take 255.255.255.255 and subtract your reverse mask to get actual mask

EX
        255.255.255.255
     -  0.  7.255.255

        255.248.  0.  0

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Keith Townsend
Sent: Tuesday, October 24, 2000 12:15 PM
To: [EMAIL PROTECTED]
Subject: Inverse Mask


I need help in understanding inverse masks that are used in network & access
list commands.  I understabd what 0 and 255 do but I get confused when there
is any number other than these two.  For example...

network 10.0.0.0 0.7.255.255 area 0

what does the 7 represent or specifiy for the mask.

Thanks

Keith


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