4A0-102 Online Practice Questions and Answers

Which of the following statements about an autonomous system is FALSE?

A. An AS is a set of routers under a single technical administration.

B. An AS efficiently advertises all IGP known routes to other ASs.

C. An AS presents a consistent routing policy to other autonomous systems.

D. An AS has a 2-byte or 4-byte AS number assigned.

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

A. 100

B. 250

C. The IGP cost

D. None

Click the exhibit.

Which of the following can be used by router R4 in AS 65542 to reject all routes originating in AS 65540?

A. An import policy that rejects updates with an AS Path matching the regular expression ".+ 65540 .+".

B. An import policy that rejects updates with an AS Path matching the regular expression ".+ 65540".

C. An import policy that rejects updates with an AS Path matching the regular expression "65540 .+".

D. An import policy that rejects updates with an AS Path matching the regular expression "65540".

Which of the following statements regarding BGP FRR is FALSE?

A. The router must receive several BGP routes to compute a backup path.

B. BGP FRR can be triggered by BFD.

C. The backup path can use the same next hop as the primary path.

D. BGP peer-tracking can be used to improve BGP FRR failure detection times.

Which of the following organizations would an ISP based in Europe approach for an IP prefix assignment?

A. ARIN

B. ICANN

C. RIPE NCC

D. LACNIC

E. APNIC

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

A. BGP Fast Reroute is triggered by IGP events.

B. The backup path is pre-computed and installed in the FIB.

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

D. BGP Fast Reroute uses the optimal path to the destination.

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 R1?

A. Option A

B. Option B

C. Option C

D. Option D

Which of the following prefix lists include prefixes 192.168.128.0/17 and 192.168.64.0/18?

A. Prefix list 192.168.0.0/16 through 18.

B. Prefix 192.168.0.0/17 longer.

C. Prefix list 192.168.0.0/17 through 18.

D. Prefix 192.160.0.0/13 longer.

An Alcatel-Lucent 7750 SR receives a route from an eBGP peer with a MED value of 500.

What MED value is sent to iBGP peers?

A. 100

B. The IGP cost

C. 500

D. None

Click the exhibit.

AS 65540 routers are iBGP fully-meshed. Assume routers R4, R5 and R6 are configured with addpaths ipv4 send 2 receive". Which routes to 192.168.0.1/27 is router R6 expected to have in its BGP routing table?

A. Two routes from router R4.

B. Two routes from router R5.

C. Two routes; one from router R4 and one from router R5.

D. Four routes; two from router R4 and two from router R5.

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 A

B. Option B

C. Option C

D. Option D

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 first route will appear in the RIB-Out.

B. Only the second route will appear in the RIB-Out.

C. Only the third route will appear in the RIB-Out.

D. All routes will appear in the RIB-Out.

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. Origin Code is modified when crossing member AS boundaries within a confederation.

C. AS Path is modified when crossing member AS boundaries within a confederation.

D. None of the well known mandatory attributes is modified within a confederation.

Which of the following is NOT a BGP message type?

A. Route-Refresh

B. OpenSent

C. Notification

D. Update

E. Keepalive

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.