642-902 Q&A – Implement an eBGP based solution (11-15)

Section 3 – Implement an eBGP based solution, given a network design and a set of requirements

QUESTION NO: 11
Refer to the exhibit. Which statement is true? Select the best response.

11

A. Router RAR1 will accept only route 10.10.0.0/19 from its BGP neighbor.
B. Router RAR1 will send only route 10.10.0.0/19 to its BGP neighbor.
C. Only traffic with a destination from 10.10.0.0/19 will be permitted.
D. Only traffic going to 10.10.0.0/19 will be permitted.
Answer: A

QUESTION NO: 12
Which BGP command provides the router ID, local preference, next hop, and BGP path in its output? Select the best response.
A. show ip route bgp
B. show ip bgp
C. show ip bgp neighbors
D. show ip bgp summary
Answer: B

QUESTION NO: 13
Refer to the exhibit. A client has asked you to consult on an eBGP loading question. Currently the AS 100 eBGP links have an average outbound load of 65% and 20% respectively. On further investigation, traffic from 10.10.24.0 accounts for 45%, and 10.10.25.0 and 10.10.32.0 accounts for 20% each of the outbound load. The customer wants to spread the load between the two eBGP links more evenly. The BGP attributes are currently set at their default values.
If you are located at AS 100 and want to influence how AS 100 sends traffic to AS 200, what BGP attribute could you configure to cause AS 100 outbound traffic to load the eBGP links more evenly?
Select the best response.

13
A. On router A, set the default local-preference to 50.
B. On router B, set the default metric to 150.
C. On router B, configure a route map for 10.10.25.0/24 with a local preference of 150 linked to neighbor 192.168.30.2.
D. On router B, set the default local-preference to 150.
Answer: C

QUESTION NO: 14
Based on the show ip bgp summary output, which two statements are true? (Choose two.)

14
A. The BGP session to the 10.1.1.1 neighbor is established.
B. The BGP session to the 10.2.2.2 neighbor is established.
C. The BGP session to the 10.3.3.3 neighbor is established.
D. The router is attempting to establish a BGP peering session with the 10.1.1.1 neighbor.
E. The BGP session to the 10.3.3.3 neighbor is established, but the router has not received any BGP
routing updates from the 10.3.3.3 neighbor.
F. The router is attempting to establish a BGP peering session with the 10.2.2.2 neighbor.
Answer: AF
Explanation:
In BGP, established valid neighbors will have a number under the state/pfxRcd heading.
Neighbors that show an active state mean that the router is actively trying to establish a peering relationship. Idle peers are not active, and not actively trying to peer. In this case, only the peer to 10.1.1.1 is currently operational with two route prefixes received, while the peer to 10.2.2.2 is trying to become established.

QUESTION NO: 15
Which statement is true about EBGP? Select the best response.
A. An internal routing protocol can be used to reach an EBGP neighbor.
B. The next hop does not change when BGP updates are exchanged between EBGP neighbors.
C. A static route can be used to form an adjacency between neighbors.
D. EBGP requires a full mesh.
Answer: C
Explanation:
When BGP is running between routers in different autonomous systems, it is called External BGP (EBGP). When BGP is running between routers in the same AS, it is called Internal BGP (IBGP).
BGP allows the path that packets take to be manipulated by the AS, as described in this module. It is important to understand how BGP works to avoid creating problems for your AS as a result of running BGP.

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