Nokia Nokia Certifications 4A0-101 Questions & Answers

• Question 281:

  Which of the following statements best describes an OSPF type 3 LSA?

  A. An OSPF type 3 LSA is an intra-area LSA, generated by the ABR only when route summarization is configured.

  B. An OSPF type 3 LSA is an inter-area LSA, generated by the ABR only when route summarization is configured.

  C. An OSPF type 3 LSA is an inter-area LSA, generated by an ASBR to describe external routes.

  D. An OSPF type 3 LSA is an inter-area LSA, generated by the ABR to describe a route to neighbors outside the area.

  Correct Answer: D

• Question 282:

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

  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.

  Correct Answer: A

• Question 283:

  Click the exhibit button.

  

  The OSPF packets shown have been exchanged between two neighbors. What state is the OSPF adjacency in?

  A. The adjacency state is two way because both routers have received a database description packet.

  B. The adjacency is in the exchange state. The next step is to exchange link state request and link state update packets.

  C. The adjacency is in the ex start state. The routers have exchanged database description packets, but still have to negotiate the starting sequence number.

  D. The adjacency state is full. The routers are exchanging database description packets to notify each other that all link state advertisements have been received.

  Correct Answer: C

• Question 284:

  If OSPF is used in a multi-area OSPF network, which of the following statements regarding route summarization is true?

  A. Manual route summarization can only be done on autonomous system border routers.

  B. Manual route summarization must be done on all the backbone routers to be effective. Manual route summarization is optional on the routers in non-backbone areas.

  C. Manual route summarization is done on the ABRs. By default, automatic summarization is done; however, it may not be optimal for all networks.

  D. Manual route summarization is done on the ABRs. By default, no route summarization is done and all routes are advertised to all areas.

  Correct Answer: D

• Question 285:

  Which of the following OSPF area types are supported by the Alcatel- Lucent 7750 SR? Choose two answers.

  A. Not so stubby areas

  B. Level1 area WC

  C. Stub areas

  D. Partially stubby areas

  E. Level 2 areas

  Correct Answer: AC

• Question 286:

  Which of the following correctly lists the 5 OSPF packet types?

  A. Hello, link state update, link state packet, link State acknowledgement, database description.

  B. Link state update, link state refresh, link state acknowledgement, database description, notification.

  C. Hello, link state refresh, link state update, link state acknowledgement, link state authentication.

  D. Hello, link state update, link state request, link state acknowledgement, database description.

  Correct Answer: D

• Question 287:

  Which of the following statements regarding area border routers in an OSPF network is true?

  A. The term backbone router has the same definition as the term area border router.

  B. An OSPF network needs at least one area border router to function.

  C. Area border routers connect the backbone area to other areas in an OSPF network.

  D. By definition, an area border router must perform route summarization between areas.

  Correct Answer: C

• Question 288:

  When are virtual links used in OSPF?

  A. When two areas need to communicate and there is no area 0.

  B. When an area needs to traverse another area to reach area 0.

  C. When two areas are connected to area 0, but there is no direct path between them.

  D. When an area needs to connect directly to another area without using area 0.

  Correct Answer: B

• Question 289:

  What is the protocol number for OSPF in the IP header?

  A. OSPF uses TCP, so the protocol number is 6.

  B. OSPF uses UDP, so the protocol number is 17.

  C. OSPF does not use IP.

  D. OSPF has its own protocol number of 89.

  Correct Answer: D

• Question 290:

  Click the exhibit button.

  

  Which of the following would correctly configure routers R2, R3, and R4?

  

  

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: C