What is the total number of IP addresses (block size) in an IPv4 subnet that uses a /30 CIDR prefix?
Answer
4 addresses
Explanation
### Why this is right
The supplied table lists `/30` with a block size of 4. This is the smallest block in the listed sequence.
### The concept
A prefix length describes how many bits identify the network portion of an address. In the table's fourth-octet examples, a longer prefix leaves a smaller block. The sequence makes this visible: `/27` has 32 addresses, `/28` has 16, `/29` has 8, and `/30` has 4. Block size helps with subnet boundary calculations, but it should not be mistaken for a number of usable host addresses.
### The other options
- **B. 8 addresses**: this is the block size for `/29`.
- **C. 16 addresses**: this is the block size for `/28`.
- **D. 32 addresses**: this is the block size for `/27`.
### Terms
- **IP**: Internet Protocol. The network addressing system used by routers.
### Remember
In the supplied table, `/30` corresponds to four addresses.
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