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- 255.255.248.0 in binary: 11111111 11111111 11111000 00000000
- -----------------------------------
- I counted twenty-one 1s -------> /21
- 128.42.5.4 in binary: 10000000 00101010 00000101 00000100
- 255.255.248.0 in binary: 11111111 11111111 11111000 00000000
- ----------------------------------- [Logical AND]
- 10000000 00101010 00000000 00000000 ------> 128.42.0.0
- 128.42.5.4 in binary: 10000000 00101010 00000101 00000100
- 255.255.248.0 in binary: 11111111 11111111 11111000 00000000
- Host bit mask : 00000000 00000000 00000hhh hhhhhhhh
- 128.42.5.4 in binary: 10000000 00101010 00000101 00000100
- Host bit mask : 00000000 00000000 00000hhh hhhhhhhh
- ----------------------------------- [Force host bits]
- 10000000 00101010 00000111 11111111 ----> 128.42.7.255
- 128.42.5.4 in binary: 10000000 00101010 00000101 00000100
- Host bit mask : 00000000 00000000 00000111 11111111
- ----------------------------------- [Logical AND]
- 00000000 00000000 00000101 00000100 -----> 0.0.5.4
- 128.42.5.17 in binary: 10000000 00101010 00000101 00010001
- 128.42.5.67 in binary: 10000000 00101010 00000101 01000011
- ^ ^ ^
- | | |
- +--------- Network ---------+Host-+
- (All bits are the same) Bits
- 128 64 32 16 8 4 2 1
- SN SN SN SN SN SN H H
- 1 0 0 1 1 1 1 1
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