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.

Click the exhibit.

AS 65100 is advertising 192.168.1.0/27 into BGP. Which of the following AS Paths would the prefix 192.168.1.0/27 contain when viewed on router R7?

A. 65206 65202 65100

B. (65206 65202)65100

C. (65204 65206 65202) 65100

D. (65200) 65100

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. 70 seconds

B. 25 seconds

C. 20 seconds

D. 30 seconds

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".

Click the exhibit.

Given the following configuration for router R1, what is the expected Next Hop for prefix 192.168.1.0/27 as seen on router R2?

A. 10.0.2.1

B. 10.0.2.2

C. 10.16.10.1

D. 10.16.10.3

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

What MED value is sent to eBGP peers?

A. 100

B. The IGP cost

C. 500

D. None

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 BGP update to routers D and C.

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

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

D. Router B propagates the update to routers A, C and D.

How are policy direction and data flow related on the Alcatel-Lucent 7750 SR?

A. Import policies affect ingress data flow.

B. Export policies affect ingress data flow.

C. Both import and export policies affect ingress data flow.

D. Policy direction and data flow are independent.

Which of the following regarding the TTL of a BGP message is TRUE?

A. TTL is a well-known mandatory BGP attribute.

B. The default TTL value of an eBGP message is 1, and 64 for an iBGP message.

C. The default TTL value of an iBGP message can be modified using the multihop command.

D. The default TTL value of an eBGP message can be modified using the "ttl-security" command.

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 re-evaluate all routes in the RIB-In against the configured import policies.

C. Execute a command to reset the BGP session with the affected peer or peers.

D. No further action is required.