4A0-102無料問題集「Alcatel-Lucent Border Gateway Protocol」

質問 1

Click the exhibit.

When router A receives the BGP update for the 192.168.0.1/27 prefix, it propagates it to routers B and C.
What action is taken by router B when it receives the update?

（A）Router B propagates the update to routers A, C and

（B）Router B propagates the BGP update to routers D and C.

（C）Router B detects duplicates in its BGP database and discards the update.

（D）Router B propagates the BGP update to router D.

正解：D 解答を投票する

質問 2

When an Alcatel-Lucent 7750 SR receives a BGP route with an AS Path loop, what action is taken by default?

（A）The route is flagged as invalid and placed in the RIB-Out.

（B）The route is flagged as invalid and placed in the RIB-In.

（C）The route is flagged as invalid and placed in the LOC-RI

（D）The route is ignored.

正解：B 解答を投票する

質問 3

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）BGP Fast Reroute is independent of number of affected prefixes.

（D）The backup path is pre-computed and installed in the FI

正解：B 解答を投票する

質問 4

Which of the following regarding the atomic aggregate attribute is TRUE?

（A）It is an optional non-transitive attribute.

（B）The atomic aggregate flag is always set if the aggregator attribute is set.

（C）The atomic aggregate flag is always set if the AS Path information is lost due to aggregation.

（D）It is an optional transitive attribute.

正解：C 解答を投票する

質問 5

A router receives two routes from its neighbors: a route from OSPF for 10.0.0.0/24, and a route from BGP for
10.0.0.0/8. Both routes have reachable next hops. Which of the following is TRUE?

（A）Both routes are in the route table.

（B）None of the routes is in the route table.

（C）Only the OSPF route is in the route table.

（D）Only the BGP route is in the route table.

正解：A 解答を投票する

質問 6

Based on the default settings for the Alcatel-Lucent 7750 SR, when a policy change is made and committed, what
action is required by the user for the change to take effect?

（A）Execute a command to re-evaluate all routes in the Local-RIB against the configured export policies.

（B）Execute a command to reset the BGP session with the affected peer or peers.

（C）Execute a command to re-evaluate all routes in the RIB-In against the configured import policies.

（D）No further action is required.

正解：D 解答を投票する

質問 7

A BGP router has loopback interfaces 192.168.1.1/27 and 192.168.2.1/27 advertised into BGP using the following
export policy. The "aggregate 192.168.0.0/16" command is executed. What is the effect of this configuration?

（A）BGP routes 192.168.1.0/27 and 192.168.2.0/27 are advertised, and 192.168.0.0/16 appears as a "Blackhole" route
in the route table only.

（B）A single route for 192.168.0.0/16 is advertised.

（C）The given export policy is invalid.

（D）BGP routes 192.168.1.0/27, 192.168.2.0/27, and 192.168.0.0/16 are advertised.

正解：A 解答を投票する

質問 8

Click the exhibit.

Router R1 is a route reflector with clients R2, R5 and R6. Prefixes advertised by router R5 have a local preference of
200. Router R3 advertises the prefix 192.168.1.0/27 to routers R5 and R6. Assuming that router R6 is configured with
"advertise-external", what is the expected output of "show router bgp routes" when executed on router R5?

（A）Option D

（B）Option B

（C）Option C

（D）Option A

正解：C 解答を投票する

質問 9

A router in AS 65100 receives three routes for 138.120.0.0/16. The first route has an AS Path of 65200 65400 65300
and a local preference of 150. The second route has an AS Path of 65200 65300 and a local preference of 100. The
third route has an AS Path of 65600 65300 and a local preference of 100. Which route will appear in the RIB-out?

（A）Only the third route will appear in the RIB-Out.

（B）Only the first route will appear in the RIB-Out.

（C）All routes will appear in the RIB-Out.

（D）Only the second route will appear in the RIB-Out.

正解：B 解答を投票する

質問 10

Which of the following regarding BGP confederations is FALSE?

（A）Within a confederation, each member AS is considered as a stand-alone AS.

（B）The entire confederation is viewed as a single AS by an eBGP peer.

（C）Member ASs within a confederation can use route reflection.

（D）Member ASs must be fully meshed within a confederation.

正解：D 解答を投票する

4A0-102 無料問題集「Alcatel-Lucent Border Gateway Protocol」

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