Chapter 8 Quiz – OSPF (Answers) CCNPv 8 Encor PDF

Preview

Summary

CCNP Enterprise ENCOR v8...

Description

1. What are two characteristics of OSPF areas? (Choose two.)  Area 0 is called the backbone area.  Al l OSPFnet wor ksr equi r et heuseofmul t i pl ear eas .  OSPFar easc r eat eat hr eel ay erhi er ar c hi c al des i gn.  All OSPF areas must be directly connected to Area 0.  Si ngl ear eaOSPFnet wor k smus tbec onfi gur edi nAr ea1.  Eac hOSPFar eamustbeconfi gur edwi t hal oopbacki nt er f ace. Explanation: OSPFi sdes i gnedwi t hahi er ar c hi cal ar c hi t ec t ur eus i ngt heconceptofar eas .Anar eai s ac ol l ect i onofc onnec t ednet wor k sandi si dent i fi edwi t ht henetwork c ommand.Ar ea0i sas pec i al ar ea k nownast heback bone.Al l ot herar easmus tconnectt oAr ea0. 2. Which statement is true about OSPF DR and BDR elections?  AnewDR/ BDRel ect i onocc ur seac ht i meanewOSPFnei ghbori sadded.  The router with the highest OSPF priority setting wins the election for DR.  Thedef aul tpr i or i t yv al uef orar out erc onnect edt oamul t i ac cessnet wor ki s0.  Ther out erwi t ht hehi ghes tMACaddr es si sel ect edast heDRwhent hedef aul tpr i or i t yv al uesar e us ed. Explanation: Thedef aul tOSPFpr i or i t yi sv al ue1butcanbec onfi gur edf r om 1t o255.Ther out erwi t h t hehi ghes tpr i or i t ywi l l wi nt heOSPFDRel ect i on. 3. Which OSPF network type requires the election of a DR/BDR?  broadcast  poi nt t opoi nt  poi nt t omul t i poi nt  poi nt t omul t i poi ntnonbr oadc as t Explanation: OSPFr out er sel ectaDRandaBDRonmut l i acc es sbr oadc astnet wor k s . 4. Which two Layer 2 multicast addresses are used for Layer 2 frames carrying OSPF messages? (Choose two.)  01:00:5E:00:00:06  01:00:5E:00:00:05  01: 00: 5E: 00: 00: 0A  01: 00: 5E: 00: 00: 02  01: 00: 5E: 00: 00: 0F Explanation: 01: 00: 5E: 00: 00: 05i st hemul t i c as tMACaddr essus edt or eac hal l OSPFr out er sand 01: 00: 5E: 00: 00: 06i st hemul t i c astMACaddr essus edt or eac hOSPFDRs . 5. Which OSPF neighbor state indicates that bidirectional communication has been established prior to LSDB synchronization? I ni t  2-Way  Loadi ng  Ful l Explanation: WhenanOSPFi nt er f ac ehasr ecei v edHel l opack et sf r om anot herOSPFr out er ,i t t r ansi t i onst ot he2Ways t at e.LSDBs y nc hr oni z at i ondoesnotbegi nunt i laf t ert he2Wa yst at e. 6. A router with two LAN interfaces, two WAN interfaces, and one configured loopback interface is operating with OSPF as its routing protocol. What does the router OSPF process use to assign the router ID? t heI Paddr essoft hei nt er f acet hati sc onfigur edwi t hpr i or i t y0 t heOSPFar eaI Dt hati sconfigur edont hei nt er f ac ewi t ht hehi ghes tI Paddr es s  the loopback interface IP address t hehi ghes tI Paddr essont heLANi nt er f aces t hehi ghes tI Paddr esst hati sconfigur edont heWANi nt er f ac es Explanation: OSPFr equi r esauni quer out erI Doneac hr out er .Ther out erI Dc anbec onfi gur ed ft hi sc ommandi snoti s sued,t hent heOSPFpr oces swi l l us e manual l ywi t ht he#router-id command.I

t hehi ghes tI Pv 4addr es sonanact i v ei nt er f ac east her out erI D,wi t hpr ef er enc egi v et ol oopback i nt er f aces . 7. Which IP protocol number is reserved for OSPF by the IANA? 6  88  89  112 Explanation: I Ppr ot ocol number sar ef oundi nt het hePr ot oc ol fi el doft heI Pv 4headerandt heNex t Headerfiel doft heI Pv 6header .Thepr ot ocol numberf orOSPFi s89 8. Refer to the exhibit. R1 is configured properly for a single area OSPF, and R2 has been recently installed in the network. Which set of commands is required to configure a single area OSPF for the networks that are connected to R2?

 R2(config)# router ospf 1 R2(config-router)# network 192.168.2.0 0.0.0.255 area 0 R2(config-router)# network 10.1.1.0 0.0.0.3 area 0  R2( config) #r out eros pf1 R2( configr out er ) #net wor k192. 168. 2. 00. 0. 0. 255ar ea0 R2( config) #r out eros pf2 R2( configr out er ) #net wor k10. 1. 1. 00. 0. 0. 3ar ea0  R2( config) #r out eros pf1 R2( configr out er ) #net wor k192. 168. 2. 00. 0. 0. 255ar ea0 R2( configr out er ) #net wor k10. 1. 1. 00. 0. 0. 3ar ea1  R2( config) #r out eros pf1 R2( configr out er ) #net wor k192. 168. 2. 00. 0. 0. 255ar ea0 R2( configr out er ) #net wor k10. 0. 0. 00. 0. 0. 3ar ea1 Explanation: Toconfigur eR2f orOSPFi nar ea0fi r stenabl eOSPFwi t ht herouter ospf 1c ommand.Thenappl yOSPFt ot heser i al andLANi nt er f aceswi t ht henetwork 192.168.2.0 ommands . 0.0.0.255 area 0 andnetwork 10.1.1.0 0.0.0.3 area 0 c 9. A network administrator is implementing OSPF in a portion of the network and must ensure that only specific routes are advertised via OSPF. Which network statement would configure the OSPF process for networks 192.168.4.0, 192.168.5.0, 192.168.6.0, and 192.168.7.0, now located in the backbone area, and inject them into the OSPF domain?  r1(config-router)# network 192.168.4.0 0.0.3.255 area 0 r 1( confi gr out er ) #net wor k192. 168. 4. 00. 0. 3. 255ar ea1 r 1( confi gr out er ) #net wor k192. 168. 4. 00. 0. 15. 255ar ea1 r 1( confi gr out er ) #net wor k192. 168. 0. 00. 0. 3. 255ar ea0 r 1( confi gr out er ) #net wor k192. 168. 0. 00. 0. 15. 255ar ea1 r 1( confi gr out er ) #net wor k192. 168. 4. 00. 0. 15. 255ar ea0

Explanation: Thenetwork 192.168.4.0 0.0.3.255 area 0 c ommandhast hec or r ectnet wor k andwi l dc ar dmas kc ombi nat i ont ocapt ur et hef ournet wor k sandact i v at et heass oci at edi nt er f ac esf or ar ea0. 10. How does OSPF exchange routing updates when the passiveinterface command is applied?  OSPFf or msnei ghboradj ac enci esont hati nt er f ace.  TheOSPFi nt er f ac eent er sanact i v es t at e.  OSPFst opss endi ngr out i ngupdat esoutt hati nt er f ace.  OSPFonl yr ec ei v esr out i ngupdat esont hati nt er f ace.  OSPF neither sends nor receives routing updates through that interface. Explanation: Whent hepass i v ei nt er f ac ecommandi sappl i ed,t hei nt er f acedoesnots endoutany OSPFhel l omess agesnorwi l l i tpr oces sanyr ec ei v edOSPFpack et s . 11. Refer to the exhibit. An administrator has entered the commands shown on R1. However, the default route is not propagating to other OSPF routers. What configuration would likely correct this problem?

 Changet headmi ni s t r at i v edi s t anc eont hes t at i cr out et ol es st hant hatofOSPF.  Issue the default-information originate command. I s s uet heredistribute static c ommand.  Us et henetwork commandt oputnet wor k0. 0. 0. 0/ 0i nt oar ea0. Explanation: Thedef aul t i nf or mat i onor i gi nat ec ommandi sus edt opr opagat eadef aul tr out et oOSPF nei ghbor s . 12. What is the OSPF link cost of a Gigabit Ethernet interface if the reference bandwidth is configured as 10000 Mbps? 1  10  100  1000 Explanation: Thef or mul af orc al cul at i ngcosti sCost=Ref er enc eBandwi dt hi nMbps / I nt er f ac e Bandwi dt hi nMbps .SoCos t=10000/ 1000or10....