4A0-102 Online Practice Questions and Answers

Click the exhibit.

Router R6 is a route reflector for clients R1, R2 and R5. Router R5 is configured with a local preference of

200. On which routers is "advertise-external* needed for router R6 to receive exactly two distinct routes for prefix 192.168.1.0/27?

A. On router R5 only.

B. On either router R1or R2.

C. On both routers R1and R2.

D. On all routers R1, R2 and R5.

Which of the following statements regarding BGP route selection is TRUE?

A. Lower local preference is preferred over higher local preference.

B. Higher MED is preferred over lower MED.

C. Higher origin code is preferred over lower origin code.

D. Lower BGP router ID is preferred over higher BGP router ID.

Click the exhibit.

Given that ISP 1 and ISP 2 are Tier 2 providers, and that ISP 3 and ISP 4 are Tier 1 providers, what is the most likely relationship between ISP 1 and the other ISPs?

A. ISP 1 has a peering relationship with ISP 2 and ISP 4.

B. ISP 1 has a peering relationship with ISP 2 and a transit relationship with ISP 3.

C. ISP 1 has a peering relationship with ISP 2 and ISP 3.

D. ISP 1 has a transit relationship with ISP 2 and ISP 4.

E. ISP 1 has a transit relationship with ISP 2 and a peering relationship with ISP 3.

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

An Alcatel-Lucent 7750 SR is configured with an export policy to redistribute its directly- connected networks into BGP. Which of the following databases contains the routes for these networks?

A. The routes are in the RIB-In.

B. The routes are in the Loc-RIB.

C. The routes are in the RIB-Out.

D. The routes are not in any of the BGP databases.

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

A. Only entry 10 is executed for "client1" and "client2".

B. Entries 10 and 20 are executed for "client1", and entries 10 and 30 are executed for "client2".

C. Entries 10 and 20 are executed for "client1", and entries 10, 20 and 30 are executed for "client2".

D. Entry 10 is executed for directly-connected routes, entry 20 for "client1" and entry 30 for "client2".

Click the exhibit.

Assume all router-IDs are properly configured, and link-local IPv6 addresses are used to establish the eBGP sessions. Which of the following is the MINIMAL configuration 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

Upon the successful establishment of a TCP session between peers, what type of BGP message is exchanged?

A. OpenSent

B. Keepalive

C. Open

D. Notification

E. Update

A confederated AS is comprised of three members. One member is comprised of 4 routers, while the other two members are comprised of 3 routers each. Assuming member ASs are fully meshed and use full mesh iBGP, what is the required number of BGP sessions within the confederation?

A. 12

B. 13

C. 14

D. 15

What kind of attribute is the aggregator?

A. Well-known mandatory

B. Well-known discretionary

C. Optional transitive

D. Optional non-transitive