BGP Cheat Sheet

Question 1

What ranges are globally unique AS numbers and which are private AS numbers for BGP

Answer 1

Range 1-64511 is globally unique

Range 64512-65535 is private

Question 2

What type of protocol is BGP

Answer 2

Path Vector

Question 3

List the neighbor states and describe each for BGP

Answer 3

Idle: Neighbor is not responding

Active: Attempting to connect

Connect: TCP session established

Open Sent: Open message sent

Open Confirm: Response received

Established: Adjacency established

Question 4

Differences between Single Homed, Dual Homed, Single Multi-Homed and Dual Multi-Homed

Answer 4

The first Single/Dual word is for the number of links. The second Homed/Multi-homed represent multiple ISPs

Question 5

What type of authentication does BGP use?

Answer 5

MD5