Determine the number of bits that need to be borrowed from the host portion of the network address and the number of bits that will be left for host addresses.

Fill in the following table for all the subnets that your subnetting of the network creates. This may be more than actually needed to satisfy the above requirement.

Subnet number	Subnet ID binary value	Host bits binary range	Last octet binary range	Last octet decimal range	IP range 197.15.22.0	Usable
0	00	0000-1111	00000000- 00..1111	0-2n-1	197.15.22.0- 197.15.22.2n-1	No
1	001	0000-1111	00000000- 00..1111	32	197.15.22.32	Yes
2	010	0000-1111	00000000- 00..1111	64	197.15.22.64	Yes
3	011	0000-1111	00000000- 00..1111	96	197.15.22.96	Yes
4	100	0000-1111	00000000- 00..1111	128	197.15.22.128	Yes
5	101	0000-1111	00000000- 00..1111	160	197.15.22.160	Yes
6	110	0000-1111	00000000- 00..1111	192	197.15.22.192	Yes
7	111	0000-1111	00000000- 00..1111	224	197.15.22.224	No

Use the table just developed to help answer the following questions:

Which octet(s) represent the network portion of a Class C IP address?

The first three octets by default

Which octet(s) represent the host portion of a Class C IP address?

The last three octets represent the host portion.

For the subnets you defined how many bits in total represent the network portion of the IP address?

For the subnets you defined how many bits are left in the fourth octet for host IDs?

What subnet mask must be used for the subnets you defined? Give the subnet mask in both decimal and binary.

What is the maximum number of subnets that can be created with this subnet mask (in answering this question ignore the consideration of whether a particular subnet is usable or not)

What is the maximum number of useable subnets that can be created with this mask?

How many hosts per subnet can be in the subnets you have created? Assume the lowest and highest host ID in each subnet cannot be used.

Why cant the lowest and highest address in each subnet be used?

What is the maximum number of hosts that can be defined for all subnets with this scenario if the all 0s and all 1s subnets cannot be used but all others can be? Assume the lowest and highest host ID in each subnet cannot be used.

Answer the previous question again, but now assume the all 0s and all 1s subnets can be used

Is 197.15.22.63 a valid host IP address with this scenario? Why or why not?

Is 197.15.22.160 a valid host IP address with this scenario? Why or why not?

Host A has an IP address of 197.15.22.126. Host B has an IP address of 197.15.22.129. Are these hosts on the same subnet? Why?