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单项选择题

Inabrute－forceattack，whatpercentageofthekeyspacemustana……

Inabrute－forceattack，whatpercentageofthekeyspacemustanattackergenerallysearchthroughuntilheorshefindsthekeythatdecryptsthedata？（）

A.Roughly50percent
B.Roughly66percent
C.com
D.Roughly75percent
E.Roughly10percent
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热门试题

单项选择题Anadministratorissuesthecommandping127.0.0.1fromthecommandlinepromptonaPC.Ifareplyisreceived,whatdoesthisconfirm?（）

A.ThePChasconnectivitywithalocalhost.
B.ThePChasconnectivitywithaLayer3device.
C.ThePChasadefaultgatewaycorrectlyconfigured.
D.ThePChasconnectivityuptoLayer5oftheOSImodel.
E.ThePChastheTCP/IPprotocolstackcorrectlyinstalled.

判断题一个有向图的邻接矩阵中各非零元素之和与图中边的条数相等。

单项选择题RefertoCiscoIOSZone－BasedPolicyFirewall，wherewilltheinspectionpolicybeapplied？（）

A.tothezone-pair
B.tothezone
C.totheinterface
D.totheglobalservicepolicy

单项选择题Whichexampleisofafunctionintendedforcryptographichashing？（）

A.MD65
B.SHA-135
C.XR12
D.MD5

单项选择题Whichofthefollowingistrueregardingtheuseofswitchesandhubsfornetworkconnectivity?（）

A.Switchestakelesstimetoprocessframesthanhubstake.
B.Switchesdonotforwardbroadcasts.
C.Hubscanfilterframes.
D.Usinghubscanincreasetheamountofbandwidthavailabletohosts.
E.Switchesincreasethenumberofcollisiondomainsinthenetwork.

单项选择题CS－MARSworkswith whichIOSfeaturetoaccomplishanomalydetection？（）

A.IOSIPS
B.Autosecure
C.CSA
D.Netflow
E.IOSNetworkFoundationProtection（NFP）
F.IOSFirewall

单项选择题Howwouldyoucharacterizethesourceandtypeinadenialofserviceattackonarouter？（）

A.Byperfornubgashowipinterfacetoseethetypeandsourceoftheattackbasedupontheaccess-listmatches
B.Byperformingashowinterfacetoseethetransmittedload"txload"andreceiveload"rxload"；ifthe
C.Bysettingupanaccess-listtopermitallICMP，TCP，andUDPtrafficwiththelogorlog-input
D.Byapplyinganaccess-listtoallincomingandoutgoinginterfaces，turningoffroute-cacheonall

单项选择题WhichoftheserecommendationsismostappropriateforthecorelayerintheCiscoCampus Architecture？（）

A.UtilizeLayer3switching
B.Utilizesoftwareacceleratedservices
C.Aggregateendusersandsupportafeature-richenvironment
D.Performpacketmanipulationandfilteringatthecorelayer
E.Useredundantpointto-pointLayer2interconnectionswhenwhereisalinkornodefailure.

单项选择题WhichstatementdescribestheWLCv5.2deliveryofamulticastpacketfromawiredPCsourceon VLAN_XtoarespectivewirelessclientusingSSID_X,usingaWLANcontrollerenabledformulticast?（）

A.ApacketisdeliveredtoCiscoWLCandforwardedviamulticasttoallofitsassociatedAPs,andfinally
B.
C.ApacketisdeliveredtoCiscoWLCandforwardedviaunicasttoallofitsassociatedAPs,andfinallyto
D.
E.ApacketisdeliveredtoCiscoWLCandforwardedviamulticasttoallofitsassociatedAPs,discarded
F.
G.ApacketisdeliveredtoCiscoWLCandforwardedviaunicasttoallofitsassociatedAPs,discardedat
H.
I.ApacketisdeliveredtoCiscoWLCandforwardedviamulticasttoallofitsassociatedAPs,discardedatAPswithoutSSID_Xjoinedwirelessclients,andforwardedatAPswithSSID_Xjoinedwirelessclients
J.
K.ApacketisdeliveredtoCiscoWLCandforwardedviaunicasttoallofitsassociatedAPs,discardedat

单项选择题出于成本和安全的考虑，家庭路由器应选择以下哪种认证类型?()

A.WPA/WPA2
B.WEP2
C.WPA-PSK/WPA2-PSK
D.WEP

单项选择题目前BRAS承载家庭宽带最常用的认证方式是PPPOE，下列关于PPPoE的说法正确的是()

A.PPPoE协议将以太网帧封装在ppp报文之内，提供点对点的连接
B.PPPoE协议分为三个不同阶段：Discovery阶段、Offer阶段和PPP
B.PPPoE与PPP协议不同的是，PPPoE的Discovery阶段建立的是一种Client/Server关系，而PPP建立的是一种对等关系。通过Discovery阶段，一个主机(Client)可以发现一个接入集中器(Server)，在Discovery阶段正常结束后，主机和接入集中器就可以通过MAC地址和会话标识来建立PPPoE会话
D.PPPoE和PPP的协商过程完全不同

单项选择题WhatistheWMMuserpriorityofthepacketsgoingdownstreamtotheclientwhentheclientdoesnot supportTSPECbuttheCiscoWLChasACMenabledandWLANpriorityissettoPlatinum?（）

A.background
B.besteffort
C.voice
D.video

单项选择题TheLearning&EventssectionofCisco.comcontainsinformationaboutcertificationandadditionalCiscoeducationalresourcesthatenableyoutofurtheryourprofessionalopportunities.WhichprogramisdetailedinLearningSEvents？（）A.SoftwareApplicationSupportplusUpgradesB.CiscoPartnerConsultativeSupportC.CiscoNetworkingAcademyProgramD.CiscoPartnerSpecializationsProgram

A.comcontainsinformationaboutcertificationandadditionalCiscoeducationalresourcesthatenableyoutofurtheryourprofessionalopportunities.WhichprogramisdetailedinLearningSEvents？（）
A.SoftwareApplicationSupportplusUpgrades
B.CiscoPartnerConsultativeSupport
C.CiscoNetworkingAcademyProgram
D.CiscoPartnerSpecializationsProgram

单项选择题Inadeploymentusingstandaloneaccesspoints，clientssetuptoauthenticatewitheap-peaporeap-ciscowireless（cisco-leap）cannotauthenticatE.whenyouinspectthefailedattemptsreportontheciscosecureacs，youfindthiserror： unknownnetworkaccessservernas. Whichproblemmayhavecausedthisfailure？（）A.misconfiguredipaddressoftheaaaserverontheaccesspointB.misconfiguredeaptypeontheaccesspointC.misconfiguredipaddressoftheaccesspointontheaaaserverD.misconfiguredeaptypeontheaaaserver

A.whenyouinspectthefailedattemptsreportontheciscosecureacs，youfindthiserror："unknownnetworkaccessservernas."Whichproblemmayhavecausedthisfailure？（）
A.misconfiguredipaddressoftheaaaserverontheaccesspoint
B.misconfiguredeaptypeontheaccesspoint
C.misconfiguredipaddressoftheaccesspointontheaaaserver
D.misconfiguredeaptypeontheaaaserver

单项选择题Foralightweightaccesspointtoparticipateinaggressiveloadbalancing，itmusthaveheardtheclientforhowmanyseconds？（）

A.15
B.10
C.1
D.5