6.5 - Chapter Quiz 6.5.1 - Quiz Diagram 1, Quiz Chapter 6 Quiz: Routing with a Link-State Protocol 1. What attribute is associated with link-state routing protocols? A. Split horizon B. Poison reverse C. Low processor overhead D. Shortest-path first calculations 2. Refer to the exhibit. If OSPF is configured in the network using the costs shown in the table, which path will a packet taken from H1 to H2? H1 is connected via Ethernet cable to R1. R1 is connected via Ethernet cable to R2. R2 is connected via T1 serial connection to R5. R1 is also connected via Ethernet cable to R5. R1 is also connected via T1 serial connection to R4. R4 is connected via GigEthernet to R5. R1 is also connected via T3 serial connection to R3. R3 is connected via FastEthernet to R4. Finally R5 is connected via Ethernet to H2. Table of costs: GigEthernet = 1 FastEthernet = 10 T3 = 20 Ethernet = 100 T1 = 800 A. R1 ? R5 B. R1 - R2 - R5 C. R1 - R4 - R5 D. R1 - R3 - R4 - R5 3. Refer to the exhibit. The router learned three different routes to the subnet 192.168.1.0. What action will the router take to forward a packet to the destination of 192.168.1.143? Destination IP address: 192.168.1.143 Learned Routes: O 192.168.1.0/24 (110/65) via 192.168.2.2, 00:00:05, Serial 0/0/0 R 192.168.1.0/24 (120/1) via 192.168.3.2, 00:00:05, FastEthernet 0/0 D 192.168.1.0/24 (90/21765) via 192.168.4.2, 00:00:05, Serial 0/0/1 A. The packet will be dropped by the router. B. The packet will be load-balanced across the three routes. C. The packet will be forwarded to the next hop of 192.168.4.2. D. The packet will exit the router through the FastEthernet 0/0 interface. 4. Refer to the exhibit, which shows partial output from the show running-config command on RouterA. With all interfaces on RouterA active, the network administrator modifies the configuration of the router by issuing the command no router-id 18.20.20.172. The configuration is then saved and the router restared. What will be the router ID for RouterA when OSPF is re-established? RouterA#show running-config interface Loopback0 ip address 192.168.30.1 255.255.255.0 ! interface Loopback1 ip address 192.168.70.18 255.255.255.252 ! interface FAstEthernet0/0 ip address 192.168.102.1 255.255.255.0 ! interface FAstEthernet0/1 ip address 192.168.90.1 255.255.255.0 ! interface Serial0/0/0 ip address 172.20.20.18 255.255.255.252 ! Router ospf 100 Router-id 18.20.20.172 A. 10.190.102.1 B. 172.20.20.18 C. 192.168.30.1 D. 192.168.70.18 E. 192.168.90.1 5. Refer to the exhibit. RouterA, RouterB and RouterC in the diagram are running OSPF on their Ethernet interfaces. Router D was just added to the network. Routers are configured with the loopback interfaces (Lo 0) that are shown in the exhibit. What happens to the OSPF DR/BDR after RouterD is added to the network? A switch at the core of a star topology connected to router A, B, C and D. Router A is connected to the core switch via Fa0/0 with the IP address 172.16.5.1/24. The line out from router A is address 172.16.4.3/32. Router B is connected to the core switch via Fa0/0 with the IP address 172.16.5.2/24. The line out from router B is address 172.16.4.2/32. Router C is connected to the core switch via Fa0/0 with the IP address 172.16.5.3/24. The line out from router C is address 172.16.4.1/32. Router D is connected to the core switch via Fa0/0 with the IP address 172.16.5.4/24. The line out from router D is address 172.16.4.4/32. A. RouterB takes over as DR and RouterD becomes the BDR. B. RouterD becomes the BDR and Router A remains the DR. C. RouterD becomes the DR and Router A remains the BDR. D. RouterC acts as the DR until election process is complete. E. RouterD becomes the DR and RouterB remains the BDR. F. There is no change in the DR and BDR until either current DR or BDR goes down. 6. Refer to the exhibit. What network commands will configure router A to properly advertise the OSPF routes? Router A is connected to a LAN addressed 192.168.10.64/26. It is also connected to router B the connection between them is192.168.10.192/30. Router B is connected to a LAN addressed 192.168.10.128/2. This network is part of OSPF Area 0. A: Network 192.168.10.0 0.0.0.63 area 0 network 192.168.10.128 0.0.0.63 area 0 B: Network 192.168.10.64 0.0.0.63 area 0 network 192.168.10.192 0.0.0.3 area 0 C: Network 192.168.10.0 255.255.255.252 area 0 network 192.168.10.128 255.255.255.252 area 0 D: Network 192.168.10.64 255.255.255.252 area 0 network 192.168.10.192 255.255.255.252 area 0 7. Which two statements are true regarding the cost calculation for a link in OSPF? (Choose two.) A. It can be set with the ip ospf cost command. B. It is set to 1544 by default for all OSPF interfaces. C. The configures loopback addresses map to link costs. D. It may be calculated using the formula reference bandwidth/bandwidth. E. It is calculated proportionally to observed throughput capacity of the router. 8. Refer to the Exhibit. OSPF routing protocol is configured for the routers, however, routerA is not receiving any OSPF routed from the other routers. Based on the information in the exhibit, what is the problem with the router A configuration? Router A is connected to a LAN with the address 192.168.10.64/26. Router A is connected to Router B, the serial link between them is 192.168.10.0/30. Router B is connected to a LAN with the address 192.168.10.128/26. Router B is connected to Router C, the serial link between them is 192.168.10.4/30. Router C is connected to a LAN on the address 192.168.10.192/26. A#show ip protocols Routing Protocol is ?ospf 1? Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set Router ID 192.168.10.65 Number of areas in this router is 1. 1normal 0 stub 0 nssa Maximum path: 4 192.168.10.64 0.0.0.63 area 0 192.168.10.128 0.0.0.63 area 0 Routing Information Sources: Gateway Distance Last Update 192.168.10.65 110 00:00:28 Distance: (default is 110) A. None of the interfaces are enabled. B. OSPF has an improper process ID. C. One of the network statements is wrong. D. Auto-summarisation needs to be disabled. 9. Refer to the exhibit. A network administrator is implementing OSPF between headquarters and multiple branch offices. All branch offices are connected to the Internet through the headquarters router. What effect will the commands entered o0n the headquarters? router have? Router HQ has a serial link to the Internet. HQ has serial links to routers North, South, east and West. HQ(config)#ip route 0.0.0.0 0.0.0.0 serial 1/0 HQ(config)#ip router ospf 1 HQ(config-router)#default-information originate HQ(config)#exit A. The command will only affect the local router. B. The command must be applied to all routers in order for the default route to be propagated. C. The default will be propagated to all routers participating in the same OSPF area. D. The default route will only be learned by the OSPF adjacent neighbours. 10. For which two reasons would a network administrator choose to enable authentication for OSPF exchanges? (Choose two.) A. To prevent routing information from being falsified B. To reduce OSPF information exchange overhead C. To keep routing information being captured D. To encrypt routing tables to prevent unauthorised viewing E. To ensure the OSPF routing information takes priority over RIP and EIGRP updates.