依次填入下面一段文字横线处的语句，衔接最恰当的一项是：标点是辅助文字记录语言的符号。是书面语

A.Thedesignatedportistheswitchportoneverynonrootbridgethatisthechosenpathtotherootbridge.Therecanbeonlyonedesignatedportoneveryswitch.Thedesignatedportassumestheforwardingstateinastableactivetopology.AllswitchesconnectedtoagivensegmentlistentoallBPDUsanddeterminetheswitchthatwillbetherootswitchforaparticularsegment.

B.Thedisabledportisanadditionalswitchportonthedesignatedswitchwitharedundantlinktothesegmentforwhichtheswitchisdesignated.AdisabledporthasahigherportIDthanthedisabledportonthedesignatedswitch.Thedisabledportassumesthediscardingstateinastableactivetopology.

C.Thebackupportisaswitchportthatoffersanalternatepathtowardtherootbridge.Thebackupportassumesadiscardingstateinastable，activetopology.Thebackupportwillbepresentonnondesignatedswitchesandwillmakeatransitiontoadesignatedportifthecurrentdesignatedpathfails.

D.Therootportistheswitchportoneverynonrootbridgethatisthechosenpathtotherootbridge.Therecanbeonlyonerootportoneveryswitch.Therootportassumestheforwardingstateinastableactivetopology.

) and area 1. In this internetwork, area 0 contains all the subnets of cla ss A network 10.0.0.0. R1‘s OSPF process has a distribute - list prefix question in command configured. Assuming 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 subnet 10.1.2.0/26 into area 1

B. R1 will not create/flood a Type 3 LSA for subnet 1 0.1.2.0/24 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

A.SwitchSW1hasbeenconfiguredwiththespanning-treevlan1rootprimaryglobalconfigurationcommand.

B.SwitchSW1hasbeenconfiguredwiththespanning-treevlan1rootsecondaryglobalconfigurationcommand.

C.SwitchSW1hasbeenconfiguredwiththespanning-treevlan1priority24577globalconfigurationcommand.

D.SwitchSW1hasbeenconfiguredwiththespanning-treevlan1hello-time2globalconfigurationcommand.

E.Therootbridgehasbeenconfiguredwiththespanning-treevlan1rootsecondaryglobalconfigurationcommand.

A.Theyhavebeenconfiguredwiththespanning-treebpdufilterdisablecommand.

B.Theyhavebeenconfiguredwiththespanning-treebpdufilterenablecommand.

C.Theyhavebeenconfiguredwiththespanning-treebpduguarddisablecommand.

D.Theyhavebeenconfiguredwiththespanning-treebpduguardenablecommand.

E.Theyhavebeenconfiguredwiththespanning-treeguardloopcommand.

F.Theyhavebeenconfiguredwiththespanning-treeguardrootcommand.

connected to area 1 are performing Type 3 LSA filterinG. Which of the following answers is true based on the information in the output from B1?（）R1 show ip route 10.1.0.0 255.255.0.0 longer - prefixes! Legend lines omitted for brevity10.0.0.0/8 is variably subnetted, 17 subnets, 3 masksO 10.1.2.0/24 [110/658] via 10.10.13.1, 00:00:32, Serial0/0/0.1O IA 10.1.1.0/24 [110/658] via 10.10.23.2, 00:41:39, Ser ial0/0/0.2O IA 10.1.3.0/24 [110/658] via 10.10.23.2, 00:41:39, Serial0/0/0.2

A. A Type 3 LSA for 10.2.2.0/24 was filtered by both ABRs

B. A Type 3 LSA for 10.1.2.0/24 was not filtered by both ABRs

C. A Type 3 LSA for 10.1.3.0/24 was not filtered by at least one ABR

D. A Type 3 LSA for 10.1.1.0/24 filtered by both ABRs

VLAN.Toreducethebroadcastdomain，thenetworkadministratordecidestosplitusersonthenetworkintoVLAN2andVLAN10.Theadministratorissuesthecommandspanning-treevlan2rootprimaryonswitchSW_A.Whatwillhappenasaresultofthischange？（）

A.AllportsoftherootswitchSW_Awillremaininforwardingmodethroughoutthereconvergenceofthespanningtreedomain.

B.SwitchSW_AwillchangeitsspanningtreeprioritytobecomerootforVLAN2only.

C.SwitchSW_AwillremainrootforthedefaultVLANandwillbecomerootforVLAN2.

D.NootherswitchinthenetworkwillbeabletobecomerootaslongasswitchSW_Aisupandrunning.

A. 1

B. 2

C. 3

D. 4

E. 5

F. 7

bandwidth commands have been configured in this router. Which of the following answers lists configuration settings could be a part of a configuration tha t results in the following output?（）R3show ip ospf interface briefInterface PID Area IP Address/Mask Cost State Nbrs F/CSe0/0/0.2 3 34 10.10.23.3/29 647 P2P 1/1Se0/0/0.1 3 34 10.10.13.3/29 1000 P2P 1/1Fa0/0 3 34 10.10.34.3/24 20 BDR 1/1

A. An a uto - cost reference - bandwidth 1000 command in router ospf mode

B. An auto - cost reference - bandwidth 2000 command in router ospf mode

C. An ip ospf cost 1000 interface S0/0/0.1 command in router ospf mode

D. An auto - cost reference - bandwidth 64700 command i n router ospf mode

A.Thecommandwillberejectedbytheswitch.

B.InterfacesFastEthernet0/13andFastEthernet0/14willnolongerbebundled.

C.DynamicTrunkingProtocolwillbeturnedoffoninterfacesFastEthernet0/13andFastEthernet0/14.

D.InterfacesFastEthernet0/13andFastEthernet0/14willonlyallowtrafficfromthenativeVLAN.

E.InterfacesFastEthernet0/13andFastEthernet0/14willcontinuetopasstrafficforVLANs88，100，360.

A.Allsecureaddresseswillageoutandberemovedfromthesecureaddresslist.Thiswillcausethesecurityviolationcountertoincrement.

B.Thefirstaddresslearnedontheportwillberemovedfromthesecureaddresslistandbereplacedwiththenewaddress.

C.Theinterfacewillbeplacedintotheerror-disabledstateimmediately，andanSNMPtrapnotificationwillbesent.

D.ThepacketswiththenewsourceaddresseswillbedroppeduntilasufficientnumberofsecureMACaddressesareremovedfromthesecureaddresslist.