1,001 CCNA Questions: Chapter 20 RIP and OSPF
D. The BDR is used when the DR fails. The BDR is elected when the DR is elected, and it acts as a backup DR in case the DR fails.
What is the purpose of the BDR with OSPF? (A) The BDR informs routers of priorities. (B) The BDR contains fault tolerant links to head office. (C) The BDR contains fault tolerant links to a central network. (D) The BDR is used when the DR fails.
B. Version 2 RIPv2 is a classless routing protocol and supports VLSM.
Which RIP version supports VLSM? (A) Version 1 (B) Version 2 (C) Version 3 (D) Version 4
C. Cost OSPF uses cost as a metric.
Which of the following does OSPF use as a metric value? (A) Bandwidth (B) Hop count (C) Cost (D) Distance
B. no auto-summary RIPv2 automatically summarizes routes, and if you want to disable that feature you can use the no auto-summary command.
You have configured RIPv2 and you do not want it to auto summarize routes. What command would you use? (A) delete auto-summary (B) no auto-summary (C) negate summary (D) auto-summary stop
C. debug ip rip When troubleshooting any routing protocol, you can turn on debugging of that protocol. To enable debugging for rip, you would use the debug ip rip command.
After configuring RIP, you are not receiving any RIP entries in your routing table. What command could you use to verify you are receiving RIP updates? (A) show rip messages (B) show rip (C) debug ip rip (D) ip rip debug
B. Hello and Dead Interval timers are not configured the same on both routers. D. The routers are in different areas. In order for two OSPF routers to create neighboring relations, they must have the same configuration values for the Hello and Dead Interval values. They also must be configured for the same area.
What are two reasons why two OSPF routers would not be able to create neighbor relationships? (Select two.) (A) The router IDs are different. (B) Hello and Dead Interval timers are not configured the same on both routers. (C) The routers are in the same area. (D) The routers are in different areas. (E) There is no loopback interface configured on each router.
B. router ospf 1 C. network 192.168.5.0 0.0.0.255 area 0 In order to configure OSPF, you must first use the router ospf <process ID> command. You then specify the networks you wish to enable OSPF on along with the area you are assigning to that network.
What commands would you use to configure OSPF and add network 192.168.5.0/24 to area 0? (Select two.) (A) router ospf area 0 (B) router ospf 1 (C) network 192.168.5.0 0.0.0.255 area 0 (D) network 192.168.5.0 255.255.255.0 (E) network 192.168.5.0 0.0.0.255
A. The BDR becomes the DR and an election for a new BDR occurs. When the DR fails on the network, the backup designated router (BDR) becomes the DR and a new BDR is elected.
What happens when the DR fails? (A) The BDR becomes the DR and an election for a new BDR occurs. (B) A new DR is elected. (C) The router ID is changed. (D) The priority of the OSPF router is set to 0.
B. 120 RIP has an administrative distance of 120.
What is the administrative distance of RIP? (A) 90 (B) 120 (C) 110 (D) 1
C. 110 OSPF has an administrative distance of 110.
What is the default administrative distance of routes learned with OSPF? (A) 90 (B) 120 (C) 110 (D) 1
C. 4 OSPF will load balance between equal cost routes to the same destination. You can have a maximum of 4 equal cost routes to a destination.
What is the maximum number of equal cost routes that can exist in the routing table with OSPF? (A) 1 (B) 2 (C) 4 (D) 8
D. All other routers exchange info with the DR to cut down on bandwidth usage. The designated router is a router that shares routing information with other routers. Routers on the network share their routing information with the DR and then the DR informs all other routers. This prevents each router from needing to share routing information with all other routers.
What is the purpose of a Designated Router (DR) with OSPF? (A) It acts as a backup if the BDR fails. (B) It assigns IP addresses to clients on the network. (C) It converts private addresses to public addresses. (D) All other routers exchange info with the DR to cut down on bandwidth usage.
B. The router with the highest router ID If the OSPF priority is the same on each router, then the DR is selected based on the router with the highest router ID. The highest router ID is first selected by the highest IP address assigned to a loopback interface. If there are no loopback interfaces then the router ID is the highest IP address assigned to a physical interface.
When the OSPF priorities on all the routers are the same, how is the DR selected? (A) The router with the lowest router ID (B) The router with the highest router ID (C) The router with the priority set to 0 (D) One is randomly selected.
B. Area 0 Area 0 is the identity of the backbone area and all other areas in your autonomous system connect to it.
Which of the following areas is considered the "backbone" area with OSPF? (A) Area 1 (B) Area 0 (C) Area 2 (D) Area 10
A. Use the following commands: R1(config)#router rip R1(config-router)#distance 44 You can change the administrative distance for RIP by navigating to the router prompt and using the distance command.
Which of the following commands would you use to change the administrative distance with RIP? (A) Use the following commands: R1(config)#router rip R1(config-router)#distance 44 (B) Use the following commands: R1(config)#router eigrp R1(config-router)#distance 44 (C) Use the following commands: R1#router rip R1#distance 44 (D) Use the following command: R1(config)#distance 44
C. RIPv2 sends updates using multicast communication E. RIPv2 supports authentication. RIPv2 sends routing updates to a multicast address while RIPv1 broadcasts the address. RIPv2 also supports authentication, whereas RIPv1 does not.
Which of the following identifies differences between RIPv1 and RIPv2? (Select two.) (A) RIPv2 sends updates every 60 seconds. (B) RIPv2 is classful. (C) RIPv2 sends updates using multicast communication. (D) RIPv2 sends updates using broadcast communication. (E) RIPv2 supports authentication.
A. Bandwidth With OSPF, you can calculate the cost of a link by 100 000 000 / bandwidth. For example, if you have a 10 MB link, then the cost is calculated as 100000000/10000000 = 10. The cost on a 10 MB link is 10.
Which of the following is used to calculate OSPF cost? (A) Bandwidth (B) Delay (C) Hop count (D) Latency
A. Use the following commands: R1(config)#router rip R1(config-router)#network 192.168.3.0 R1(config-router)#network 192.168.4.0 In order to configure RIP, you must use the router rip command and then specify the networks you wish to advertise through RIP.
You have a router with two networks you wish to advertise through RIP - the 192.168.3.0 and the 192.168.4.0 networks. Which of the following identifies the commands you would use? (A) Use the following commands: R1(config)#router rip R1(config-router)#network 192.168.3.0 R1(config-router)#network 192.168.4.0 (B) Use the following commands: R1(config)#network 192.168.3.0 R1(config)#network 192.168.4.0 (C) Use the following commands: R1(config)#router rip R1(config-router)#network 192.168.3.0 0.0.0.255 R1(config-router)#network 192.168.4.0 0.0.0.255 (D) Use the following commands: R1(config)#router rip R1(config-router)#network 192.168.3.0 area 1 R1(config-router)#network 192.168.4.0 area 1
A. R1(config-router)#version 2 To enable RIPv2, you simply use the version 2 command while configuring RIP.
You have already configured RIPv1, but have recently learned of the benefits of RIPv2. What additional command(s) would you use to enable RIPv2? (A) R1(config-router)#version 2 (B) R1(config-router)#enable version 2 (C) R1(config)#version 2 (D) R1(config-router)#no version 1
C. show ip route To view the routing table and the routing entries that a routing protocol has added to the routing table, use the show ip route command.
You have configured RIP on your router and want to view the entries in the routing table. What command would you use? (A) show rip (B) show rip entries (C) show ip route (D) show ip rip
D. ip ospf priority 20 In order to change the priority on the router, you can use the ip ospf priority command. The router with the highest OSPF priority will become the DR.
You want to change the OSPF priority of router R1. What command would you use? (A) ospf priority 20 (B) ip priority ospf 20 (C) priority ospf 20 (D) ip ospf priority 20
A. R1(config-router)#distance 80 In order to change the administrative distance of RIP, you can use the distance command at the router prompt. In order to change the administrative distance to a value other than the default, you would not change it to 120, because that is the default value.
You want to change the administrative distance of RIP to a value other than its default. What command would you use? (A) R1(config-router)#distance 80 (B) R1(config-router)#distance 120 (C) R1(config)#distance 80 (D) R1(config)#distance 120
B. R1(config-router)#router-id 13.0.0.1 With OSPF, to change the router ID manually you can use the router-ID command at the router prompt when configuring OSPF.
You want to change the router ID of a Cisco router running OSPF. What command would you use? (A) R1(config-router)#router-id 105 (B) R1(config-router)#router-id 13.0.0.1 (C) R1(config)#router-id 13.0.0.1 (D) R1#router-id 105
D. show ip protocols In order to view information about the routing protocols running on the router, use the show ip protocols.
You want to view how frequently RIP is sending updates. What command would you use? (A) show rip (B) show protocols (C) show rip config (D) show ip protocols
A. Set the priority to 0. An OSPF router with the priority set to 0 will never become the DR.
You wish to ensure that router R1 never becomes the DR. What should you do? (A) Set the priority to 0. (B) Set the priority to 1. (C) Set the priority to 99. (D) Set the priority to 255.
A. 14.0.0.1 If the router-id is not set on the router, the router will use the highest IP address on any loopback interface as the router ID. If there are no loopback interfaces, the router will use the highest IP address on a physical interface as the router ID.
Your router has the interface configuration shown below. What is the router ID of the router? Loopback0: 12.0.0.1 Loopback1: 14.0.0.1 F0/1: 24.0.0.1 F0/2: 96.0.0.1 (A) 14.0.0.1 (B) 12.0.0.1 (C) 24.0.0.1 (D) 96.0.0.1
B. 224.0.0.5 OSPF hello messages are multicasted to the address of 224.0.0.5.
Hello messages are sent to which of the following addresses? (A) 255.255.255.255 (B) 224.0.0.5 (C) 239.0.0.5 (D) 255.0.0.0
D. Every 10 seconds Hello messages are sent every 10 seconds with OSPF.
How frequently are hello messages sent with OSPF? (A) Every 90 seconds (B) Every 60 seconds (C) Every 30 seconds (D) Every 10 seconds
A. Every 30 seconds All RIP versions send routing updates out every 30 seconds by default.
How frequently does RIPv1 send out routing table updates? (A) Every 30 seconds (B) Every 60 seconds (C) Every 90 seconds (D) Every 120 seconds
A. Every 30 seconds All RIP versions send routing updates every 30 seconds by default.
How frequently does RIPv2 send out routing table updates? (A) Every 30 seconds (B) Every 60 seconds (C) Every 90 seconds (D) Every 120 seconds
C. Every 10 seconds Hello messages are sent to discover neighboring routers. Hello messages are sent every 10 seconds.
How often are hello messages sent with OSPF? (A) Every 12 seconds (B) Every 20 seconds (C) Every 10 seconds (D) Every 30 seconds
C. It is the process ID for OSPF. When enabling OSPF, you specify the process ID you wish to run the instance of OSPF under.
Looking at the commands below, what is the purpose of the "1"? Router ospf 1 Network 192.168.2.0 0.0.0.255 area 0 (A) It is the OSPF priority. (B) It is the router ID. (C) It is the process ID for OSPF. (D) It is a bit flag setting OSPF to "on."
D. 3 Looking at the output of the show ip route command, you can see there are two RIP entries. The one with the destination network of 14.0.0.0 has a hop count of 3.
Looking at the figure below, how many hops away is the 14.56.7.8 system? (A) 1 (B) 120 (C) 5 (D) 3
B. show ip protocols The show ip protocols command is used to view information about the routing protocols running on a router.
Looking at the figure below, what command was used to create the output? (A) show ip route (B) show ip protocols (C) show rip (D) show ospf
D. The cost Because the routing protocol is OSPF, the 65 identifies the cost value on the link.
Looking at the figure below, what does the /65 indicate in the third route of the routing table? (A) The administrative distance (B) The bandwidth (C) The hop count (D) The cost
A. 25 Looking at the figure, you can see that the "Distance" is set to 25, while the default for RIP is 120. In this example, the administrator has modified the administrative distance of RIP from the default.
Looking at the figure below, what is the administrative distance? (A) 25 (B) 30 (C) 180 (D) 120
B. Version 1 Looking at the figure, you can see that the router has received a v1 update, which means version 1. You can also notice that the router is sending updates to the address of 255.255.255.255, which is a broadcast address. RIPv1 broadcasted updates, while RIPv2 multicasted the updates.
Looking at the figure below, what version of RIP has been enabled? (A) Version 2 (B) Version 1 (C) Version 4 (D) Version 3
D. 13.0.0.1 The highest IP address assigned to a loopback address would be used as the router ID. If no loopback address is present, then the router will use the highest IP address assigned to a physical interface.
Looking at the figure below, what would the router-ID of the router be? (A) 12.0.0.1 (B) R1 (C) R2 (D) 13.0.0.1
