Explain subnet masks simply.

A subnet mask is a number that helps define the size of a network and determines which part of an IP address identifies the network and which part identifies the host (the individual device).

Key Points:

• Format: Typically written in the same format as an IP address (e.g., 255.255.255.0).
• Function: It "masks" the IP address to show which bits are used for the network and which are used for hosts.
• Binary Representation: In binary, a subnet mask consists of a series of 1s followed by 0s. For example, 255.255.255.0 in binary is 11111111.11111111.11111111.00000000. The 1s represent the network part, and the 0s represent the host part.

Example:

• For the IP address 192.168.1.10 with a subnet mask of 255.255.255.0:
  • Network part: 192.168.1
  • Host part: 10

This means all devices with IPs starting with 192.168.1 are in the same network.

If you have more questions or need further clarification, let me know!