Did you know Cybrary has FREE video training? Join more than 2,500,000 IT and cyber security professionals, students, career changers, and more, growing their careers on Cybrary.
Classful IP Addressing (part 1) In this lesson, we'll discuss what the subnet mask does. We correlate IP addressing to your home address and the postal system infrastructure to explain the concept of how a subnet mask works and what it does. We diagram and explain using binary code both subnet mask and IP address numbering convention and explains the class system infrastructure for determining for example a class A from a Class B address.