4A0-102 Exam Training Practice Tests (Alcatel-Lucent Border Gateway Protocol)]

Question 1

Click the exhibit.

Routers RR1 are RR2 are redundant route reflectors for clients R3 and R4. Which of the following is a valid
configuration on router RR1?

A. Option D B. Option B C. Option A D. Option C

Correct Answer: D

Question 2

A router in AS 65100 receives two BGP routes. The first route is for 138.1.1.0/24 with an AS Path of 65200 65300, Local
Preference of 100, MED of 100, and router ID 10.10.10.10. The second route is for 138.1.0.0/16 with an AS Path of
65500 65300, Local Preference of 150, MED of 100, and router ID 10.1.1.1. Assuming all other attributes are equal,
which route would be used to forward an IP packet with destination IP address 138.1.1.1?

A. The second BGP route. B. It is impossible to determine without the value of the origin code for both routes. C. Both routes are used. D. The first BGP route.

Correct Answer: D

Question 3

Which of the following regarding the withdrawal of routes from one BGP speaker to another is TRUE?

A. A withdraw message is used. Multiple prefixes can be withdrawn at a time. B. An update message is used. Only a single prefix can be withdrawn at a time. C. A withdraw message is used. Only a single prefix can be withdrawn at a time. D. An update message is used. Multiple prefixes can be withdrawn at a time.

Correct Answer: D

Question 4

Click the exhibit.

Assuming router A is configured with "next-hop-self", what does the BGP update for prefix 192.168.0.1/27 contain
when it arrives at router B?

A. AS Path of 65200 65100, Next Hop of router E. B. AS Path of 65100, Next Hop of router E. C. AS Path of 65100, Next Hop of router A. D. AS Path of 65200 65100, Next Hop of router

Correct Answer: C

Question 5

What is the default Alcatel-Lucent 7750 SR TTL of a BGP advertisement between confederation members?

A. 255 B. 64 C. 1 D. 32

Correct Answer: C

Question 6

Click the exhibit.

Which of the following is a valid BGP configuration for router R2?

A. Option D B. Option B C. Option A D. Option C

Correct Answer: C

Question 7

Which of the following statements regarding BGP Fast Reroute is FALSE?

A. BGP Fast Reroute is triggered by IGP events. B. BGP Fast Reroute uses the optimal path to the destination. C. The backup path is pre-computed and installed in the FI D. BGP Fast Reroute is independent of number of affected prefixes.

Correct Answer: B

Question 8

Why is a full mesh of iBGP peers required?

A. To maximize control plane scalability. B. To ensure proper route propagation inside a transit AS. C. To ensure that all routers are directly connected. D. To ensure that all routers run iBGP inside a transit AS.

Correct Answer: B

Question 9

An Alcatel-Lucent 7750 SR receives a route from an eBGP peer without a MED. What MED value is sent to iBGP peers?

A. None B. 250 C. 100 D. The IGP cost

Correct Answer: A

Question 10

BGP is configured on two peers, routers A and B.
Router A is configured with a Hold Time timer of 60 seconds and a
Keepalive timer of 25 seconds. Router B is configured with a Hold Time timer of 90 seconds and a Keepalive timer of
70 seconds. What will the active Keepalive timer be on router B?

A. 20 seconds B. 70 seconds C. 30 seconds D. 25 seconds

Correct Answer: A

Question 11

Which of the following regarding BGP confederations is FALSE?

A. Within a confederation, each member AS is considered as a stand-alone AS. B. Member ASs within a confederation can use route reflection. C. The entire confederation is viewed as a single AS by an eBGP peer. D. Member ASs must be fully meshed within a confederation.

Correct Answer: D

Question 12

Which of the following behaviors regarding the modification of BGP attributes within a confederation is TRUE?

A. Next Hop is modified when crossing member AS boundaries within a confederation. B. None of the well known mandatory attributes is modified within a confederation. C. AS Path is modified when crossing member AS boundaries within a confederation. D. Origin Code is modified when crossing member AS boundaries within a confederation.

Correct Answer: C

Question 13

Click the exhibit.

Considering that both routers C and D are advertising the eBGP learned prefix 10.5.0.0/16 into ISP X, which of the
following best describes the route advertisement within ISP X?

A. Router C sends the update to routers E and F only. B. Router C sends the update to routers D, E and F. C. Router C sends the update to routers A, B, E and F. D. Router C sends the update to routers A, B, D, E and F.

Correct Answer: D

Question 14

Assuming that "client1" and "client2" are directly-connected networks, what is the result of executing the following
BGP export policy?

A. "client1" routes will be rejected. B. "client1" routes will be tagged with community "North". C. "client1" routes will be tagged with communities "North" and "West". D. "client1" routes will be tagged with community "West".

Correct Answer: B

Alcatel-Lucent Border Gateway Protocol - 4A0-102 Exam Practice Test