choosetwo.)
A.VLAN1isthedefaultEthernetVLAN.
B.CDPadvertisementsareonlysentonVLAN1002.
C.Bydefault,themanagementVLANisVLAN1005.
D.Bydefault,theswitchIPaddressisinVLAN1005.
E.VLAN1002through1005areautomaticallycreatedandcannotbedeleted.
Answer:
AE
Explanation/Reference:
考点:
考查vlan知识点。
A:
缺省都存在vlan1,端口都属于vlan1,正确
B:
CDP信息只发送到vlan1002,错误,vlan1002是fddi网络的vlan号。
C:
缺省情况交换机IP配置在vlan1005,错误,vlan1005trnet网络的vlan号。
缺省在vlan1里面。
D:
vlan1002-1005自动生成并不能被删除,正确,他们都是被保留的特殊vlan。
QUESTION56没有理解什么意思
Refertotheexhibit.Whatdoesthe(*)representintheoutput?
A.Packetisdestinedforalocalinterfacetotherouter.
B.Packetwastranslated,butnoresponsewasreceivedfromthedistantdevice.
C.Packetwasnottranslated,becausenoadditionalportsareavailable.
D.Packetwastranslatedandfastswitchedtothedestination.
Answer:
D
Explanation/Reference:
由图中提示信息可以看出,源为10.10.0.2已经有个一个转换,所以后续的数据包快速转发。
WhatarethreeadvantagesofVLANs?
(Choosethree.)
A.VLANsestablishbroadcastdomainsinswitchednetworks.
B.VLANsutilizepacketfilteringtoenhancenetworksecurity.
C.VLANsprovideamethodofconservingIPaddressesinlargenetworks.
D.VLANsprovidealow-latencyinternetworkingalternativetoroutednetworks.
E.VLANsallowaccesstonetworkservicesbasedondepartment,notphysicallocation.
F.VLANscangreatlysimplifyadding,moving,orchanginghostsonthenetwork.
Answer:
AEF
Explanation/Reference:
A:
VLAN在交换网络中建立广播域,正确
B:
利用VLAN的数据包过滤,增强网络的安全性。
错误,没有这个特性。
C:
提供了在大型网络中的保护IP地址的方法。
错误
D:
提供低延迟互联网络替代路由网络。
错误
E:
vlan允许基于逻辑划分的网络访问,不是物理位置。
正确。
F:
VLAN可以大大简化添加,移动或更改网络上的主机。
正确。
QUESTION61
Anadministratorwouldliketoconfigureaswitchoveravirtualterminalconnectionfromlocationsoutside
ofthelocalLAN.Whichofthefollowingarerequiredinorderfortheswitchtobeconfiguredfromaremote
location?
(Choosetwo.)
A.TheswitchmustbeconfiguredwithanIPaddress,subnetmask,anddefaultgateway.
B.TheswitchmustbeconnectedtoarouteroveraVLANtrunk.
C.TheswitchmustbereachablethroughaportconnectedtoitsmanagementVLAN.
D.TheswitchconsoleportmustbeconnectedtotheEthernetLAN.
E.TheswitchmanagementVLANmustbecreatedandhaveamembershipofatleastoneswitchport.
F.TheswitchmustbefullyconfiguredasanSNMPagent.
Answer:
AC
Explanation/Reference:
要想远程管理VLAN,1、交换机配置IP,2、路由可达
QUESTION65
WhichrouterIOScommandscanbeusedtotroubleshootLANconnectivityproblems?
(Choosethree.)
A.ping
B.tracert
C.ipconfig
D.showiproute
E.winipcfg
F.showinterfaces
Answer:
ADF
Explanation/Reference:
A:
测试连通性
D:
查看是否有路由
F:
查看接口是否可用
QUESTION64
WhichofthefollowingarebenefitsofVLANs?
(Choosethree.)
A.Theyincreasethesizeofcollisiondomains.
B.Theyallowlogicalgroupingofusersbyfunction.允许用户从逻辑上进行分组
C.Theycanenhancenetworksecurity.
D.Theyincreasethesizeofbroadcastdomainswhiledecreasingthenumberofcollisiondomains.
E.Theyincreasethenumberofbroadcastdomainswhiledecreasingthesizeofthebroadcastdomains.
F.Theysimplifyswitchadministration.
Answer:
BCE
Explanation/Reference:
考查VLAN的特点
A:
增加冲突域的大小,错误
B:
允许逻辑划分网段,正确
C:
增强网络安全,正确。
不同vlan不能直接通信。
D:
当