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4A0-102 Questions and Answers

Question # 6

What will happen if an update is received with an unrecognized optional non-transitive attribute?

A.

The router will accept the update and send a notification.

B.

The router will not accept the update and send a notification.

C.

The router will accept the update and ignore the attribute.

D.

The router will accept the update and propagate the attribute.

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Question # 7

What class of attribute is Originator_ID?

A.

Well-known mandatory.

B.

Well-known discretionary.

C.

Optional transitive.

D.

Optional non-transitive.

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Question # 8

Which of the following parameters does NOT have to match for an iBGP session to be successfully established?

A.

BGP version number.

B.

The local AS number.

C.

The Hold Time.

D.

Authentication.

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Question # 9

Click the exhibit.

Router R2 receives a route to 192.168.1.0/27 from router R4, and sets the local preference to 110. Router R1 receives a route to 192.168.1.0/27 from router R3, and sets the local preference to 80. Both ASs have a full iBGP mesh. What path does traffic destined to 192.168.1.0/27 take from router R1?

A.

R1-R3-R8

B.

R1-R2-R4-R8

C.

R1-R3-R4-R8

D.

R1-R2-R4-R3-R8

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Question # 10

Router R1, in AS 65540, has the export policy shown below. It advertises an aggregate route to eBGP peer router R2 in 65550. What is the AS Path of the aggregate route received by router R2?

A.

65540

B.

65540 1

C.

65540 65540

D.

65550 65540

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Question # 11

Click the exhibit.

Which of the following about the relationship between ISP 1 and ISP 3 is TRUE?

A.

ISP 1 is downstream from ISP 3 and is expected to push more traffic toward ISP 3 than it pulls from it.

B.

ISP 3 is downstream from ISP 1 and is expected to push more traffic toward ISP 1 than it pulls from it.

C.

ISP 1 is downstream from ISP 3 and is expected to pull more traffic from ISP 3 than it pushes toward it.

D.

ISP 3 is downstream from ISP1 and is expected to pull more traffic from ISP 1 than it pushes toward it.

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Question # 12

Which of the following statements regarding the Internet is FALSE?

A.

It is a global network relying on interconnections provided by Internet service providers.

B.

It is a continuous and interconnected set of public IP networks, advertised and shared across the globe.

C.

It is a settlement-free global network that provides interconnection between Internet service providers.

D.

It is a network that allows any Internet service provider to reach every other Internet service provider in the world.

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Question # 13

Which of the following regarding BGP Path Identifier is FALSE?

A.

Path-ID is a four-octet identifier pre-pended to the NLRI field of a BGP update.

B.

Path-ID is an optional transitive attribute used to advertise multiple paths.

C.

Path-ID uniquely identifies each path advertised to a neighbor.

D.

A BGP speaker that re-advertises a route must generate its own Path-ID.

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Question # 14

Click the exhibit.

Given the following configuration of router R1, what can be said about the function of each of AS 65540s routers?

A.

Routers R1 and R2 are redundant route reflectors with clients R3 and R4.

B.

Routers R3 and R4 are route reflectors with clients R1 and R2.

C.

Router R1 is a route reflector with clients R2, R3 and R4.

D.

Router R1 is a route reflector with clients R3 and R4.

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Question # 15

Two Alcatel-Lucent 7750 SRs are established BGP peers with the following add-paths configuration:

R1: configure router bgp add-paths ipv4 send 4 receive

R2: configure router bgp add-paths ipv4 send 2

If router R1 advertises three routes for a given prefix X, how many routes is router R2 expected to have for prefix X?

A.

None

B.

2

C.

3

D.

4

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Question # 16

When implementing a BGP policy on an Alcatel-Lucent 7750 SR, which of the following types of address space would a typical address plan need to cover?

A.

RIR assigned CIDR space.

B.

External client address space.

C.

Loopback or link addresses.

D.

External link addresses.

E.

All of the above.

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Question # 17

Click the exhibit.

If router A originates a BGP route for prefix 192.168.0.1/27, what will the update contain when it reaches router B?

A.

AS Path of 65200, Next Hop of router A, Origin of IGP.

B.

AS Path of 65200, Next Hop of router A, Origin of incomplete.

C.

Null AS Path, Next Hop of router A, Origin of IGP.

D.

Null AS Path, Next Hop of router A, Origin of incomplete.

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Question # 18

Click the exhibit.

Routers RR1 and RR2 are route reflectors with the same cluster-ID. How many updates for prefix 192.168.1.0/27 are received at router RR1?

A.

1

B.

2

C.

3

D.

4

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Question # 19

Click the exhibit.

Which of the following statements best describes the BGP sessions within the given network?

A.

The session between AS 65202 and AS 65206 is an iBGP session.

B.

The session between AS 65204 and AS 65206 is an intra-confederation eBGP session.

C.

A BGP session is required between AS 65202 and AS 65204.

D.

The BGP sessions within the member ASs are known as inter-confederation BGP sessions.

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Question # 20

Click the exhibit.

An update travels from AS 137000 to AS 135000, traversing both 32-bit and 16-bit AS Paths.

What AS Path is seen by AS 200?

A.

140000 137000

B.

137000 140000

C.

23456 23456

D.

200 140000 137000

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Question # 21

Which of the following statements about the BGP Advertise External feature is FALSE?

A.

It modifies the BGP advertisement logic.

B.

It improves convergence times and allows for better load sharing.

C.

It allows a router to advertise multiple external paths for a single prefix.

D.

It supports both IPv4 and IPv6.

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Question # 22

Which of the following AS Paths will match the regular expression "65100."?

A.

"65100"

B.

"65100 65200''

C.

"65200 65100"

D.

"65100 65250 65200"

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