Question 142 pts

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**.