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Module 3: Network Layer & Routing

20232m

How many bits are required to represent IPv4 address in any IPv4 header?
(i) 64 bits
(ii) 32 bits
(iii) 16 bits
(iv) 8 bits

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Answer

(ii) 32 bits

Explanation

An IPv4 address is 32 bits long, normally written as four 8-bit octets in dotted-decimal notation, for example 192.168.1.10.

The IPv4 header contains two 32-bit address fields:

  • Source address: 32 bits
  • Destination address: 32 bits

Thus, each individual IPv4 address requires 32 bits.

Final answer: (ii) 32 bits.

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