Question

ISPs block 200.23.16.0/20, supports 3 organizations, as follows: Organization 0 200.23.32.0/23 Organization 1 200.23.34.0/23
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Answer #1

ISP block 200.23.16.0/20

Organization 0 : 200.23.32.0/23


11001000. 00010111.00100000.00000000 // 9 bits for Host ID
11111111. 11111111. 11111110.00000000 // subnet mask // 255.255.254.0
-------------------------------------------------------
11001000. 00010111.00100000.00000000 // subnet id:

Organization 1 : 200.23.34.0/23


11001000. 00010111.00100010.00000000   // 9 bits for Host ID
11111111. 11111111.11111110.00000000 // subnet mask // 255.255.254.0
-------------------------------------------------------
11001000. 00010111.00100010.00000000 // subnet id:


Organization 2 : 200.23.36.0/23

11001000. 00010111.00100100.00000000 // 9 bits for Host ID
11111111. 11111111. 11111110.00000000 // subnet mask // 255.255.254.0
-------------------------------------------------------
11001000. 00010111.00100100.00000000 // subnet id:

Answer(a) No of host in Each organization are 29   = 512 host total

  • Organization 0 : 200.23.32.0/23 numbers of host will be 512
  • Organization 1 : 200.23.34.0/23 numbers of host will be 512
  • Organization 2 : 200.23.36.0/23 numbers of host will be 512

Note: (Out of 512 total host, 2 host ip are reserved for special purpose like network address and broadcast address)

Answer(b) Subnet Mask of Each organization is 255.255.254.0

  • Organization 0 : 200.23.32.0/23 Subnet Mask is 255.255.254.0
  • Organization 1 : 200.23.34.0/23 Subnet Mask is 255.255.254.0
  • Organization 2 : 200.23.36.0/23 Subnet Mask is  255.255.254.0
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