Write the subnet ID and broadcast address of each subnet if you divide a class C network (192.168.3.0 – 192.168.3.255) into 4 different subnets. What is the new subnet mask?

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Given class C network = 192.168.3.0

Default subnet mask for class B = 255.255.255.0

We want to make 4 different subnets. So let’s borrow 2 bits from the host id such as 22 = 4

Subnet mask = 11111111.11111111.11111111.11000000

New subnet marks = 255.255.255.192

Now, let’s divide the class B network into a subnet

Subnet ID Usable IP Range Broadcast Address
192.168.3.0 192.168.3.1 – 192.168.3.61 192.168.3.62
192.168.3.63 192.168.3.64 – 192.168.3.126 192.168.3.127
192.168.3.128 192.168.3.129-192.168.3.190 192.168.3.191
192.168.3.192 192.168.3.193 – 192.168.3.254 192.168.3.255

New subnet mask = 255.255.255.192

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