Nokia Nokia Certifications 4A0-106 Questions & Answers

• Question 81:

  Which of the following about BGP loops in a VPRN environment is TRUE?

  A. Traditional BGP loop detection mechanisms are unable to detect a loop in a VPRN scenario.

  B. BGP loops are detected in a VPRN when the customer has separate sites using the same BGP autonomous system number.

  C. The Alcatel-Lucent 7750 SR rejects routes containing AS_PATH loops by default.

  D. When "remove-private" is configured at a PE, all routes received from the associated CE will have private AS numbers removed.

  Correct Answer: B

• Question 82:

  Click the exhibit.

  

  The AS-path nullification method is used to prevent CE2 from discarding routes received from CE1. On which router should the AS-path nullification policy be configured?

  A. CE1

  B. PE2

  C. PE1

  D. CE2

  Correct Answer: C

• Question 83:

  When VPRN Outbound Route Filtering (ORF) is enabled, each PE sends its ORF list to its peer using which of the following BGP message types?

  A. Open

  B. Update

  C. Route Refresh

  D. Notification

  Correct Answer: C

• Question 84:

  Which of the following is not a valid BGP design for a network provider supporting VPRNs?

  A. Full mesh of MP-BGP between all P devices

  B. Full mesh of MP-BGP between PE devices

  C. Route reflector configuration between PE devices

  D. Confederation configuration between PE devices

  Correct Answer: A

• Question 85:

  Click the exhibit.

  

  An Alcatel-Lucent 7750 SR is to be configured as a PE router that supports VPRNs using LDP as the transport protocol. Which of the following best describes this configuration?

  A. This configuration is correct and complete.

  B. This configuration is correct, except that the system interface must be added.

  C. This configuration is correct, except that the interfaces facing the CE routers must be added.

  D. MPLS configuration is not required.

  Correct Answer: D

• Question 86:

  Click the exhibit.

  

  If the displayed command is executed, what is the correct value of AS-Path in the BGP route 172.12.0.0/16 advertised by PE2?

  A. 64491 {64492 64493}

  B. 64491

  C. 64492 64493 64491

  D. {64492 64493)64491

  Correct Answer: A

• Question 87:

  On an Alcatel-Lucent 7750 SR, which CLI command displays the Route Target(s) associated to a prefix?

  A. Show router bgp routes

  B. Show router route-table summary

  C. Show router bgp routes vpn-ipv4 detail

  D. Show router route-table

  Correct Answer: C

• Question 88:

  VPN-IPv4 addressing is made unique by defining an address structure consisting of:

  A. A 64-bit Route Target followed by a 32-bit IPv4 address.

  B. A 64-bit Route Distinguisher followed by a 32-bit IPv4 address.

  C. A 32-bit Route Distinguisher followed by a 32-bit IPv4 address.

  D. A 32-bit Route Target followed by a 32-bit IPv4 address.

  Correct Answer: B

• Question 89:

  For the data packets in a VPRN, how is the inner label in an MPLS packet signaled?

  A. Signaled via MP-BGP and used to identify the egress PE.

  B. Signaled via T-LDP and used to identify the customer VPRN.

  C. Signaled via MP-BGP and used to identify the customer VPRN.

  D. Signaled via RSVP and LDP and used to identify the egress PE.

  E. Signaled via RSVP and LDP and used to identify the customer VPRN.

  Correct Answer: C

• Question 90:

  For a Carrier Supporting Carrier (CSC) VPRN where the customer carrier is a BGP/MPLS VPN Service Provider (SP), which of the following is FALSE?

  A. The customer carrier network can be a pure IP network.

  B. The customer carrier provides Layer 2 and Layer 3 services to its end-customers.

  C. A single CSC VPRN is configured on the network provider to support all services offered by the customer carrier.

  D. In the case where the customer carrier offers VPRN services, the model is referred to as hierarchical VPRN.

  Correct Answer: A