11 Subnetting IPv4 networks
This chapter covers
- What subnetting is and why it’s necessary
- How to borrow bits from the host portion of a network to expand the network portion and create subnets
- How to identify the five attributes of a subnet
- How to divide a network into subnets of equal and variable sizes
In chapter 7, we covered IPv4 address classes, focusing on classes A, B, and C—the three classes of addresses which can be assigned to hosts. Each class is defined by the first bit(s) of the address, and the prefix length of addresses in each range is also defined:
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Class A addresses begin with 0b0 and use a /8 prefix length.
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Class B addresses begin with 0b10 and use a /16 prefix length.
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Class C addresses begin with 0b110 and use a /24 ...
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