Question

Assuming classful addressing, find the no of subnets and the no of hosts per subnet foe the following blocks: (i) 122.45.77.32/20 (ii) A class B block having mask of 255.255.192.0

Answer 1

Answer:

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Answer 2

Classful Addressing.

• Classful addressing is an IPv4 addressing architecture that divides addresses into five groups.
• The IPv4 address space (0.0.0.0-255.255.255.255) into 5 classes are A, B, C, D, and E.
• The Number of hosts in any network can be calculated with the formula = 2ⁿ– 2. Where n is the number of host ID bits in the IP address.
• Because the first and last addresses are not used for any hosts because the first IP is used to represent the whole network ID while the last IP is used as the broadcast address, we subtract 2 host IDs.
• Therefore, for block 122.45.77.32/20, the number of hosts in each network is 2¹² - 2 = 4094.
• For the Class B block having a mask of 255.255.192.0, we have n=14. Therefore, the number of hosts per subnet is 2¹⁴ - 2 = 16382.

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