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Cisco IOS Access List
by Dr James Pattrick
->->->-> http://shurll.com/6r68h DOWNLOAD BOOK
Cisco routers are used widely both on the Internet and in corporate intranets. At the same time, the Cisco Internet Operating System (IOS) has grown to be very large and complex, and Cisco documentation fills several volumes.Cisco IOS Access Lists focuses on a critical aspect of the Cisco IOS--access lists. Access lists are central to the task of securing routers and networks, and administrators cannot implement access control policies or traffic routing policies without them. Access lists are used to specify both the targets of network policies and the policies themselves. They specify packet filtering for firewalls all over the Internet.Cisco IOS Access Lists covers three critical areas:
Details:
Price: $43.99
bound: 232 pages
Publisher: CreateSpace Independent Publishing Platform (May 11, 2017)
Language: English
ISBN-10: 1546818901
ISBN-13: 978-1546818908
Weight: 1.5 pounds
A..single-entry..ACL..with..only..one..deny..entry..has..the..effect..of..denying..all..trafficend...9If.the.order.of.the.entries.is.reversed.as.this.command.shows,.the.first.line.matches.every.packet.source.addressThe..implicit..deny..all..clause..at..the..end..of..an..ACL..denies..all..other..traffic,..which..does..not..match..the..permit..clausesIn..other..words,..the..ACL..really..looks..like..this:Any..number..of..addresses..can..be..configured..into..the..system..without..a..performance..penalty
In..general,..most..protocols..require..at..least..two..basic..steps..to..be..accomplishedIf..the..source-wildcard..or..destination-wildcard..is..omitted,..a..wildcard..mask..of..0.0.0.0..is..assumed,..meaning..match..on..all..bits..of..the..source..or..destination..address,..respectively..Step3..ip..access-list..standard..name..Example:..Device(config)#..ip..access-list..standard..R&D....Defines..a..standard..IP..access..list..using..a..name..and..enters..standard..named..access..list..configuration..modeA...single...access...list...can...have...multiple...filtering...criteria...statementsWhether..you..see..the..statement..or..not,..the..router..denies..all..traffic..that..doesn't..meet..a..condition..in..the..ACLThe.access.list.itself.is.the.first.thing.that.is.configured;.in.this.example.the.access.list.number.10.will.be.usedLock..and..key..has..bothThis...list...describes...how...to...summarize...a...range...of...networks...into...a...single...network...for...ACL...optimization
end..DETAILED..STEPSCommand..or..ActionPurposeStep1..enable..Example:..Device>..enable....Enables..privileged..EXEC..modeIf.the.source-wildcard.is.omitted,.a.wildcard.mask.of.0.0.0.0.is.assumed,.meaning.match.on.all.bits.of.the.source.addressHow..to..create..and..bind..an..access..list..on..a..Cisco..switch..Published..in..:..2015-06-02....by..Robert..McMillen..Author,..teacher,..and..talk..show..host..Robert..McMillen..shows..you..how..to..how..to..create..and..bind..an..access..list..on..a..Cisco..switchThe...connection...is...then...dropped,...and...the...user...can...go...to...the...172.16.1.x...network..Step8..Repeat..some..combination..of..Steps..4..through..7..until..you..have..specified..the..sources..on..which..you..want..to..base..your..access..listWhen...it...has...worked...its...way...through...the...list,...the...processing...stops.Step6.remark.remark.Example:.Device(config-std-nacl)#.remark.Give.access.to.Testers.host..(Optional).Adds.a.user-friendly.comment.about.an.access.list.entryStandard..ACLscompare..the..source..address..of..the..IP..packets..to..the..addresses..configured..in..the..ACL..in..order..to..control..traffic
router(config-ext-nacl)#permit.gre.host.4.4.4.4.host.8.8.8.8.router(config-ext-nacl)#^Z.1d00h:.%SYS-5-CONFIGI:.Configured.from.console.by.consoles-l.router#show.access-list.Extended.IP.access.list.test.permit.ip.host.2.2.2.2.host.3.3.3.3.permit.tcp.host.1.1.1.1.host.5.5.5.5.eq.www.permit.udp.host.6.6.6.6.10.10.10.0.0.0.0.255.eq.domain.permit.gre.host.4.4.4.4.host.8.8.8.8.You.can.also.add.ACL.lines.to.numbered.standard.or.numbered.extended.ACLs.by.sequence.number.in.Cisco.IOSMy..question..is..how..can..I..get..previous..LAB..questions?..anyone..knows..please?..Thank..kindlyThis..chapter..includes..tips,..cautions,..considerations,..recommendations,..and..general..guidelines..for..how..to..use..access..listsAuthentication.proxy.has.an.absolute.timeout.but.no.idle.timeout..Step7..end..Example:..Device(config-ext-nacl)#..end....Exits..standard..named..access..list..configuration..mode..and..enters..privileged..EXEC..mode 07f867cfac
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