The following command output was gathered from Router R1, an ABR between areas 0 （backbone

A.Thedesignatedportistheswitchportoneverynonrootbridgethatisthechosenpathtotherootbridge.Therecanbeonlyonedesignatedportoneveryswitch.Thedesignatedportassumestheforwardingstateinastableactivetopology.AllswitchesconnectedtoagivensegmentlistentoallBPDUsanddeterminetheswitchthatwillbetherootswitchforaparticularsegment.

B.Thedisabledportisanadditionalswitchportonthedesignatedswitchwitharedundantlinktothesegmentforwhichtheswitchisdesignated.AdisabledporthasahigherportIDthanthedisabledportonthedesignatedswitch.Thedisabledportassumesthediscardingstateinastableactivetopology.

C.Thebackupportisaswitchportthatoffersanalternatepathtowardtherootbridge.Thebackupportassumesadiscardingstateinastable，activetopology.Thebackupportwillbepresentonnondesignatedswitchesandwillmakeatransitiontoadesignatedportifthecurrentdesignatedpathfails.

D.Therootportistheswitchportoneverynonrootbridgethatisthechosenpathtotherootbridge.Therecanbeonlyonerootportoneveryswitch.Therootportassumestheforwardingstateinastableactivetopology.

A.SwitchesS1andS3willbeabletoexchangetrafficbutneitherwillbeabletoexchangetrafficwithSwitchS2

B.SwitchesS1，S2，andS3willbeabletopasstrafficbetweenthemselves.However，ifthereisatopologychange，SwitchS2willnotreceivenotificationofthechange.

C.SwitchesS1，S2，andS3willbeabletopasstrafficbetweenthemselves.

D.IEEE802.1DandIEEE802.1wareincompatible.Allthreeswitchesmustusethesamestandardornotrafficwillpassbetweenanyoftheswitches.

-list prefix question in command configured on R1,R1‘s OSPF process has an area 1 filter-list prefix question in commandconfigured. Again assuming that the subnets listed in the answers actually exist in area 0.Which of the following occurs on router R1?（）R1sh ip prefix - listip prefix - list question: 4 entriesseq 5 deny 10.1.2.0/24 ge 25 le 27seq 15 deny 10.2.0.0/16 ge 30 le 30seq 20 permit 0.0.0.0/0 le 32

A. R1 will not create/flood a type 3 LSA for su bnet 10.1.2.0/26 into area 1

B. R1 will not create/flood a Type 3 LSA for subnet 10.1.2.0/24 into area 1

C. R1 will not have an OSPF route for subnet 10.1.2.0/26 in its IP routing tablE

D. R1 will not have an OSPF route for subnet 10.1.2.0/24 in its IP routing tablE

1.0/24,10.1.2.0/24, and 10.1.3.0/24. These routes have metrics of 21, 22, and 23, respectively. An engineer then adds the area 0 r ange 10.1.0.0 255.255.0.0 command under the OSPF process of R1.Which of the following is true?（）

A. R1 loses and then re - establishes neighborships with all neighbors.

B. R1 no longer advertises 10.1.1.0/24 to neighbors into area 1.

C. R1 advertises a 1 0.1.0.0/16 route into area 1 with a metric of 23 (largest metric).

D. R1 advertises a 10.1.0.0/16 route into area 1 with metric of 21 (lowest metric).

A. The LSA was created by an ABR due to an area range command.

B. The LSA was created by an ASBR due to a summary - address command.

C. If cr eated by an area range command, the best metric for a subordinate subnet on that ABR must have been 11.

D. None of the other answers is correct.

A.RouterAisthemastervirtualrouter，andRouterBisthebackupvirtualrouter.WhenRouterAfails，RouterBwillbecomethemastervirtualrouter.WhenRouterArecovers，RouterBwillmaintaintheroleofmastervirtualrouter.

B.RouterAisthemastervirtualrouter，andRouterBisthebackupvirtualrouter.WhenRouterAfails，RouterBwillbecomethemastervirtualrouter.WhenRouterArecovers，itwillregainthemastervirtualrouterrole.

C.RouterBisthemastervirtualrouter，andRouterAisthebackupvirtualrouter.WhenRouterBfails，RouterAwillbecomethemastervirtualrouter.WhenRouterBrecovers，RouterAwillmaintaintheroleofmastervirtualrouter.

D.RouterBisthemastervirtualrouter，andRouterAisthebackupvirtualrouter.WhenRouterBfails，RouterAwillbecomethemastervirtualrouter.WhenRouterBrecovers，itwillregainthemastervirtualrouterrole.

ith a default - information originate command.Which of the following is true about the effects of this configuration command?（）

A. R1 will always create and flood a default route into the OSPF domain.

B. R1 will create and flood an LSA for prefix/length 0.0. 0.0/0 into the OSPF domain if R1‘s IP routing table has a route to 0.0.0.0/0.

C. R1 will set a flag on the LSA for the subnet between itself and one of the ISPs, noting this subnet as a default network, regardless of whether R1 has a default route.

D. R1 w ill set a flag on the LSA for the subnet between itself and one of the ISPs, noting this subnet as a default network, but only if R1 has a route to 0.0.0.0/0.

HSRPdeviceforVlan101asdesired.However，afterG1/0/1onDS1wasreactivated.DS1didnotbecometheactiveHSRPdeviceasdesired.WhatneedtobedonetomakethegroupforVlan101functionproperly？（）

A.EnablepreemptonDS1’sVlan101HSRPgroup

B.DisablepreemptonDS1’sVlan101HSRPgroup

C.DecreaseDS1’spriorityvalueforVlan101HSRPgrouptoavaluethatislessthanpriorityvalueconfiguredonDS2’sHSRPgroupforVlan101

D.DecreasethedecrementinthetrackcommandforDS1’sVlan101HSRPgrouptoavaluelessthanthevalueinthetrackcommandforDS2’sVlan101HSRPgroup.

A. Routers cannot redistribute external routes into the area.

B. Routers should have zero Type 3 LSAs in their LSDBs.

C. Routers should have zero Type 5 LSAs in their LSDBs.

D. Routers should learn default routes from the ABRs attached to the area.

A.OnDS1，disablepreempt

B.OnDS1，decreasethepriorityvaluetoavaluelessthan190andgreaterthan150

C.OnDS2，increasethepriorityvaluetoavaluegreater241andlessthan249

D.OnDS2，increasethedecrementvalueinthetrackcommandtoavaluegreaterthan10andlessthan50.