Cisco CCNA–Rip Questions


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Cisco CCNA–Rip Questions

  1. 1. CiscoCCNA–RIP QuestionsHere you will find answers to RIP QuestionsNote: If you are not sure about RIP, please read the RIP tutorial.Question 1Which statement about RIPng is true?A. RIPng allows for routes with up to 30 hops.B. RIPng is enabled on each interface separately.C. RIPng uses broadcasts to exchange routes.D. There can be only one RIPng process per router.Answer: BExplanationRIPng is similar to RIPv2 but is used for IPv6. But unlike RIPv1 and RIPv2, RIPng isenabled on each interface separately. For example:Router(config)#ipv6 unicast-routing (Enables the forwarding of IPv6 unicastdatagrams globally on the router)Router(config)#interface fa0/0Router(config-if)#ipv6 rip 9tut enable (9tut is the process name of this RIPng)Question 2What are two characteristics of RIPv2? (Choose two)A. classful routing protocolB. variable-length subnet masksC. broadcast addressingD. manual route summarizationE. uses SPF algorithm to compute pathAnswer: B DQuestion 3Refer to the exhibit. Which (config-router) command will allow the networkrepresented on the interface to be advertised by RIP?router ripversion 2no auto summary!interface ethernet0ip address redistribute ethernet0B. network ethernet0C. redistribute network D
  2. 2. Question 4Refer to the exhibit. What information can be gathered from the output?RouterA#debugip ripRIP protocol debugging is on00:34:32: RIP: sending v2 flash update to viaFastEthernet8/0 ( RIP: build flash update entries00:34:32: via, metric 1, tag 000:34:32: RIP: sending v2 flash update to via Loopback ( RIP: build flash update entries00:34:32: via, metric 2, tag 000:34:32: via, metric 1, tag 000:34:32: RIP: ignored v2 packet from (sourced from one of our addresses)06:34:33: RIP: received v2 update from on FastEthernet0/666:34:33: via in 1 hops66:34:44: RIP: sending v2 update to via FastEthernet0/0 ( RIP: build update entries66:34:44: via, metric 1, tag 0A. One router is running RIPv1.B. RIP neighbor is The network contains a loop.D. Network is reachable.Answer: DQuestion 5Which series of commands will configure router R1 for LAN-to-LAN communicationwith router R2? The enterprise network address is and the routingprotocol in use isRIP. (Choose three)A.R1 (config)# interface ethernet 0R1 (config-if)# ip address (config-if)# no shutdownB.R1 (config)# interface ethernet 0R1(config-if)#ip address (config-if)# no shutdownC.
  3. 3. R1 (config)# interface serial 0R1 (config-if)# ip address (config-if)# clock rate 56000D.R1 (config)# interface serial 0R1(config-if)#ip address (config-it)# no shutdownE.R1 (config)# router ripR1 (config-router)# network (config-router)# network (config)# router ripR1 (config-router)# version 2R1 (config-router)# network A D FExplanationFirst we notice that the ip address of the E0 interface of R2 is, whichhas:Increment: 64 (/26 = 1111 1111.1111 1111.1111 1111.1100 0000)Network address: address:, the ip address of the E0 interface of R1 cannot belong to this range or thenetwork cannot operate correctly.In answer A, the ip address of E0 interface of R1 is, which does notbelong in this range -> A is correct.In answer B, E0 interface of R1 has the ip address of, which belongs in thisrange -> B is not correct.The s0 interface of R1 must belong to the same network of s0 interface of R2, whichhas:Increment: 4 (/30 = 1111 1111.1111 1111.1111 1111.1111 1100)Network address: address: ip has been used by s0 of R2 so the only suitable ip address of s0 of R1is -> C is wrong but D is correct.Now the last thing we must do is enabling RIP. Because e0 interface of R1 and e0interface of R2 have the same major network ( so we must use RIPversion 2 to support discontiguous network -> F is correct.For answer E, if we configure 2 networksR1 (config-router)# network (config-router)# network these networks will be automatically summarized as network.Question 6
  4. 4. Refer to the exhibit. Two routers have just been configured by a new technician. Allinterfaces are up. However, the routers are not sharing their routing tables. What isthe problem?A. Split horizon is preventing Router2 from receiving routing information fromRouter1.B. Router1 is configured for RIP version 2, and Router2 is configured for RIP version 1.C. Router1 has an ACL that is blocking RIP version 2.D. There is a physical connectivity problem between Router1 and Router2.E. Router1 is using authentication and Router2 is not.Answer: BExplanationAs we can see from the output, Router2 is sending v1 update and ignoring v2 updatefrom neighbor so we can conclude Router2 is running RIPv1. Its neighbor, Router1 (ipaddress of, is running RIPv2.Notice that router running RIPv2 can “understand” RIPv1 update but router runningRIPv1 cannot understand RIPv2 update.Question 7What is the default routing update period for RIPv2?A. 15 secondsB. 30 SecondsC. 180 SecondsD. 240 SecondsAnswer: BQuestion 8Refer to the exhibit. The network manager is evaluating the efficiency of the currentnetwork design. RIPv2 is enabled on all Layer 3 devices in the network. Whatnetwork devices participate in passing traffic from the PC at to File Serverat in the order that they will forward traffic from source to destination?
  5. 5. A. Switch, Switch2B. Switch, Switch2, Router2, Switch2C. Switch1, Router1, Switch1, Switch2D. Switch1, Router1, Router2, Switch2Answer: DExplanationThe PC and File Server are in different VLANs so surely traffic from PC to File Servermust go through Router1 but which path will the packet go next, through Router 2 orSwitch1? Well, it is a hard question to answer.As many comments said “the connection between R1 and Switch is Blue, so thatmeans it’s under Vlan 10, and R2 to Switch 2 is red. The two routers do not havesubinterfaces and are not running router on a stick basing on the color of the links”so D should be the correct answer.Just for your information, I keep this explanation (which supports answer C) but inthe exam you should choose D as your answer!I haven’t had tested it yet but I guess that because there is a VLAN 20 on Switch 1 soRouter1 will try to send that packet back to Switch1. If the link between Switch1 andSwitch2 is a trunk link then the returned packet will also be sent to this link. Switch 2receives that packet and it sends to the File Server at VLAN20. So the path will beSwitch1 -> Router1 -> Switch1 -> Switch2.There are some debates about this question but if the routers are properlyconfigured then the packets can go from Switch1 -> Router1 -> Router2 -> Switch2 (Danswer) so D can be a correct answer.Question 9Refer to the exhibit. Router A has interfaces with addresses and172.16.1.1. Router B, which is connected to router A over a serial link, has interfaceswith address and
  6. 6. Which sequence of commands will configure RIPv2 on router B?A.B( config)# router ripB(config-router)#version 2B(config-router)# network network endB.B(config)# router rip 2B(config-router)# network network endC.B(config)# router ripB(config-router)#version 2B(config-router)# network router rip version 2B(config-router)# network network AQuestion 10Refer to the exhibit. S0/0 on R1 is configured as a multipoint interface tocommunicate with R2 and R3 in this hub-and-spoke Frame Relay topology.While testing this configuration, a technician notes that pings are successful fromhosts on the network to hosts on both the and172.16.2.128/25 networks. However, pings between hosts on the and172.16.2.128/25 networks are not successful. What could explain this connectivityproblem?
  7. 7. A. The ip subnet-zero command has been issued on the R1 router.B. the RIP v2 dynamic routing protocol cannot be used across a Frame Relay network.C. Split horizon is preventing R2 from learning about the R3 networks and R3 fromlearning about the R2 networks.D. The and networks are overlapping networks thatcan be seen by R1, but not between R2 and R3.E. The network used on the Frame Relay links is creating adiscontiguous network between the R2 and R3 router subnetworks.Answer: CExplanationThe “ip subnet-zero” allows the use of the first subnet but it doesn’t cause thisproblem and we don’t have that first subnet (like so we can’t confirmif the “ip subnet-zero” was used or not -> A is not correct.Frame-Relay can use RIPv2 with no problem if we configure it correctly -> B is notcorrect.In the exhibit above we notice that the s0/0 interface of R1 has not been divided intosub-interfaces so the split horizon will prevent updates from R2 to R3 and vice versa.The split horizon rule states “A router never sends information about a route back insame direction which is original information came”. In this case R2 send an update toS0/0 of R1 so R1 cannot send that update back on S0/0 -> R3 will not learn aboutnetworks of R2 (and vice versa) -> C is correct. and networks are not overlapping networks. They aretwo different sub-networks -> D is not correct.RIPv2 is a classless routing protocol so it supports VLSM and discontiguous networks-> E is not correct.Question 11Refer to the exhibit. After a RIP route is marked invalid on Router_1, how much timewill elapse before that route is removed from the routing table?Router_1# show ip protocols
  8. 8. Routing Protocol is “rip”Sending updates every 30 seconds, next due in 8 secondsInvalid after 180 seconds, hold down 180, flushed after 240Outgoing update filter list foe all interfaces is not setIncoming update filter list for all interfaces is not setRouter 1#A. 30 secondsB. 60 secondsC. 90 secondsD. 180 secondsE. 240 secondsAnswer: BExplanationThe question reads: After a RIP route marked invalid on Router_1, how much timewill elasped before that route is removed from the routing table.The word “REMOVED” in the question means “FLUSHED”Carefully look at the Router_1 show ip protocol output:Invalid is 180 secs.Flushed is 240secs.RIP route marked invalid (180secs.)Time elasped before route is removed (Flushed 240secs.)The difference is 60secs……..240-180=60. Actually is 180+60=240.Please notice that the invalid timer, hold down timer and flush timer start counting atthe same time.Question 12Refer to the graphic. Host 1 cannot receive packets from Host 2. Assuming that RIP v1is the routing protocol in use, what is wrong with the IP configuration informationshown? (Choose two)A. The fa0/1 interface of router R2 has been assigned a broadcast address.B. The fa0/1 network on router R2 overlaps with the LAN attached to R1.
  9. 9. C. Host 2 has been assigned the incorrect subnet mask.D. Host 1 has been configured with the subnet mask.E. Host 2 on router R2 is on a different subnet than its gateway.Answer: B CExplanationThe fa0/1 interface of R2 is assigned an IP address of It seems to bea broadcast address but it is not. If we calculate the range of this network we willunderstand why:Network 16 (/20 = 1111 1111.1111 1111.1111 0000.0000 0000)Network address: address:> is an usable host address -> A is not correct.The IP address of host 1 ( belongs to the range of interface fa0/1 on R2 asshown above -> B is correct.In the topology above, all subnet masks are /20 ( excepting the subnetmask of Host 2 ( so C can be incorrect.The subnet mask of Host 1 is, not -> D is not correct.Host 2 is not on a different subnet than its gateway even if the subnet mask255.255.252.0 is used. Let’s analyze the range of Host 2 network:Network 4Network address: address: gateway ( is still belongs to this range -> E is not correct.Note: In this question, C is the best suitable answer after eliminating A, D, E answers.But in fact Host 2 can ping its gateway because they are on the same subnet.Question 13What two things will a router do when running a distance vector routing protocol?(Choose two)A. Send periodic updates regardless of topology changes.B. Send entire routing table to all routers in the routing domain.C. Use the shortest-path algorithm to the determine best path.D. Update the routing table based on updates from their neighbors.E. Maintain the topology of the entire network in its database.Answer: A DQuestion 14
  10. 10. Use the output from the router shown in the graphic above to determine which ofthe following are correct. (Choose two)A. Router John uses a link-state routing protocol.B. Router John will receive routing updates on the Serial0/0 interface.C. Router John will receive routing updates on the Serial0/1 interface.D. Router John will send routing updates out the Serial0/0 interface.E. Router John will send routing updates out the FastEthernet0/0 interface.F. Router John will send routing updates out the Serial0/1 interface.Answer: B DQuestion 15What can be determined from the line of show ip route output shown in the exhibit?(Choose two)R [120/2] via,00:00:25, Serial0/1A. The next routing update can be expected in 35 seconds.B. The IP address is configured on S0/1.C. the IP address is configured on S0/1.D. This route is using the default administrative distance.E. The network is two hops away from this router.Answer: D EExplanationFrom the output, we can see 2 parameters [120/2]. The first is the administrativedistance of the routing protocol being used. In this case it is RIP (symbolized by theletter “R”). Because 120 is also the default administrative distance value of RIP -> D iscorrect.
  11. 11. In RIP, the metric is hop count so “2″ means the network is two hops(routers) away from this router.Question Guide from Related Cisco CCNA Topics:Routing Information Protocol & RIP ConfigurationIs Cisco Bothering With “Open” EIGRP?Networking Tutorial Goes to Basic PPP Configuration