Nokia Nokia Certifications 4A0-C01 Questions & Answers

• Question 671:

  Click on the exhibit.

  

  Two neighboring OSPF routers have exchanged the packets shown. What state is the adjacency in?

  A. Down

  B. Initializing

  C. 2-way

  D. Full

  Correct Answer: D

• Question 672:

  A router running a link-state protocol sends an update to a neighbor. The neighbor sends an update back. Why would the neighbor do this?

  A. The neighbor's link-state database has newer information than what it received in the update.

  B. The neighbor sends the update as an acknowledgement.

  C. The neighbor's update indicates that it has run out of space in its LSDB.

  D. The neighbor's update indicates that the sequence number received is the same as the one already in its link-state database.

  Correct Answer: A

• Question 673:

  What event causes an OSPF adjacency to change from 'down' to 'two way'?

  A. The router receives a link-state update in response to a link-state request.

  B. The router receives a Hello packet from its neighbor that contains its own router ID in the neighbor list.

  C. The router receives a database description packet from its neighbor.

  D. The router receives a link-state acknowledgement in response to a link-state update

  Correct Answer: B

• Question 674:

  Click on the exhibit.

  

  Router R1 distributes its loopbacks into IS-IS and globally routed addresses are configured as shown.

  How many routes will router R4 have in its IPv6 route table?

  A. 1

  B. 2

  C. 3

  D. 4

  E. 6

  F. 7

  Correct Answer: C

• Question 675:

  

  A service provider is deploying a 6over4 tunnel to connect a customer's branch office IPv6 network to the corporate headquarters as shown in the exhibit. Which command is used to create a default route on PE2 for the branch office network?

  A. configure router static-route 0.0.0.0/0 indirect 10.10.10.2

  B. configure router static-route 0.0.0.0/0 indirect 2001:DB8:1:100::1

  C. configure router static-route ::/0 indirect 10.10.10.2

  D. configure router static-route::/0indirect2001:DB8:1:100::1

  E. configure outer static-route::/0indirect2001:DB8:1:101::1

  Correct Answer: C

• Question 676:

  An OSPF adjacency is stuck in the exstart state. What is the most likely cause?

  A. The MTU does not match on both interfaces.

  B. OSPF is not enabled on one of the routers.

  C. The router ID is the same on both routers.

  D. An OSPF Hello has not been received from the neighbor.

  E. The interfaces are configured as point-to-point on one side and broadcast on the other.

  Correct Answer: A

• Question 677:

  Click on the exhibit.

  

  OSPF is operational on all links in the network diagram, all links are the same cost, and all routers are configured with an ECMP value of 4. Router R4 advertises the prefix 192.168.3.0/24 into OSPF.

  How many entries for prefix 192.168.3.0/24 will be in router R5's routing table?

  A. 0

  B. 1

  C. 2

  D. 3

  E. 4

  Correct Answer: C

• Question 678:

  Click on the exhibit.

  

  Before the link failure, all routers have operational OSPF adjacencies between them and there is a BFD session between routers R1 and R3.

  After the link failure, which of the following affects the IGP convergence time?

  A. The convergence time depends on the value of the OSPF hello timers on routers R1 andR3.

  B. The convergence time depends on the value of the OSPF hello timers and Dead interval on routers R1 and R3.

  C. The convergence time depends on the value of the BFD interval and multiplier settings on routers R1 andR3.

  D. The convergence time depends on the time taken by the switches to detect the link failure.

  Correct Answer: C

• Question 679:

  Click the exhibit button.

  

  If router R2 redistributes the IS-IS route to 192.168.3.0/24 into OSPF, router R3 will receive two routes to 192.168.3.0/24. What will be the preference of these two routes? Assume that all IS-IS routers are L1/L2 capable and are in the same area. Choose two answers.

  A. The OSPF internal preference

  B. The IS-IS Level 1 internal preference

  C. The IS-IS Level 2 internal preference

  D. The OSPF external preference

  E. The IS-IS Level 2 external preference

  F. The IS-IS Level 1 external preference

  Correct Answer: BD

• Question 680:

  What is the primary purpose of variable length subnet masks (VLSM)?

  A. To reduce the size of each routing update.

  B. To allow interoperability between routing protocols.

  C. To allow different subnet masks for different subnets.

  D. To reduce the size of the routing table.

  Correct Answer: C