BGP

Question 1

The IP address space is maintained by who

Answer 1

IANA (Internet Assigned Number Authority). IANA assigned address to Large Regional Registry like RIPE and ARIN.

Question 2

What is the public range of ASN

Answer 2

range 1-64511

Question 3

What is the Private ANS range

Answer 3

64512-65535

Question 4

What port does BGP use?

Answer 4

TCP 179

Question 5

How to configure BGP Neighborship between routers. use FA0/0 address as neighbor address.

Answer 5

Question 6

How do you enable MD5 Authentication in BGP?

Answer 6

Question 7

How do you advertise a network into BGP?

Answer 7

Question 8

How does eBGP avoid routing loops?

Answer 8

BGP uses the AS_PATH attribute to avoid routing loops. A prefix will not be accepted by a eBGP router if it sees its own AS number in it

Question 9

How does iBGP avoid loops?

Answer 9

iBGP Split Horizon.

iBGP does not readvertise BGP routes to iBGP neighbors. you need to setup a Full Mesh to get routes from R3 to R1.

Question 10

What does Origin code “i” stand for?

What does Origin code “?” stand for?

Answer 10

network 4.4.4.4 mask 255.255.255.255

This network was advertised into BGP using the network command.

The “?” means that the route has been redistributed into BGP

Question 11

What does the * and > stand for?

Answer 11

* = valid path

> = best path and install into the routing table

Question 12

What are the 6 different “states” when two BGP routers try to become neighbors

Answer 12