IP Addresses:Classful Addressing
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IP Addresses:Classful Addressing
RULE:
If a protocol uses N bits to define an address, the address space is 2N because each bit can have two different values (0 and 1)and N bits can have 2N values
Network Addresses
The network address is the first address
The network address defines the network to the rest of the Internet
Given the network address, we can find the class of the address, the block, and the range of the addresses in the block
In classful addressing, the network address (the first address in the block) is the one that is assigned
to the organization
Mask
A mask is a 32-bit binary number that gives the first address in the block (the network address) when bitwise ANDed with an address in the block.
The network address is the beginning address of each block. It can be found by applying
the default mask toany of the addresses in the block (including itself).
It retains the netid of the block and sets the hostid to zero
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