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Functions of OSI and TCP/IP Layers Q.26

26An Internet Service Provider (I SP) has the following chunk of CI DR-based I P addresses available with it: 245.248.128.0/20. The ISP wants to give half of this chunk of addresses to Organization A, and a quarter of Organization B, while retaining the remaining with itself. Which of the following is a valid allocation of addresses to A and B?
  • Option : A
  • Explanation :
    functions of osi

    Since half of 4096 host addresses must be given to organization A, we can set 12th bit to 1 and include that bit into network part of organization A, so the valid allocation of addresses to A is 245.248.136.0/21
    Now for organization B, 12th bit is set to ‘0' but since we need only half of 2048 addresses, 13th bit can be set t o ‘0' and include that bit into network part of organization B so the valid allocation of addresses to B is 245.248.128.0/2.
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