Nokia Nokia Certifications 4A0-100 Questions & Answers

• Question 221:

  Which transport protocol and port number is used by BGP to establish and maintain a peering session with other BGP speakers?

  A. TCP port 179.

  B. UDP port 179.

  C. TCP port 22.

  D. UDP port 22.

  Correct Answer: A

• Question 222:

  Which of the following best describes an autonomous system?

  A. An autonomous system is a network or group of networks operating under one administrative authority.

  B. An autonomous system is another term for the collection of routers that make up the Internet

  C. An autonomous system is a network or group of networks from many organizations running different IGP routing protocols, but all running BGP.

  D. An autonomous system is a loosely defined term that can refer to any organization that has a connection to the Internet.

  Correct Answer: A

• Question 223:

  In the diagram, R3 receives an LSA with sequence number 112 from R7 and installs it in its link state database. 10 ms. Later it receives a copy of the same LSA with a sequence number of 111 from R1. What does R3 do with the LSA from R1?

  

  A. R3 discards the LSA received from R1 and sends a copy of the LSA from its link state base to R1.

  B. R3 installs the LSA received from R1 in its link state database and floods a copy to its neighbors.

  C. R3 discards the LSA received from R1 and sends an ACK to R1.

  D. R3 installs the LSA received from R1 in its link state database, sends an ACK to R1 and floods a copy to its neighbors.

  Correct Answer: A

• Question 224:

  In the diagram, R3 receives an LSA with the sequence number 111 from R7 and then receives another copy of the LSA with a sequence number 112 from R1. What does R3 do with the LSA from R1?

  

  A. R3 discards the LSA received from R1 and sends a copy of the LSA from its link state base to R1.

  B. R3 installs the LSA received from R1 in its link state database and floods a copy to its neighbors.

  C. R3 discards the LSA received from R1 and sends an ACK to R1.

  D. R3 installs the LSA received from R1 in its link state database, sends an ACK to R1 and floods a copy to its neighbors.

  Correct Answer: D

• Question 225:

  In the diagram, R7 receives a new LSA from R3 and installs it in its link state database. 10 ms. later it receives another copy of the LSA with the same sequence number from R8. What does R7 do with the LSA received from R8?

  

  A. R7 silently discards the LSA received from R8.

  B. R7 installs the LSA received from R8 in its link state database and floods a copy to its neighbors.

  C. R7 discards the LSA received from R8 and sends an ACK to R8.

  D. R7 installs the LSA received from R8 in its link state database, sends an ACK to R8 and floods a copy to its neighbors.

  Correct Answer: C

• Question 226:

  Which of the following describes the normal sequence of events in the forming of an OSPF adjacency?

  A. Hello exchange, DB descriptor exchange, Link state requests and updates.

  B. DB descriptor exchange, Link state requests and updates, Hello exchange.

  C. Link state requests and updates, Hello exchange, DB descriptor exchange.

  D. Hello exchange, Link state requests and updates, DB descriptor exchange.

  Correct Answer: A

• Question 227:

  Which of the following are FALSE statements about the OSPF routing protocol? Choose two.

  A. OSPF is a link state protocol with fast convergence.

  B. OSPF supports hierarchy with multiple areas.

  C. The default metric for OSPF is hop count.

  D. OSPF does not support VLSM.

  E. OSPF supports neighbor authentication.

  Correct Answer: CD

• Question 228:

  Which of the following are TRUE statements about the router ID in OSPF? Choose two

  A. A router ID is not required by OSPF.

  B. The system address is used as the router ID if router-id is not set.

  C. The router ID is used to uniquely identify every OSPF router.

  D. On the Nokia 7750 SR, the router ID is set to the highest logical IP address if router-id is not explicitly set.

  Correct Answer: BC

• Question 229:

  You need to implement an interior gateway routing protocol for your network that supports scalability, fast convergence and VLSM. Which routing protocol would best serve your needs?

  A. RIPv1.

  B. RIPv2.

  C. OSPF.

  D. BGP.

  E. Static routes.

  Correct Answer: C

• Question 230:

  Which of the parameters in Hello messages exchanged between two OSPF neighbors must be the same to keep the adjacency alive in OSPF? (Choose four.)

  A. Interface MTU.

  B. Area ID.

  C. Authentication password.

  D. Hello interval.

  E. Dead interval.

  F. Router priority.

  Correct Answer: BCDE