Question 1.
What BGP function should you use to influence the path that your iBGP speakers will use to select the preferred exit point from your AS?

a) Multi-exit discriminator (MED)
b) AS path prepending
c) Local preference
d) weight

Answer

Question 2.
What BGP protocol message confirms that peering has been established in response to an OPEN message?

a) OPEN confirmation
b) UPDATE
c) NOTIFICATION
d) KEEPALIVE

Answer

Question 3.
What are attributes of the current definition of AS?

a) A set of routers and addresses under one administration
b) A set of routers and addresses that presents a common global routing policy
c) A set of routers and addresses that use the same IGP
d) A set of routers and addresses under one or more administrations

Answer

Answers

Question 1.
What BGP function should you use to influence the path that your iBGP speakers will use to select the preferred exit point from your AS?

a) Multi-exit discriminator (MED)
b) AS path prepending
c) Local preference
d) weight

Answer
b) AS path prepending
c) Local preference

Explanation
Like AS prepending, MED and AS are intended to affect preference in AS other than yours. AS path prepending is a basic and direct mechanism to make paths more or less preferable to a distant (i.e., not directly connected) AS. The MED can only affect directly connected external AS.

Local preference does not propagate outside your AS, but all iBGP speakers will hear it. Weight is a Cisco-specific attribute that does not go beyond the router on which it is configured.

While BGP communities are not directly part of the route selection algorithm, you can set administrative weight or local preference based on community information.
[3009]

CCIE Topic(s): E
CCIE Objective(s): E2
CCNA Topic(s):
CCNA Objective(s):

Question 2.
What BGP protocol message confirms that peering has been established in response to an OPEN message?

a) OPEN confirmation
b) UPDATE
c) NOTIFICATION
d) KEEPALIVE

Answer
b) UPDATE
d) KEEPALIVE

Explanation
BGP does not have a specific message that confirms that the connection is established. Instead, you will receive a message that assumes normal operation of the connection, either UPDATE or KEEPALIVE. NOTIFICATION is used only for severe errors.
[3010]

CCIE Topic(s): E
CCIE Objective(s): E2
CCNA Topic(s):
CCNA Objective(s):

Question 3.
What are attributes of the current definition of AS?

a) A set of routers and addresses under one administration
b) A set of routers and addresses that presents a common global routing policy
c) A set of routers and addresses that use the same IGP
d) A set of routers and addresses under one or more administrations

Answer
b) A set of routers and addresses that presents a common global routing policy
d) A set of routers and addresses under one or more administrations

Explanation
While the original BGP specifications described an AS as "a set of routers under common administration," the practical definition of an AS moved out of the BGP standards proper. RFC1930 gives the best current guidelines, which consider an AS to be a set of routers (and addresses), under one or more administrations, that announces a common routing policy to the Internet.

Choice_C is an obsolete definition, as is Choice_A. Be aware that Cisco uses the old definition when referring to the process identifier on IGRP and EIGRP.
[3011]

CCIE Topic(s): E
CCIE Objective(s): E2
CCNA Topic(s):
CCNA Objective(s):