Alcatel-Lucent Alcatel-Lucent Certifications 4A0-102 Questions & Answers

• Question 1:

  A BGP session is in OpenConfirm state. Which of the following messages must be received to transition to

  Established state?

  A. Update

  B. Open

  C. Notification

  D. Keepalive

  Correct Answer: D

• Question 2:

  What are the well-known mandatory BGP attributes?

  A. Origin, Next Hop and Local Preference.

  B. Local preference, AS Path and Next Hop.

  C. Aggregator, Next Hop and AS Path.

  D. AS Path, Next Hop and Origin.

  Correct Answer: D

• Question 3:

  Click the exhibit.

  AS 65540 routers are iBGP fully-meshed. Prefixes advertised by router R2 have a local preference of 200. Router R1 advertises the prefix 192.168.1.0/27 to routers R2 and R3. Assuming that router R3 is configured with "advertise-external", what is the expected output of "show router bgp routes" when executed on router R4?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: C

• Question 4:

  What kind of attribute is the aggregator?

  A. Well-known mandatory

  B. Well-known discretionary

  C. Optional transitive

  D. Optional non-transitive

  Correct Answer: C

• Question 5:

  How is the aggregator attribute handled with 32-bit AS numbers?

  A. With the same method and attribute as 16-bit AS numbers.

  B. With the same method as 16-bit AS numbers, but using the AS4_Aggregator attribute.

  C. Aggregation is not yet supported with 32-bit AS numbers.

  D. By using a dummy value of 23456 in the 16-bit AS aggregator field. This value lets the router know it needs to read the 32-bit AS number that is contained in the nextTLV.

  Correct Answer: B

• Question 6:

  Click the exhibit.

  

  Assume all router-IDs are properly configured, and global IPv6 addresses are used to establish eBGP sessions. Which of the following configurations is required on router A so that router B can exchange traffic with router D?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: A

• Question 7:

  Which of the following is considered a best practice for BGP address planning?

  A. Advertising external networks into IGP.

  B. Using system addresses for setting up iBGP sessions.

  C. Exporting the networks associated with the external links of eBGP peers into BGP.

  D. Optimizing BGP route table by exporting IGP routes into BGP.

  Correct Answer: B

• Question 8:

  Which of the following regarding BGP confederations is FALSE?

  A. A confederation is a collection of Autonomous Systems advertised as a single AS number to BGP speakers outside the confederation.

  B. Each member AS must either maintain a full mesh of iBGP sessions, or use route reflection.

  C. Confederations can be used to subdivide ASs that have a large number of BGP speakers into smaller domains.

  D. A full mesh of intra-confederation eBGP sessions is required between the member ASs.

  Correct Answer: D

• Question 9:

  What class of attribute is Originator_ID?

  A. Well-known mandatory.

  B. Well-known discretionary.

  C. Optional transitive.

  D. Optional non-transitive.

  Correct Answer: D

• Question 10:

  Which of the following prefix-lists is the most specific match for prefix 172.31.2.1/24?

  A. Prefix 172.16.0.0/12 longer.

  B. Prefix 172.31.0.0/22 longer.

  C. Prefix 172.31.0.0/23 longer.

  D. Prefix 172.31.0.0/24 exact.

  Correct Answer: B