A.1.1. Subnetting Practice Examples: Class A Addresses
When you look at an IP address and a subnet mask, you must be able to distinguish the bits used for subnets from the bits used for determining hosts. This is imperative. If you're still struggling with this concept, please reread the section, "IP Addressing," in Chapter 2. It shows you how to determine the difference between the subnet and host bits and should help clear things up.
A.1.1.1. Practice Example #1A: 255.255.0.0 (/16)
Class A addresses use a default mask of 255.0.0.0, which leaves 22 bits for subnetting since you must leave 2 bits for host addressing. The 255.255.0.0 mask with a Class A address is using 8 subnet bits.
Subnets? 28 = 256.
Hosts? 216 – 2 = 65,534.
Valid subnets? ...
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