Chapter 3 - Subnetting and Class C Addresses
Cisco & IP Addressing
Louis D. Rossi, Louis R. Rossi and Thomas Rossi
Copyright © 1999 The McGraw-Hill Companies, Inc.
Summary
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With a Class C address there are only 8 bits (4th octet) that can be manipulated or changed.
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2
N
–2 is the formula to use to calculate the available number of hosts and networks.
•
A broadcast address for a network is when all host bits have a value of 1.
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A broadcast address is always the last address on a wire.
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A broadcast address identifies all hosts on a network.
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Wire addresses are always multiples of the least significant subnet bit.
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To calculate a wire address you must have an IP address and a mask.
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The multiple process is a quick and easy way to determine wire and broadcast addresses.
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