Here's a question,

Say I have a binary number like this

        1101 0100 0110 0110

And I want to pull out of the binary number the third quartet (is that the
right word)

I want to know how to apply the mask

        0000 1111 0000 0000

to the number above so that the result would be

Likewise, given
the number:     1101 0100 0110 0110
and the mask    0000 0000 1111 0000
the result      0110

I suppose this is the same algorithm used to separate the host from the node
address given an IP address and a subnet mask.  I just need to know what the
algorithm is.


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