WFA Lesson 2 – Networking Practice Test

CIDR notation communicates the network portion of an IP address by putting a slash and a number after the address. That number is the mask length, telling you how many leading bits are used to identify the network. For example, 192.0.2.0/24 means the first 24 bits define the network, leaving the remaining bits for hosts within that network. The /24 length corresponds to a subnet mask of 255.255.255.0 in IPv4, and similar logic applies in IPv6 (such as a /64). CIDR is about how networks are defined and subdivided, not about ports—so it doesn’t specify port ranges. And while many IPv4 examples use dotted-decimal addresses, IPv6 uses its own notation, so CIDR isn’t limited to decimal dotted addresses.