BGP Fundamentals

Question 1

What does BGP stand for?

Answer 1

Border Gateway Protocol

Question 2

Why was BGP developed?

Answer 2

To solve routing issues around the decentralized and massive scale nature of the internet.

Question 3

Over which protocol and port does BGP operate?

Answer 3

TCP

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Question 4

What does BGP do at a high level?

Answer 4

It provides dynamic discovery and routing of peered networks

Question 5

Is BGP interconnecting a manual or automatic process?

Answer 5

It is a manual process, by design.

Question 6

Does BGP use link-state, distance-vector, or Path-vector in determining the best path?

Answer 6

Path-vector

Question 7

What is link-state?

Answer 7

Calculates the best path by using information about interconnected devices.

Question 8

What is distance-vector?

Answer 8

Routers inform direct neighbors about topology changes to calculate the best path.

Question 9

True or False: BGP shares all available paths with its neighbors.

Answer 9

False. Only the best path is shared with neighbors.

Question 10

What is an Autonymous System (AS)?

Answer 10

A set of routers under a single technical administration

Question 11

What BGP routing protocol is used for routes to different autonymous systems?

Answer 11

EBGP - External BGP

Question 12

What BGP routing protocol is used for routes within an autonymous system?

Answer 12

IBGP - Internal BGP

Question 13

How does BGP choose the path to take from the path list?

Answer 13

by weight. The higher the number, the higher the preference. [ 10.3.0.0/16 | 0.0.0.0 | 32,768 | i

Question 14

How can route influencing be accomplished for routers within an AS?

Answer 14

By manually increasing or decreasing the weight assigned to a path

Question 15

How can route influencing be accomplished for routers between AS?

Answer 15

by manually prepending routes, making it appear as though the number of hops required is less or more than what is actually is