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Nokia Border Gateway Protocol Questions and Answers

Question 1

Which of the following statements regarding route reflectors is TRUE?

Options:

A.

Route reflectors propagate BGP learned routes to their clients.

B.

Route reflectors require "n" iBGP sessions, where "n" is the number of BGP routers in the AS.

C.

Route reflectors disable iBGP split horizon for all iBGP peers in the AS.

D.

Route reflectors do not work in conjunction with confederations.

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Question 2

Click the exhibit.

Routers RR1 and RR2are route reflectors with clients R1x and R2x, respectively. Routers RR1

and RR2 are non-clients of each other, and router R1 is a non-client of both. Which of the following regarding BGP sessions in AS 65540 is TRUE?

Options:

A.

Router R1must have at least one BGP session to each of routers R1x and R2x.

B.

Routers R1, RR1 and RR2 must be fully meshed.

C.

Routers R1x and R2x must have at least one BGP session between them.

D.

Routers R1x as well as routers R2x must be fully meshed.

Question 3

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

Question 4

Click the exhibit.

Router R6 is a route reflector with clients R1, R2 and R5. Router R3 advertises the prefix 192.168.1.0/27 to routers R1, R2 and R5. How many routes for prefix 192.168.1.0/27 will router R6 receive?

Options:

A.

1

B.

2

C.

3

D.

None

Question 5

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

Options:

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".

Question 6

The user of an Alcatel-Lucent 7750 SR wants to see the effect of changing an import policy immediately. What is the best command to force re-evaluation of the import policy with minimal impact?

Options:

A.

Configure router bgp shutdown

B.

Clear router bgp neighbor soft

C.

Clear router bgp neighbor soft-inbound

D.

Clear router bgp protocol

Question 7

Click the exhibit.

AS 65550 owns the CIDR block 10.64.0.0/12. Router R4 advertises the aggregate 10.64.0.0/12 to AS65540. Which of the following is TRUE regarding the aggregate route advertisement?

Options:

A.

The aggregator attribute will not be present, and the atomic aggregate flag will not be set.

B.

The aggregator attribute will not be present, and the atomic aggregate flag will be set.

C.

The aggregator attribute will be present, and the atomic aggregate flag will not be set.

D.

The aggregator attribute will be present, and the atomic aggregate flag will be set.

Question 8

Click the exhibit.

Assuming that none of the routers within AS 65200 is configured with next-hop-self", what will the BGP update for the 192.168.0.1/27 prefix 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 E.

D.

AS Path of 65100, Next Hop of router A.

Question 9

An Alcatel-Lucent 7750 SR has the BGP configuration shown below. Assuming the router has established BGP sessions to routers R1 and R2, which of the following is TRUE?

Options:

A.

Both neighbors R1and R2 should be part of AS 65540.

B.

Neighbor R1should be part of AS 65550, while neighbor R2 should be part of AS 65540.

C.

Neighbor R1should be part of AS 65550, while neighbor R2 should be part of AS 65560.

D.

Both neighbors R1and R2 should be part of AS 65560.

Question 10

What kind of BGP attribute is the Local Preference?

Options:

A.

Optional transitive attribute.

B.

Optional non-transitive attribute.

C.

Well-known mandatory attribute.

D.

Well-known discretionary attribute.

Question 11

Click the exhibit.

After router A receives the BGP update for the 10.3.3.0/24 prefix, which routers will the route be propagated to?

Options:

A.

All routers with which it has a BGP session.

B.

All routers with which it has a BGP session, except the router it received the update from, which is router B.

C.

All routers with which it has a BGP session, except the router it received the update from, which is router C.

D.

All routers with which it has a BGP session, except the router it received the update from, which is router D.

E.

Only eBGP neighbors.

Question 12

What class of attribute is Originator_ID?

Options:

A.

Well-known mandatory.

B.

Well-known discretionary.

C.

Optional transitive.

D.

Optional non-transitive.

Question 13

Which of the following regarding BGP Path Identifier is FALSE?

Options:

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.

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?

Options:

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.

Question 15

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 the ISPs?

Options:

A.

ISP 1 and ISP 2 have a public transit relationship, while ISP 3 and ISP 4 have a private transit relationship.

B.

ISP 1 and ISP 2 have a private transit relationship, while ISP 3 and ISP 4 have a public transit relationship.

C.

ISP 1 and ISP 2 have a private peering relationship, while ISP 3 and ISP 4 have a public peering relationship.

D.

ISP 1 and ISP 2 have a public peering relationship, while ISP 3 and ISP 4 have a private peering relationship.

Question 16

Click the exhibit.

Over which BGP session will router B learn the 10.1.1.0/24 prefix?

Options:

A.

The session between router A and router B.

B.

The session between router C and router B.

C.

The session between router D and router B.

D.

Router B will learn the prefix over all of the sessions, then it will choose the best route.

Question 17

Which of the following regarding route reflectors is TRUE?

Options:

A.

Only the route reflector is configured with a cluster id.

B.

There can only be one route reflector in a cluster.

C.

Clients should have iBGP sessions with each other to maintain the mesh.

D.

There can only be one level of route reflectors in the topology.

Question 18

Which of the following prefix-lists is the most specific match for prefix 172.31.2.1/24?

Options:

A.

Prefix 172.16.0.0/12 longer.

B.

Prefix 172.31.0.0/22 longer.

C.

Prefix 172.31.0.0/23 longer.

D.

Prefix 172.31.0.0/24 exact.

Question 19

Which of the following regarding BGP confederations is FALSE?

Options:

A.

The entire confederation is viewed as a single AS by an eBGP peer.

B.

Within a confederation, each member AS is considered as a stand-alone AS.

C.

Member ASs within a confederation can use route reflection.

D.

Member ASs must be fully meshed within a confederation.

Question 20

Click the exhibit.

Router R2 receives a route to 192.168.4.0/29 from router R4 and sets the local preference to 110.

Router R1 receives the route to 192.168.4.0/29 from router R3, and sets the local preference to

80. There is a full iBGP mesh in AS 65540, but router R5 only has a physical connection to router R1. Which path does traffic destined to 192.168.4.0/29 take from router R5?

Options:

A.

R5-R2-R4-R8

B.

R5-R1-R3-R4-R8

C.

R5-R1-R2-R4-R8

D.

R5-R1-R3-R7-R8

Question 21

Click the exhibit.

Routers RR1 are RR2 are redundant route reflectors for clients R3 and R4. Which of the following is a valid configuration on router R3?

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

Question 22

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?

Options:

A.

1

B.

2

C.

3

D.

4

Exam Detail
Vendor: Nokia
Certification: SRC Certification
Exam Code: 4A0-102
Exam Name: Nokia Border Gateway Protocol
Last Update: Dec 25, 2024
4A0-102 Question Answers
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Total 152 questions
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