Question 1

A router receives an OSPF database description packet from a neighbor that references an LSA, which is already in the router's LSDB. The sequence number in the DBD packet is lower than the sequence number of the LSA in the LSDB.What action does the router take?

Options :

A : The router sends a link-state update to its neighbor.

B : The router sends a link-state update to its neighbor.

C : The router updates the information in its LSDB with the information received from its neighbor.

D : The router sends a link-state request to its neighbor.

E : The router takes no action.

Answer: A

Question 2

Which of the following best describes the type of packets used by OSPF routers to exchange updates on a point-to-point link?

Options :

A : IP packets sent to an IP multicast address.

B : TCP packets sent to an IP multicast address.

C : IP packets sent to an IP unicast address.

D : UDP packets sent to an IP multicast address.

Answer: A

Question 3

Identify two attributes of Distance Vector Protocols: (Choose two)

Options :

A : Use split horizon by default.

B : Send information about directly connected links to neighbors at periodic intervals.

C : Use holddown timers when topologies change to allow for convergence.

D : Maintain multiple databases: neighbor, topology and routing.

Answer: A,C

Question 4

NSSA LSA packets are what type within an NSSA area, and are converted to what other type at the ABR?

Options :

A : They are type 7 within the area and are not modified at the ABR

B : They are type 5 within the area and converted to type 3 at the ABR

C : They are type 5 within the area and are not modified at the ABR

D : They are type 7 within the area and converted to type 5 at the ABR

Answer: D

Question 5

An interface is configured on a router for OSPF but the command 'show router ospf neighbor' does not show any neighbors. Which of the following is NOT a possible cause?

Options :

A : An OSPF database description packet has not been received from the neighbor.

B : The interface facing the neighbor is down.

C : The interface is included in a different area than the neighbor router.

D : The router has not received a valid OSPF Hello packet from its neighbor.

Answer: A

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