Chapter 12 - Advanced BGP

Question 1

AS path access control list (ACL)

Answer 1

An ACL based on regex for identifying BGP routes based on the AS path and used for direct filtering or conditional matching in a route map.

Question 2

BGP community

Answer 2

A well-known BGP attribute that allows for identification of routes for later actions such as identification of source or route filtering/modification.

Question 3

BGP multihoming

Answer 3

A method of providing redundancy and optimal routing that involves adding multiple links to external autonomous systems.

Question 4

distribute list

Answer 4

A list used for filtering routes with an ACL for a specific BGP neighbor.

Question 5

prefix list

Answer 5

A method of selecting routes based on binary patterns, specifically the high-order bit pattern, high-order bit count, and an optional prefix length parameter.

Question 6

regular expression (regex)

Answer 6

Search patterns that use special key characters for parsing and matching.

Question 7

route map

Answer 7

A feature used in BGP (and other IGP components) that allows for filtering or modification of routes using a variety of conditional matching.

Question 8

transit routing

Answer 8

The act of allowing traffic to flow from one external autonomous system through your autonomous system to reach a different external autonomous system.