Glossary: Security+ Exam Prep 2: Performance-Based Questions

/24 (address range)

Also written: 203.0.113.0/24, 192.0.2.0/24

A way of writing a whole block of IP addresses: /24 means every address that shares the first three numbers, such as 203.0.113.0 to 203.0.113.255. Firewall rules use it to match a whole network, such as the attack network or the cafés' range.