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CCENT/CCNA ICND1 100-101 Official Cert Guide by Wendell Odom

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Deriving the Network ID and Related Numbers

Each classful network has four key numbers that describe the network. You can derive these four numbers if you start with just one IP address in the network. The numbers are as follows:

Image Network number

Image First (numerically lowest) usable address

Image Last (numerically highest) usable address

Image Network broadcast address ...

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