Chapter 26

Question 1

What is classless addressing

Answer 1

Instead of using prefix and suffix, we can put this boundary at any arbitrary place. In this way, we can save a lot of IP addresses in pool and allocate them to other customers.

Question 2

What is subnet mask or address mask

Answer 2

It tells the division between prefix and suffix in classless addressing

Question 3

Does subnet mask also 32-bit number

Answer 3

Yes

Question 4

1’s represent what in subnet mask

Answer 4

Prefix/physical network

Question 5

0’s represent what in subnet mask

Answer 5

Suffix/host

Question 6

What is classless inter domain routing (CIDR)

Answer 6

It is also an extension of decimal notation. But in this case, instead of long 32 bit, we convert it into decimal notation, that have a small address. That small address represent the subnet mask that is associated with this IP address. It is known as CIDR notation. (e.g. 128.10.0.0/16)

Question 7

What are special IP addresses

Answer 7

There are some IP addresses that are reserved for special purposes. And we can not use them to attach host to network. If we do so, they will malfunction.

Question 8

Where 127.0.0.1 used

Answer 8

Its a special IP addresses for testing purpose. It loopback