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4A0-102 Sample Questions Answers

Questions 4

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?

Options:

A.

None

B.

2

C.

3

D.

4

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Questions 5

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?

Options:

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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Questions 6

Which of the following prefix-lists is the most specific match for prefixes 192.168.64.1/20 and

192.168.32.5/19?

Options:

A.

Prefix 192.168.0.0/17 longer.

B.

Prefix 192.168.0.0/19 longer.

C.

Prefix 192.168.96.0/19 longer.

D.

Prefix 192.168.0.0/18 longer.

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Questions 7

Click the exhibit.

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

What will the AS Path be when the update reaches AS 137000?

Options:

A.

140000 200 135000

B.

137000 140000 200 135000

C.

140000 23456 135000

D.

135000 200 140000

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Questions 8

Which of the following statements regarding the Internet is FALSE?

Options:

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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Questions 9

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 none of the routers in AS 65540 is configured with "advertise-external", what is the expected output of "show router bgp routes" on router R5?

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Questions 10

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?

Options:

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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Questions 11

Click the exhibit.

Router R6 is a route reflector with clients R1, R2, R4 and R5. Router R4 receives three routes from router R6 and is configured with ECMP 3. Given the following BGP configuration on routerR4, how many primary and backup paths will be present in router R4's BGP routing table?

Options:

A.

Three primary paths,

B.

Two primary paths and one backup path.

C.

One primary path and two backup paths.

D.

One primary path and one backup path.

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Questions 12

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?

Options:

A.

70 seconds

B.

25 seconds

C.

20 seconds

D.

30 seconds

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Questions 13

Which of the following behaviors regarding the modification of BGP attributes within a confederation is TRUE?

Options:

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.

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Questions 14

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

Options:

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.

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Questions 15

Click on the exhibit.

AS 65540 is using MPLS to provide BGP shortcuts for its iBGP routing. Which routers must be configured with the "configure router bgp igp-shortcuts rsvp-te" command?

Options:

A.

Routers R6, R1, R4 and R5.

B.

Routers R1and R4.

C.

Routers R1, R2, R3 and R4.

D.

Routers R2 and R3.

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Questions 16

Click the exhibit.

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

Options:

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".

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Questions 17

Click the exhibit.

Assuming router A is configured with "next-hop-self", what does the BGP update for prefix 192.168.0.1/27 contain when it arrives at router B?

Options:

A.

AS Path of 65200 65100, Next Hop of router A.

B.

AS Path of 65200 65100, Next Hop of router E.

C.

AS Path of 65100, Next Hop of router A.

D.

AS Path of 65100, Next Hop of router E.

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Questions 18

Click the exhibit.

Which of the following is a valid confederation configuration for Router R2?

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Questions 19

Which of the following is TRUE if the local state of BGP is OpenConfirm?

Options:

A.

The local system has received a Keepalive message and is ready to exchange updates.

B.

The local system is exchanging Update messages with its neighbor.

C.

The local system has sent a Keepalive message to its neighbor and is waiting to receive one back.

D.

The local system has sent an Open message to its neighbor and is waiting to receive one back.

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Questions 20

Which of the following describes BGP route processing on the Alcatel-Lucent 7750 SR?

Options:

A.

If no import policy is specified, all valid BGP routes are passed to the BGP route selection process.

B.

If no export policy is specified, all non-BGP routes are populated into RIB-Out.

C.

If no import policy is specified, all BGP routes are populated into the route table.

D.

If no import policy is specified, only valid BGP routes are populated into RIB-Out.

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Questions 21

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

Options:

A.

OpenSent

B.

Keepalive

C.

Open

D.

Notification

E.

Update

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Questions 22

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?

Options:

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.

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Exam Code: 4A0-102
Exam Name: Nokia Border Gateway Protocol
Last Update: May 1, 2024
Questions: 152
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