Question

for this part of your assignment, you will be answering questions about subnets. i would suggest you use the 3 subnet worksheets i provided on blackboard as part of the lesson 4 lecture files to answer the following questions. i will be providing an answer sheet for this assignment after the deadline has passed. part 1 - given a subnet mask of 255.255.255.248: how many subnets/networks could i have? how many usable ip addresses or hosts are possible? what would the cidr block be?

Answer 1

With a subnet mask of 255.255.255.248, you can have 32 subnets, each supporting 6 usable IP addresses. The CIDR block for this subnet is /29.

1. Number of Subnets/Networks:

To determine the number of subnets, count the bits used for the subnet portion. In a subnet mask of 255.255.255.248, the subnet portion consists of the last 5 bits (248 in binary is 11111000). Therefore, there are
`\(2^5 = 32\)` possible subnets.

2. Number of Usable IP Addresses/Hosts:

The number of usable IP addresses in each subnet can be calculated using
`\(2^{(32 - \text{subnet bits})} - 2\)`. In this case, there are 3 host bits
`(\(32 - 5\))`, so each subnet has
`\(2^3 - 2 = 6\)` usable IP addresses.

3. CIDR Block:

The CIDR block notation is represented by the subnet mask converted to CIDR format. In this case, the subnet mask 255.255.255.248 is equivalent to /29 in CIDR notation because there are 29 bits dedicated to the network part.

In summary:

- Number of Subnets: 32

- Usable IP Addresses per Subnet: 6

- CIDR Block: /29