4A0-102 Online Practice Questions and Answers

Which of the following best describes the purpose of advertise-external?

A. It enables a BGP speaker to advertise multiple external routes to iBGP peers.

B. It enables a BGP speaker to advertise its best external route to iBGP peers when the best overall route is internal.

C. It enables a BGP speaker to advertise its best external route to eBGP peers without an import policy.

D. It enables a BGP speaker to advertise its best internal route to eBGP peers without an export policy.

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.

Which of the following best describes the relationship between locally configured policies and the direction of traffic?

A. Import policies affect the way the local AS receives traffic, while export policies affect the way it sends traffic.

B. Import policies affect the way the local AS sends traffic, while export policies affect the way it receives traffic.

C. Both import and export policies affect the way the local AS receives traffic, but not the way it sends traffic.

D. Both import and export policies affect the way the local AS sends traffic, but not the way it receives traffic.

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

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".

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. A single route for 192.168.0.0/16 is advertised.

B. BGP routes 192.168.1.0/27, 192.168.2.0/27, and 192.168.0.0/16 are advertised.

C. 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.

D. The given export policy is invalid.

Click the exhibit.

Assuming a full iBGP mesh in ISP 1, how does router R1 in ISP 1 handle a BGP update received from ISP 2?

A. The update is sent to router R2 in ISP 1.

B. The update is sent to routers R2 and R3 in ISP 1.

C. The update is sent to all routers in ISP 1.

D. The update is sent to routers R2 and R3 in ISP 1, and to router R3 in ISP 2.

Which of the following statements regarding the Originator_ID attribute is TRUE?

A. The BGP router that originates an update sets the Originator_ID.

B. The Originator_IDis set to the ClusterJD of the advertising router reflector.

C. Both confederation and route reflector topologies use the Originator_ID.

D. A BGP router ignores an update that contains its own BGP router ID as Originator_ID.

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

A. 1

B. 32

C. 64

D. 255

Which of the following is considered a best practice for BGP address planning?

A. Advertising external networks into IGP.

B. Using system addresses for setting up iBGP sessions.

C. Exporting the networks associated with the external links of eBGP peers into BGP.

D. Optimizing BGP route table by exporting IGP routes into BGP.