Question

Classful Subnetting

1. Given the following IP address of 212.134.99.112 with a subnet mask of 255.255.255.224
2. 1. Class of the IP address:
   2. Net ID for this IP address:
   3. Total number of subnets:
   4. First address (subnet ID) and the Last address (broadcast address) that 21.134.99.112 belongs to:

2. Find the subnet masks that create the following number of valid subnets in a Class B address.     

# Valid Subnets Needed	Subnet Mask
2
250
30
510
5
120

3. Give the maximum number of total subnets in Class C using the following masks.

Subnet Mask	# Total Subnets Created
255.255.255.192
255.255.255.248
255.255.255.224

4. For the following subnet masks used in Class B, find the number of bits reserved for defining the subnet:

Subnet Mask	# Subnet Bits
255.255.192.0
255.255.255.192
255.255.240.0
255.255.255.252

5. An organization is granted the block 135.0.0.0. The administrator wants to create 1024 total subnets. Find the following:
   1. Subnet mask:
   2. Number of host bits:
   3. First and last address (subnet ID & broadcast) in the first valid subnet.
6. 4. Find the first and last valid host addresses in the last valid subnet.

6. Write the following masks in the CIDR notation (/n format).

Subnet Mask	/n format
255.255.0.0
255.224.0.0
255.255.255.128
255.255.248.0

7. An organization was assigned 116.0.0.0. They created a subnet mask of 255.255.255.128. Are the following addresses valid (can be assigned to hosts)? If not, explain why.

IP Address	Valid? (Y/N)
116.0.0.50
116.0.0.167
116.1.45.232
116.255.254.128
116.128.128.254
116.13.0.255

Answer 1