You need to know this and you don’t! I know, I’m not helping much, but address classes are actually only significant historically, so as a new Cisco engineer, you might become confused when you look at the old rules and try to apply them to new methods of network design.
We still refer to groups of IP addresses as classes, but with the introduction of subnet masking and VLSM, they are actually no longer applicable to network design. Address classes are useful to know, though, because they show us which parts of the IP address we can and . . .
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