In IPv4 subnetting, a prefix length of /28 corresponds to a block size of ____ total IP addresses.
Answer
16
Explanation
### Why this is right
The block-size table states that `/28` has a block size of 16. The neighboring entries are `/27` with 32 and `/29` with 8, so the value also fits the pattern of halving the block size as the prefix grows by one bit.
### The concept
The block size tells you how far apart subnet boundaries occur at the relevant octet. It helps a designer divide an address range into valid subnet blocks. In the supplied table, the sequence is `/25` equals 128, `/26` equals 64, `/27` equals 32, `/28` equals 16, `/29` equals 8, and `/30` equals 4.
### Terms
- **IP**: Internet Protocol. The addressing system used for network packets.
### Remember
Each one-bit increase in the listed prefix halves the block size.
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