诺西文档资料开发工程师笔试题.docx

诺西文档资料开发工程师笔试题.docx

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诺西文档资料开发工程师笔试题

TestforCandidates

Directions:

1.Pleaseanswerallthequestionsinanotherpaper.（请在另外一张白纸上答题

2.Fillinyournameinthepaper.（在白纸上写上你的名字

3.Trytofinishtheexamwithin1hour.（尽量在1小时内完成

PartⅠPleasegivetheEnglishandChinesedescriptionstothefollowingabbreviations（20p,2point/question.

e.g.BGP:

BorderGatewayProtocol,边界网关协议

1.ADSL:

2.SIP:

3.AAA:

4.PPPoE:

5.DSLAM:

6.CDMA:

7.ATM:

8.RADIUS:

9.POTS:

10.P-CSCF:

PartⅡThereisonlyonecorrectanswerforeachquestion,pleasemarktherightonewith“√”（10p,1point/question.

11.Therangeof0Hzto4kHzisreservedforanalogvoicetraffic.ADSLoccupiesfrequenciesabovethatrange.WhatistheupperboundaryforcurrentADSLimplementations?

A.3kHz

B.4kHz

C.1.1MHz

D.40kHz

12.WhichlayeroftheOSIreferencemodelisresponsibleforensuringreliableend-to-enddeliveryofdata?

A.Application

B.Presentation

C.Session

D.Transport

E.Network

F.Data-Link

13.

FourLANswitchesareconnectedtogetherasshowninthefigurebelow:

Studythefigurecarefully.WhatisthepurposeoftheSpanningTreeProtocol（STPthatisoperatingintheswitchtopology?

A.Toelectaparticularswitchasbackupdesignatedswitch.

B.TopreventframesfromloopingandhaveoneactiveLayer2paththroughtheswitchesnetwork.

C.Toselectthebestpathtoaremotedestinationthatisonadifferentnetwork.

D.TolearntheMACaddressesofhostattachedtotheswitchesnetwork.

E.TodistributeVLANconfigurationinformationthroughouttheswitchednetwork.

14.Whatprotocolisusedtofindthehardwareaddressofalocaldevice?

A.RARP

B.ARP

C.IP

D.ICMP

E.BootP

15.YouwanttoimplementamechanismthatautomatestheIPconfiguration,includingIPaddress,subnetmask,defaultgateway,andDNSinformation.Whichprotocolwillyouusetoaccomplishthis?

A.SMTP

B.SNMP

C.DHCP

D.ARP

16.WhichclassofIPaddressprovidesamaximumofonly254hostaddressespernetworkID?

A.ClassA

B.ClassB

C.ClassC

D.ClassD

E.ClassE

17.IfyouuseeitherTelnetorFTP,whichisthehighestlayeryouareusingtotransmitdata?

A.Application

B.Presentation

C.Session

D.Transport

18.TheDoDmodel（alsocalledtheTCP/IPstackhasfourlayers.WhichlayeroftheDoDmodelisequivalenttotheNetworklayeroftheOSImodel?

A.Application

B.Host-to-Host

C.Internet

D.NetworkAccess

19.

Thefollowingillustrationshowsadatastructureheader.Whatprotocolisthisheaderfrom?

A.IP

B.ICMP

C.TCP

D.UDP

E.ARP

F.RARP

20.PATallowswhichofthefollowing?

A.One-to-oneIPaddresstranslationthroughtheCPErouter

B.Many-to-oneIPaddresstranslationthroughtheCPErouter

C.Application-specificportnumberstobemanuallyconfiguredfortranslation

D.StaticIPaddresstranslations

PartⅢThereareatleasttwocorrectanswersforeachquestion,pleasemarktherightanswerswith“√”（20p,2point/question.

21.Whatarethedecimalandhexadecimalequivalentsofthebinarynumber10011101?

（Choosetwo.

A.159

B.157

C.185

D.0x9D

E.0xD9

F.0x159

22.WhichofthefollowingdescribetheDHCPDiscovermessage?

（Choosetwo.

A.ItusesFF:

FF:

FF:

FF:

FF:

FFasalayer2broadcast.

B.ItusesUDPastheTransportlayerprotocol.

C.ItusesTCPastheTransportlayerprotocol.

D.Itdoesnotusealayer2destinationaddress.

23.WhichstatementsaretrueregardingICMPpackets?

（Choosetwo.

A.TheyacknowledgereceiptofaTCPsegment.

B.Theyguaranteedatagramdelivery.

C.Theycanprovidehostswithinformationaboutnetworkproblems.

D.TheyareencapsulatedwithinIPdatagrams.

E.TheyareencapsulatedwithinUDPdatagrams.

24.WhichofthefollowingareTCP/IPprotocolsusedattheApplicationlayeroftheOSImodel?

（Choosethree.

A.IP

B.TCP

C.Telnet

D.FTP

E.TFTP

25.WhichofthefollowingareprivateIPaddresses?

A.12.0.0.1

B.168.172.19.39

C.172.20.14.36

D.172.33.194.30

E.192.168.24.43

F.10.141.0.2

26.WhichofthefollowingarereasonswhyWFQmightdiscardapacketinsteadofputtingitintothecorrectqueue?

A.Thehold-queuelimitforallcombinedWFQqueueshasbeenexceeded.

B.ThequeuelengthfortheflowhaspassedtheWREDminimumdropthreshold.

C.TheWFQqueuelengthforthequeuewherethenewlyarrivedpacketshouldbeplacedhasexceededtheCDT.

D.ECNfeedbackhasbeensignaled,requestingthattheTCPsenderslowdown.

27.WhichofthefollowingsarenotfunctionsoftheLANEmulationClient（LEC?

A.Control

B.Dataforwarding

C.Addressresolution

D.ELANassignment

28.Whichofthefollowingprotocolscanprovideauthenticationservices?

A.PIX

B.Logging

C.RADIUS

D.TACACS+

E.Firewallfeatureset

29.InOSPF,wherecanaroutergettherouterIDfrom?

A.LoopbackIPaddress

B.LowestIPaddressofanactiveinterfacewhenOSPFstart