Loopback interface

Question 1

what is loopback interface used for?

Answer 1

local testing of the interface and protocol stack.

Question 2

Will router forward loopback address in the destination or course address field?

Answer 2

no.

Question 3

Are loopback interface’s logical or physical?

Answer 3

logical

Question 4

Will loopback interfaces go down?

Answer 4

never. no physicals attributes.

Question 5

can’t physically be in same subnet mask to avoid waiting IP addresses

Answer 5

because they are logally assigned

Question 6

Best practice with loopback interfaces.

Answer 6

is to assign a loopback interface to all of your routers.

Question 7

commonly used on traffic that terminates on router itself. like:

Answer 7

management traffic. voice over IP, BGP peering and more.

Question 8

Is the loopback addressed used as router ID in OSPF

Answer 8

yes

Question 9

Loopbacks are used by other routers to connect to even if the physical link goes down.

Answer 9

yes

Question 10

loopbacks go up automatically after you create them

Answer 10

yes