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4A0-102 Practice Exam Questions and Answers

Nokia Border Gateway Protocol

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Total Questions : 152

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Question # 1

Why is a full mesh of iBGP peers required?

Options:

A.  

To ensure proper route propagation inside a transit AS.

B.  

To ensure that all routers are directly connected.

C.  

To ensure that all routers run iBGP inside a transit AS.

D.  

To maximize control plane scalability.

Discussion 0
Question # 2

An Alcatel-Lucent 7750 SR receives two updates for the same route with local preferences 200 and 300, respectively. What local preference is sent to eBGP peers?

Options:

A.  

100

B.  

200

C.  

300

D.  

None

Discussion 0
Question # 3

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

Discussion 0
Question # 4

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.

Discussion 0
Question # 5

Which of the following is the minimum requirement for an AS to be considered multi-homed?

Options:

A.  

A single connection to a single service provider.

B.  

Two connections to a single service provider.

C.  

Two connections to two different service providers.

D.  

Multiple connections to different service providers.

Discussion 0
Question # 6

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

Options:

A.  

They are allocated to the RIRs by ICANN/IAN

A.  

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.

Discussion 0
Question # 7

Click the exhibit.

Question # 7

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 R8?

Options:

A.  

65200 (65206 65202) 65100

B.  

(65206 65202)65100

C.  

65250 (65206 65202) 65100

D.  

65200 65100

Discussion 0
Question # 8

Click the exhibit.

Question # 8

Router R6 is a route reflector for clients R1, R2 and R5 with local preferences 100, 200 and 500 respectively. Router R3 advertises prefix 192.168.1.0/27 to routers R1, R2 and R5 which are configured with advertise-external. Routers R4 and R6 are both configured with "add-paths ipv4 send 2 receive". Which routes to 192.168.0.1/27 is router R4 expected to have in its BGP routing table?

Options:

A.  

The routes from routers R1, R2 and R5.

B.  

The routes from routers R1and R2.

C.  

The routes from routers R2 and R5.

D.  

Two routes are chosen at random and advertised to router R4.

Discussion 0
Question # 9

Click the exhibit.

Question # 9

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

Options:

A.  

AS Path of 65200, local-preference of 100.

B.  

AS Path of 65200, local-preference of None.

C.  

Null AS Path, local-preference of 100.

D.  

Null AS Path, local-preference of None.

Discussion 0
Question # 10

Click the exhibit.

Question # 10

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.

Discussion 0
Question # 11

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

Question # 11

Options:

A.  

"client1" routes will be tagged with communities "North" and "West".

B.  

"client1" routes will be tagged with community "West".

C.  

"client1" routes will be tagged with community "North".

D.  

"client1" routes will be rejected.

Discussion 0
Question # 12

How are policy direction and data flow related on the Alcatel-Lucent 7750 SR?

Options:

A.  

Import policies affect ingress data flow.

B.  

Export policies affect ingress data flow.

C.  

Both import and export policies affect ingress data flow.

D.  

Policy direction and data flow are independent.

Discussion 0
Question # 13

Click the exhibit.

Question # 13

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.

Discussion 0
Question # 14

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

Discussion 0
Question # 15

Which of the following commands would correctly configure the confederation AS number as 65200 with a member AS of 65202?

Options:

A.  

config>router- confederation 65200 members 65202

B.  

config>router>bgp= confederation 65200 members 65202

C.  

config>router= confederation 65202 members 65200

D.  

config>router>bgp= confederation 65202 members 65200

Discussion 0
Question # 16

Click the exhibit.

Question # 16

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

Question # 16

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.

Discussion 0
Question # 17

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 FI

B.  

C.  

BGP Fast Reroute is independent of number of affected prefixes.

D.  

BGP Fast Reroute uses the optimal path to the destination.

Discussion 0
Question # 18

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

Options:

A.  

1

B.  

32

C.  

64

D.  

255

Discussion 0
Question # 19

A router receives two routes from its neighbors: a route from OSPF for 10.0.0.0/24, and a route from BGP for 10.0.0.0/8. Both routes have reachable next hops. Which of the following is TRUE?

Options:

A.  

Only the BGP route is in the route table.

B.  

Both routes are in the route table.

C.  

None of the routes is in the route table.

D.  

Only the OSPF route is in the route table.

Discussion 0
Question # 20

Which of the following is TRUE if a BGP session state is Connect?

Options:

A.  

BGP is waiting for the TCP connection to be completed.

B.  

BGP has established a TCP connection, and an Open message has been sent to that neighbor.

C.  

The BGP session has been interrupted, and a TCP connection is being re-established.

D.  

BGP has failed to establish a TCP connection to that neighbor, and ConnectRetry has been reset to zero.

Discussion 0
Question # 21

From what range are 16-bit private AS numbers selected?

Options:

A.  

64496 – 64511

B.  

1 – 56319

C.  

64512-65534

D.  

64513-65535

E.  

There are no defined private AS numbers; there are only private IP addresses.

Discussion 0
Question # 22

Click the exhibit.

Question # 22

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

Options:

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.

Discussion 0
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