首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
计算机
Refer to the exhibit. The access list has been configured on the S0/0 interface of router RTB in the outbound direction. Which t
Refer to the exhibit. The access list has been configured on the S0/0 interface of router RTB in the outbound direction. Which t
admin
2019-04-08
41
问题
Refer to the exhibit. The access list has been configured on the S0/0 interface of router RTB in the outbound direction. Which two packets, if routed to the interface, will be denied?
access-list 101 deny tcp 192.168.15.32 0.0.0.15 any eq telnet
access-list 101 permit ip any any
选项
A、source ip address: 192.168.15.5; destination port: 21
B、source ip address:, 192.168.15.37 destination port: 21
C、source ip address:, 192.168.15.41 destination port: 21
D、source ip address:, 192.168.15.36 destination port: 23
E、source ip address: 192.168.15.46; destination port: 23
答案
D,E
解析
这个访问列表定义了两个语句: access-list 101 deny tcp 192.168.15.32 0.0.0.15 any eq telnet access-list 101 permit ip any any在访问列表中匹配的顺序是从上到下,如果匹配了某一句,就退出访问列表,如果没有就一直往下匹配,在访问列表中有一句隐含的拒绝所有。所以不管怎么样都有一句是能被匹配的。在上题中,他定义的第一句是拒绝到从192.168.15.32- 192.168.15.47发出的任何的telnet 的流量,然后第二句定义的就是允许所有的IP流量。而且要明确telnet的流量使用的是端口23,所以这个题的答案就很明确了。
转载请注明原文地址:https://kaotiyun.com/show/JZhZ777K
本试题收录于:
思科640802题库思科认证分类
0
思科640802
思科认证
相关试题推荐
Theymaynotbetherichest,butAfricansremaintheworld’sstaunchestoptimists.AnannualsurveybyGallupInternational,ar
Writeanessayof160-200wordsbasedonthefollowingdrawing.Inyouressay,youshould1.describethedrawingbriefly,2.s
Writeanessaybasedonthefollowingdiagram.Inyourwritingyoushould1)describethediagramand2)giveyourcomments.Yo
Thatsomepeoplemakeweirdassociationsbetweenthesenseshasbeenacknowledgedforoveracentury.Theconditionhasevenbee
[A]Mentalandemotionalissues[B]Higherrisksofcontractingchronicdiseases[C]Physicalhealth[D]CyberSpace
WritealettertoinviteProf.Browntotakepartinaseminarheldbyyourcollege.Youshouldincludethedetailsyouthinkne
WhenyouusethepingcommandtosendICMPmessagesacrossanetwork,what’sthemostcommonrequest/replypairyou’llsee?(Sel
WhichofthefollowingareVLANframeencapsulationtypesthatmaybeconfiguredonaCatalystswitch?(Choosetwo.)A.VTPB.I
WhichtwoarefeaturesofIPv6?
Aroutingprotocolisrequiredthatsupports:1)routingupdateauthentication2)anaddressingschemethatconservesIPaddre
随机试题
急性胰腺炎的发病原因在中国主要是
急性链球菌感染后肾小球肾炎时,与肾小球滤过率降低无关的是()
洞式渗沟填料顶面宜高于地下水位。洞式渗沟顶部必须设置( )。
关于《报检员证》的表述,正确的有( )。
中国公民王先生是境内某公司的员工,同时也是一位作家。2014年5月取得的收入如下:(1)将本人一部长篇小说手稿的著作权拍卖取得收入5万元,同时拍卖一幅名人书法作品取得收入35万元。经税务机关确认,所拍卖的书法作品原值及相关费用为20万元。
2002年2月,三部委联合出台的关于个人教育贷款的“四定三考核”政策,定的是()。
下面属于生产性采购的是()。
后羿
Amtrak—thelargestrailwaycompanyintheU.S.—wasexperiencingadownswinginridership.【C1】______majorconcernstoAmtrakand
Asmostparentsofsmallchildrenwillreluctantlyadmit,nothingcanoccupyachildquiteliketelevision.【C1】______,thescient
最新回复
(
0
)