OSPF QUESTIONS AND ANSWERS
What are two drawbacks of implementing a link-state routing protocol? (Choose two)
A. the sequencing and acknowledgment of link-state packets
B. the requirement for a hierarchical IP addressing scheme for optimal functionality
C. the high volume of link-state advertisements in a converged network
D. the high demand on router resources to run the link-state routing algorithm
E. the large size of the topology table listing all advertised routes in the converged
network - Answer -Answer: B D
Which two statements describe the process identifier that is used in the command to
configure OSPF on a router? (Choose two)
Router(config)# router ospf 1
A. All OSPF routers in an area must have the same process ID.
B. Only one process number can be used on the same router.
C. Different process identifiers can be used to run multiple OSPF processes
D. The process number can be any number from 1 to 65,535.
E. Hello packets are sent to each neighbor to determine the processor identifier. -
Answer -Answer: C D
What are three characteristics of the OSPF routing protocol? (Choose three)
A. It converges quickly.
B. OSPF is a classful routing protocol.
C. It uses cost to determine the best route.
D. It uses the DUAL algorithm to determine the best route.
E. OSPF routers send the complete routing table to all directly attached routers.
F. OSPF routers discover neighbors before exchanging routing information. - Answer -
Answer: A C F
Explanation
OSPF is a link-state routing protocol so it converges more quickly than distance-vector
protocol. OSPF uses cost to determine the best route. The popular formula to calculate
OSPF cost is: cost = 108 / Bandwidth [ in bps] (in fact the formal formula is: cost =
reference bandwidth / configured bandwidth of interface in kbps. On Cisco routers, the
reference bandwidth defaults to 100000 kbps)
What are OSPF default hello and dead timers? (Choose two)
A. The hello timer is 10 seconds.
B. The hello timer is 60 seconds.
