1 answer
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The subnet mask for a /22 prefix is 255.255.252.0.
In binary, a /22 subnet mask looks like this:
```
11111111.11111111.11111100.00000000
```
This translates to:
- 255 for the first octet (8 bits set)
- 255 for the second octet (8 bits set)
- 252 for the third octet (6 bits set, 2 bits unset)
- 0 for the fourth octet (8 bits unset)
Thus, the correct answer is **255.255.252.0**.