What does subnet mask actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.

A subnet mask simply tells the device how to determine if a given IP is on the same network as it; if it is, it can communicate with that device directly via its MAC address. If the destination IP ...

What subnet mask should you use?<P>2. You are planning to migrate your 100 network computers from IPX/SPX to TCP/IP and establish connectivity to the Internet.