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doubt:   168.17.07.255  is class B and when we find DBA of class B  it should be 168.17.255.255    how DBA is 168.17.07.255 mentioned here

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168.17.07.255 {Class B}

given that, it is DBA which means all host bits of a subnet should be raised to 1.

last 2 octals  = 0000 0111.11111111

a) 255.255.248.0

last 2 octals = 11111 000. 00000000  {if this is network mask then, its DBA of 0th subnet }

b) 255.255.252.0

last 2 octals = 111111 00.00000000 {if this is network mask then, its DBA of  1st subnet }

c) 255.255.254.0

last 2 octals = 1111111 0. 00000000 {if this is network mask then, its DBA of  3rd subnet }

d) 255.255.255.0

last 2 octals = 11111111.00000000 {if this is network mask then, its DBA of  7th subnet }

Hence , all are correct.

edited by

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