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TCP/IP Configuration (part 3) Now that we've defined and composed IP address, we examine how to identify what the host address is vs. the network ID, and introduce you to the concept of subnets and subnet masking. Subnet mask address a very basic question, you'll learn what that focus is and how to identify its segment within a given IP address. You'll be able to diagram an IP address, determine which addresses are on the same network and which address must use a router to communicate with IPs on a different network, and articulate why the number 255 is used in subnet masking.