4A0-102 NokiaBorder Gateway Protocol Questions and Answers

Router R3 rejects all updates originating in AS 65540.

Router R3 accepts updates received from router R1 and rejects updates transited through router R2.

Router R3 accepts updates transited through router R2 and rejects updates received from router R1.

Router R3 accepts updates from both routers R1 and R2.

eBGP peers typically use system addresses for session establishment.

eBGP peers are managed under a single administration.

eBGP peers do not propagate updates learned via iBGP.

eBGP peers are usually directly connected to each other.

An AS is a set of routers under a single technical administration.

An AS efficiently advertises all IGP known routes to other ASs.

An AS presents a consistent routing policy to other autonomous systems.

An AS has a 2-byte or 4-byte AS number assigned.

On router R5 only.

On either router R1or R2.

On both routers R1and R2.

On all routers R1, R2 and R5.

Core and edge node failure recovery depends on IGP convergence.

Edge neighbor failure is detected by the eBGP session timeout.

BGP control plane convergence is independent of number of affected prefixes.

Upon BGP control plane convergence, an optimal path is installed in the FIB.

Two primary paths and one backup path.

One primary path and two backup paths.

Three primary path and one backup path,

Three primary paths.

140000 137000

137000 140000

23456 23456

200 140000 137000

Option A

Option B

Option C

Option D

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

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

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

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

Prefix list 192.168.0.0/16 through 18.

Prefix 192.168.0.0/17 longer.

Prefix list 192.168.0.0/17 through 18.

Prefix 192.160.0.0/13 longer.

R1-R3-R8

R1-R2-R4-R8

R1-R3-R4-R8

R1-R2-R4-R3-R8

140000 200 135000

137000 140000 200 135000

140000 23456 135000

135000 200 140000

Routers R1, R2, R3, R4 and R5.

Routers R1and R4 only.

Routers R1, R2, R3 and R4 only.

Routers R1, R4 and R5 only.

Router C sends the update to routers E and F only.

Router C sends the update to routers D, E and F.

Router C sends the update to routers A, B, E and F.

Router C sends the update to routers A, B, D, E and F.

config > router- confederation 65200 members 65202

config > router > bgp= confederation 65200 members 65202

config > router= confederation 65202 members 65200

config > router > bgp= confederation 65202 members 65200

".+ 65100"

"65100.+"

".* 65100.*"

"65100"

Next Hop is modified when crossing member AS boundaries within a confederation.

Origin Code is modified when crossing member AS boundaries within a confederation.

AS Path is modified when crossing member AS boundaries within a confederation.

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

A route received from a BGP peer within the same AS.

A route originated by a router in a different cluster of the same AS.

A route received from a BGP peer from a different member AS of a confederation.

A route received from a BGP peer from the same member AS of a confederation.

OpenSent

Keepalive

Open

Notification

Update

Authentication is performed before establishing the BGP session.

Authentication can only be configuredon the group or neighbor level.

By default, MD5 authentication is disabled.

Peer authentication may be optionally requested in an open message.

The update is sent to router R2 in ISP 1.

The update is sent to routers R2 and R3 in ISP 1.

The update is sent to all routers in ISP 1.

The update is sent to routers R2 and R3 in ISP 1, and to router R3 in ISP 2.

Option A

Option B

Option C

Option D

Origin, Next Hop and Local Preference.

Local preference, AS Path and Next Hop.

Aggregator, Next Hop and AS Path.

AS Path, Next Hop and Origin.

Option A

Option B

Option C

Option D

Option A

Option B

Option C

Option D

100

The IGP cost

500

None

Route reflectors propagate BGP learned routes to their clients.

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

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

Route reflectors do not work in conjunction with confederations.

Option A

Option B

Option C

Option D

A single route for 192.168.0.0/16 is advertised.

BGP routes 192.168.1.0/27, 192.168.2.0/27, and 192.168.0.0/16 are advertised.

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.

The given export policy is invalid.

An update message is used. Only a single prefix can be withdrawn at a time.

An update message is used. Multiple prefixes can be withdrawn at a time.

A withdraw message is used. Only a single prefix can be withdrawn at a time.

A withdraw message is used. Multiple prefixes can be withdrawn at a time.

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

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

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

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

Option A

Option B

Option C

Option D

Optional transitive attribute.

Optional non-transitive attribute.

Well-known mandatory attribute.

Well-known discretionary attribute.

The routes are in the RIB-In.

The routes are in the Loc-RIB.

The routes are in the RIB-Out.

The routes are not in any of the BGP databases.

The AS Path is set to 65540, and the Atomic Aggregate flag is set.

The AS Path is set to 65540 65550, and the Atomic Aggregate flag is set.

The AS Path is set to 65540 65550, and the Atomic Aggregate flag is not set.

The AS Path is set to 65550, and the Atomic Aggregate flag is not set.

To protect external networks from instability.

To communicate the architecture of an AS to external ASs.

To protect the local AS and other external ASs from bad NLRI.

To optimize ingress and egress traffic patterns to best serve the users of the AS.

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

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

AS Path of 65100, Next Hop of router A.

AS Path of 65100, Next Hop of router E.

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

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

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

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

Prefix 172.16.0.0/12 longer.

Prefix 172.31.0.0/22 longer.

Prefix 172.31.0.0/23 longer.

Prefix 172.31.0.0/24 exact.

Advertising external networks into IGP.

Using system addresses for setting up iBGP sessions.

Exporting the networks associated with the external links of eBGP peers into BGP.

Optimizing BGP route table by exporting IGP routes into BGP.

There can only be one community associated with a route.

Community is an optional non-transitive attribute.

Community is an optional transitive attribute.

Community is a well-known discretionary attribute.