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  • Exam Name: NokiaBorder Gateway Protocol
  • Last Update: Jun 18, 2024
  • Questions and Answers: 149
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4A0-102 Practice Exam Questions with Answers NokiaBorder Gateway Protocol Certification

Question # 6

AnNokia7750 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?

4A0-102 question answer

A.

Both neighbors R1and R2should 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.

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Question # 7

Click the exhibit.

4A0-102 question answer

Which of the following is a valid BGP configuration for router R2?

4A0-102 question answer

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Question # 8

A confederated AS is comprised of three members. One member is comprised of 4 routers, while the other two members are comprised of 3 routers each. Assuming member ASs are fully meshed and use full mesh iBGP, what is the required number of BGP sessions within the confederation?

A.

12

B.

13

C.

14

D.

15

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Question # 9

What are the well-known mandatory BGP attributes?

A.

Origin, Next Hop and Local Preference.

B.

Local preference, AS Path and Next Hop.

C.

Aggregator, Next Hop and AS Path.

D.

AS Path, Next Hop and Origin.

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Question # 10

The configuration of anNokia7750 SR is given below. Router Rl has established BGP sessions with routers R2 and R3. Which of the following is TRUE?

4A0-102 question answer

A.

Router R1forms an iBGP session with router R2, and aneBGP session with router R3.

B.

Router R1forms iBGP sessions with routers R2 and R3.

C.

Router R1forms eBGP sessions with routers R2 and R3.

D.

The types of BGP sessions with routers R2 and R3 cannot be determined.

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Question # 11

Click the exhibit.

4A0-102 question answer

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?

A.

140000 200 135000

B.

137000 140000 200 135000

C.

140000 23456 135000

D.

135000 200 140000

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Question # 12

Click the exhibit.

4A0-102 question answer

Assuming a fulliBGP 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 sentto routers R2 and R3 in ISP 1, and to router R3 in ISP 2.

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Question # 13

What isthe result of configuring the following policy statement as a BGP import policy on theNokia7750 SR?

4A0-102 question answer

A.

All BGP routes are accepted.

B.

All routes matching prefix lists "List-1" and "List-2" are rejected.

C.

BGP routes matching prefix lists "List-1" or "List-2" are rejected.

D.

BGP routes matching prefix lists "List-1" and "List-2" are rejected.

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Question # 14

Based on the default settings for theNokia7750 SR, when a policy change is made and committed, what action is required by the user for the change to takeeffect?

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.

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Question # 15

A router in AS 65100 receives three routes for 138.120.0.0/16. The first route has an AS Path of65200 65400 65300 and a local preference of 150. The second route has an AS Path of 65200 65300 and a local preference of 100. The third route has an AS path of 65600 65300 and a local preference of 200. Which route will appear in the RIB-In?

A.

Only thefirst route will appear in the RIB-In.

B.

Only the second route will appear in the RIB-In.

C.

Only the third route will appear in the RIB-In.

D.

All routes will appear in the RIB-In.

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Question # 16

Click the exhibit.

4A0-102 question answer

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 # 17

Click the exhibit.

4A0-102 question answer

Router R1 is a route reflector withclients 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 router R6 is configured with "advertise-external", what is the expected output of "show router bgp routes" when executed on router R1?

4A0-102 question answer

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Question # 18

Which of thefollowing is NOT a BGP message type?

A.

Route-Refresh

B.

OpenSent

C.

Notification

D.

Update

E.

Keepalive

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Question # 19

Click the exhibit.

4A0-102 question answer

AS 65550 owns CIDR block 10.64.0.0/12. Router R3 is advertising Client1 and Client2 networks into BGP. Router R6 advertises the aggregate 10.64.0.0/12 to AS 65541 with"summary-only" enabled. Which of the following routes are received by router R7?

A.

Client1, Client2 and the aggregate.

B.

Only the aggregate.

C.

Only Client1 and the aggregate.

D.

Only Client2 and the aggregate.

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Question # 20

Click the exhibit.

4A0-102 question answer

AS 65100 isadvertising 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 R8?

A.

65200 (65206 65202) 65100

B.

(65206 65202)65100

C.

65250 (65206 65202) 65100

D.

65200 65100

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Question # 21

The user of anNokia7750 SR wantsto 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?

A.

Configure router bgp shutdown

B.

Clear router bgp neighbor soft

C.

Clear router bgp neighbor soft-inbound

D.

Clear router bgp protocol

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Question # 22

Click theexhibit.

4A0-102 question answer

Assume all router-IDs are properly configured, and global IPv6 addresses are used to establish eBGP sessions. Which of the following configurations is required on router A so that router B can exchange traffic with router D?

4A0-102 question answer

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Question # 23

Click the exhibit.

4A0-102 question answer

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.

Thesession 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 # 24

Click the exhibit.

4A0-102 question answer

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 # 25

Which of thefollowing statements regarding route reflectors is TRUE?

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 # 26

Click the exhibit.

4A0-102 question answer

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?

4A0-102 question answer

A.

10.0.2.1

B.

10.0.2.2

C.

10.16.10.1

D.

10.16.10.3

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Question # 27

Click on the exhibit.

4A0-102 question answer

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?

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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Question # 28

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

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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Question # 29

Which of the following is TRUE?

A.

There can only be one communityassociated with a route.

B.

Community is an optional non-transitive attribute.

C.

Community is an optional transitive attribute.

D.

Community is a well-known discretionary attribute.

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Question # 30

Click the exhibit.

4A0-102 question answer

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?

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.

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Question # 31

Which of the following regarding "well-known discretionary'' BGP attributes is TRUE?

A.

They must be recognized by all peers and included in all BGP updates.

B.

They arediscarded if not recognized by the recipient.

C.

They must be recognized by all peers and optionally included in BGP updates.

D.

The receiving router sends a notification if a well-known discretionary attribute is not present in an update.

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Question # 32

A router in AS 65100 receives two BGP routes. The first route is for138.1.1.0/24 with an AS Path of 65200 65300, Local Preference of 100, MED of 100, and router ID 10.10.10.10. The second route is for 138.1.0.0/16 with an AS Path of 65500 65300, Local Preference of 150, MED of 100, and router ID 10.1.1.1. Assuming all other attributes are equal, which route would be used to forward an IP packet with destination IP address 138.1.1.1?

A.

The first BGP route.

B.

The second BGP route.

C.

Both routes are used.

D.

It is impossible to determine without the value of the origin code for both routes.

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Question # 33

Click the exhibit.

4A0-102 question answer

Assume all router-IDs are properly configured, and IPv6 link-local addresses are used to establish all eBGP sessions. Given the following iBGP configuration on router A, what is the Next Hop forprefix 2001:DB8:A:401::1/128 on router B?

4A0-102 question answer

A.

The IPv6 link-local address of the router D interface towards router A.

B.

The IPv6 link-local address of the router A interface towards router D.

C.

The IPv6 global address of router A.

D.

The IPv6 globaladdress of router D.

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Question # 34

Click the exhibit.

4A0-102 question answer

Router R1 is a route reflector with clients R2, R5 and R6. Prefixes advertised by router R5have 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 R1?

4A0-102 question answer

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Question # 35

What kind of attribute is the aggregator?

A.

Well-known mandatory

B.

Well-known discretionary

C.

Optional transitive

D.

Optionalnon-transitive

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Question # 36

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

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 aconfederation.

D.

None of the well known mandatory attributes is modified within a confederation.

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Question # 37

Which of the following is FALSE regarding the 16-bit public autonomous system numbers?

A.

They are allocated to the RIRs by ICANN/IANA.

B.

They are used when connecting ASs on the Internet.

C.

They range from 1 to 56319.

D.

They are assigned by the ISPs for enterprise networks.

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Question # 38

Click the exhibit.

4A0-102 question answer

Routers RR1 and RR2 are route reflectors with the same Cluster-ID. When the update for prefix

192.168.1.0/27 is received at router RA2, what are the Originator_ID and Cluster_List attributes?

A.

Originator_ID of RR1; and Cluster_List of 10.16.10.1.

B.

Originator_ID of RX; and Cluster_List of 10.16.10.1.

C.

Originator_ID of RR1; and the Cluster_List is not set.

D.

Neither the Originator_ID nor the Cluster_List is set.

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Question # 39

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 # 40

Click the exhibit.

4A0-102 question answer

Router R6 is a route reflector for clients R1, R2 and R5. Router R5 is configured with a local preference of 200. On which routers is "advertise-external* needed for router R6 to receive exactly two distinct routes for prefix 192.168.1.0/27?

A.

On router R5 only.

B.

On either router R1or R2.

C.

On both routers R1and R2.

D.

On all routers R1, R2 and R5.

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Question # 41

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

A.

Import policies affect the way thelocal 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 thelocal 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.

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Question # 42

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

4A0-102 question answer

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", andentries 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".

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Question # 43

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

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Question # 44

AnNokia7750 SR is configured with a local preference of 250. If it receives a BGP update with a local preference of 500, what local preference is sent to its eBGP peers?

A.

100

B.

250

C.

500

D.

None

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