► Get the COMPUTER NETWORKING audio book here ► (Amazon affiliate). Just get the book by signing up for a free 30-day trial of Amazon Audible Premium Plus. A subnet mask is a number that resembles an IP address. It reveals how many bits in the IP address are used for the network by masking the network portion of the IP address. This video also does a short lesson on subnetting. Subnetting is breaking down a large network into smaller networks or subnets. Chapters: 0:00 Intro What is an IP address?: 00:10 Subnet Mask: 01:11 Binary Lesson: 01:31 Network and Host parts of an IP address: 07:26 Purpose of Subnetting: 07:50 Subnetting example: 11:01 Subnet Mask classes: 15:03 CIDR: 16:37 If you appreciate this video and want to help support my channel, please use my Amazon affiliate link * every time you make a purchase on Amazon. Save my link as a bookmark or favorite in your web browser. I get a small percentage of every sale. It costs you nothing. It’s completely free. Thank you!