How to Create Subnets

Question 1

How are sub-networks created?

Answer 1

Bits from the host portion of the IP address are used to define the subnet address.

Question 2

2^4

Answer 2

16

Question 3

2^5

Answer 3

32

Question 4

2^6

Answer 4

64

Question 5

2^7

Answer 5

128

Question 6

2^8

Answer 6

256

Question 7

What does a subnet mask accomplish?

Answer 7

A subnet mask is a 32-bit value that allows the recipient of IP packets to distinguish the network ID portion of the IP address from the host ID portion of the IP address. Every machine on the network must know which part of the host address will be used as the subnet address.

Question 8

What are the 3 ways that a subnet mask is represented?

Answer 8

Binary, decimal and CIDR (Classless Inter-Domain Routing)

Question 9

What do the 1s in the binary representation of the subnet mask mean?

Answer 9

The 1s in the subnet mask represent the positions that refer to the network or subnet addresses.

Question 10

What does a default subnet mask mean?

Answer 10

That the network has no subnets.

Question 11

List the default subnet masks for classes A, B, and C

Answer 11

A network.host.host.host 255.0.0.0
B network.network.host.host 255.255.0.0
C network.network.network.host 255.255.255.0

Question 12

Do default subnet masks change?

Answer 12

No