SRA BGP for Internet Routing Practice Questions & Answers • ExamPrepare

Question 1

Which of the following statements about BGP shortcuts is FALSE?

MPLS tunnels are used to carry transit traffic across the network.
A full mesh of iBGP peering sessions is not required.
Edge and transit routers need to be configured with BGP.
The transit routers need to support LDP or RSVP-TE LSPs.

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Question 2

Which of the following statements about the 16-bit public AS numbers is FALSE?

They are allocated to the RIRs by ICANN/IANA.
They are used when connecting ASs on the Internet.
They range from 1 to 56319.
They are assigned by the ISPs for enterprise networks.

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Question 3

Which of the following statements about BGP FRR is FALSE?

The router must receive updates from multiple BGP speakers to compute a backup path.
BGP FRR can be triggered by BFD.
The backup path can use the same next-hop as the primary path.
BGP peer-tracking can be used to improve BGP FRR failure detection times.

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Question 4

Two Nokia 7750 SRs are established BGP peers with the following add-paths configuration:

R1: configure router bgp add-paths ipv4 send 4

R2: configure router bgp add-paths ipv4 send 2 receive true

If router R1 advertises three routes for a given prefix X, how many routes is router R2 expected to have for prefix X?

None
2
3
4

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Question 5

Router R6 is a route reflector for clients R1, R2, and R5 which advertise routes learned 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 true". Which routes to 192.168.0.1/27 is router R4 expected to have in its BGP routing table?

The routes from routers R1, R2, and R5.
The routes from routers R1 and R2.
The routes from routers R2 and R5.
Two routes are chosen at random and advertised to router R4.

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Question 6

Router R1 is a route reflector with clients R2, R5, and R6. Router R3 advertises the prefix 192.168.1.0/27 to routers R5 and R6. Assuming that routers R1, R2, and R4 are configured with "add-paths ipv4 send 2 receive", what is the expected output of "show router bgp routes" when executed on router R4?

Flag Network LocalPref MED Nexthop (Router) Path-Id Label As-Path ------------------------------------------------------------------------------- u*>i 192.168.1.0/27 None None 10.10.10.5 1 - 65540 65541 *i 192.168.1.0/27 None None 10.10.10.6 2 - 65540 65541
Flag Network LocalPref MED Nexthop (Router) Path-Id Label As-Path ------------------------------------------------------------------------------- u*>i 192.168.1.0/27 None None 10.10.10.5 None - 65540 65541 *i 192.168.1.0/27 None None 10.10.10.6 None - 65540 65541
Flag Network LocalPref MED Nexthop (Router) Path-Id Label As-Path ------------------------------------------------------------------------------- u*>i 192.168.1.0/27 None None 10.10.10.2 1 - 65540 65541 *i 192.168.1.0/27 None None 10.10.10.2 2 - 65540 65541
Flag Network LocalPref MED Nexthop (Router) Path-Id Label As-Path ------------------------------------------------------------------------------- u*>i 192.168.1.0/27 None None 10.2.4.2 2 - 65540 65541 *i 192.168.1.0/27 None None 10.2.4.2 1 - 65540 65541

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