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OSPF Routing Protocol
Chapter 11 CCNA 2
27
Computer Networking
12/04/2012

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Term
Refer to the exhibit. All routers are running OSPF. What cost would JAX put in its routing table for the 10.0.0.0/24 network?
Definition
1787
Term
Refer to the exhibit. Router1 and Router2 are running OSPF. The show ip ospf neighbor command reveals no neighbors. What is a possible cause?
Definition
OSPF hello or dead timers do not match.
Term
A fully converged five router OSPF network has been running successfully for several weeks. All configurations have been saved and no static routes are used. If one router looses power and reboots, what information will be in its routing table after the configuration file is loaded but before OSPF has converged?
Definition
Directly connected networks that are operational will be in the routing table.
Term
Refer to the exhibit. What configuration statements would give the results that are shown in the output of the show ip protocols command?
Definition
B(config)# router ospf 1
B(config-router)# router-id 192.168.1.5
Term
Refer to the exhibit. When OSPF is operational in the exhibited network, what neighbor relationship is developed between Router1 and Router2?
Definition
A FULL adjacency is formed.
Term
6. What does OSPF use to calculate the cost to a destination network?
Definition
bandwidth
Term
Refer to the exhibit. The routers in the exhibit are using default OSPF configuration settings to advertise all attached networks. If all of the routers start at the same time, what will be the result of the DR and BDR elections for this single area OSPF network? (Choose three.)
Definition
Router A will be DR for 10.4.0.0/16.

HQ will be BDR for 10.4.0.0/16.

Remote will be DR for 10.5.0.0/16.
Term
8. What does OSPF use to reduce the number of exchanges of routing information in networks where large numbers of neighbors are present? (Choose two.)
Definition
designated router

backup designated router
Term
Refer to the exhibit. All routers have been configured with the interface priorities that are shown. All routers were restarted simultaneously. The results of the DR/BDR election are shown. What can be concluded about this network?
Definition
The highest router ID was most likely determined via an OSPF router-id statement or statements.
Term
Refer to the exhibit. Router A is correctly configured for OSPF. Which OSPF configuration statement or set of statements was entered for router B to generate the exhibited routing table?
Definition
B(config-router)# network 192.168.1.0 0.0.0.3 area 0
Term
Refer to the exhibit. Assuming that the routers have default interface OSPF priorities and no configured loopback interfaces, what two roles will router B play on each network segment? (Choose two.)
Definition
DR for network 192.168.1.200

BDR for network 192.168.1.204
Term
Refer to the exhibit. Routers A, B, C, and D are all running OSPF with default router IDs and OSPF interface priorities. Loopback interfaces are not configured and all interfaces are operational. Router D is the DR and router C is the BDR. What happens immediately after the following commands are entered on router A?
Definition
D will remain the DR. C will remain the BDR.
Term
13. What range of networks will be advertised in the OSPF updates by the command Router1(config-router)# network 192.168.0.0 0.0.15.255 area 100?
Definition
192.168.0.0/24 through 192.168.15.0/24
Term
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?
Definition
There is no change in the DR or BDR until either current DR or BDR goes down.
Term
Refer to the exhibit. How many OSPF adjacencies must be formed to build the complete topology if a DR or BDR were not elected in this OSPF network?
Definition
6
Term
16. What is the default administrative distance for OSPF?
Definition
110
Term
Refer to the exhibit. Which command sequence on RouterB will redistribute a gateway of last resort to the other routers in OSPF area 0?
Definition
RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# router ospf 10
RouterB(config-router)# default-information originate
Term
18. Which two statements describe the use of OSPF DR/BDR elections? (Choose two.)
Elections are always optional.
Definition
Elections are required in broadcast multiaccess networks.

Elections are sometimes required in NBMA networks.
Term
Refer to the exhibit. What does the “2″ stand for in the router ospf 2 statement?
Definition
The number 2 identifies this particular instance of OSPF on this router.
Term
Refer to the exhibit. The network administrator wants to set the router ID of Router1 to 192.168.100.1. What steps can the administrator take to accomplish this?
Definition
nothing, the router-id of Router1 is already 192.168.100.1
Term
Refer to the exhibit. What must be received between neighbors to prevent the dead time that is shown in the exhibit from reaching zero?
Definition
hello packets
Term
Refer to the exhibit. What does the “O*E2″ from the “O*E2 0.0.0.0/0 [110/1] via 192.168.1.1, 00:05:34, Serial0/0/1″ line represent?
Definition
an external OSPF route that will not increment in cost.
Term
Refer to the exhibit. What is the cost of the route to the 10.0.0.0 network?
Definition
1786
Term
What three parameters must be indentical between OSPF routers in order to form an adjacency? (Choose three.)
Definition
area id

hello interval

network type
Term
Refer to the exhibit. What OSPF packets will trigger the reset of the Dead Time counter?
Definition
hello packets
Term
Refer to the exhibit. What is the cost of the route to the 172.16.2.128 network with the subnet mask of 255.255.255.128?
Definition
196
Term
Router R1 is participating in the OSPF routing protocol as well as the EIGRP routing protocol. If R1 learns of network 192.168.10.0/24 from both the OSPF and internal EIGRP routing protocols, how will the route appear in the routing table of R1?
Definition
Only the route learned from EIGRP will appear in the routing table.