# What subnet mask is represented by the slash notation /20?

- 255.255.255.248
- 255.255.224.0
- 255.255.240.0
- 255.255.255.0
- 255.255.255.192

**Explanation:**The slash notation /20 represents a subnet mask with 20 1s. This would translate to: 11111111.11111111.11110000.0000, which in turn would convert into 255.255.240.0.