Question

To help develop your subnet-calculation skills, you are now challenged with a practice subnetting exercise.

Using a separate sheet of paper, solve the following scenario:

Based on your network design requirements, you determine that you should use a 26-bit subnet mask applied to your 192.168.0.0/24 network. You now need to calculate each of the created subnets. Additionally, you want to know the broadcast address and the range of usable addresses for each of the created subnets.

Advanced Subnetting Practice: Exercise 1 Solution

As described earlier, you can go through the following four-step process to determine the subnet address:

Step 1.​The subnet mask (in binary) is 11111111.11111111.11111111.11000000.

The interesting octet is the fourth octet because the fourth octet contains the last 1 in the subnet mask.

Step 2. The decimal value of the fourth octet in the subnet mask is 192 (11000000 in decimal). Therefore, the block size is 64 (256 – 192 = 64).

Step 3. The first subnet is 192.168.0.0/26 (the value of the original 192.168.0.0 network with the borrowed bits [the first 2 bits in the last octet] set to 0).

Step 4. Counting by 64 (the block size) in the interesting octet (the fourth octet) allows you to calculate the remaining subnets, resulting in the following subnets:

192.168.0.0

192.168.0.64

192.168.0.128

192.168.0.192

The directed broadcast addresses for each of the preceding subnets can be calculated by adding 63 (that is, one less than the block size) to the interesting octet for each subnet address. Excluding the subnet addresses and directed broadcast addresses, a range of usable addresses can be calculated, the results of which are seen in Table 1 .

Complete the table by replaing the X with a decimal value

Table 1​Usable IP Address Ranges for the 192.168.0.0/26 Subnets

Subnet Address	Directed Broadcast Address	Usable IP Addresses
192.168.0.X	192.168.0.XX	192.168.0.X–192.168.0.XX
192.168.0.XX	192.168.0.XXX	192.168.0.XX–192.168.0.XX
192.168.0.XXX	192.168.0.XXX	192.168.0.XXX–192.168.0.XXX
192.168.0.XXX	192.168.0.XXX	192.168.0.XXX–192.168.0.XXX

Answer 1

Solution:

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