Multiple choice

What value would typically be in the first byte of the IPv4 header?

  1. 0x0800

  2. 0x45

  3. 0x54

  4. 0x0806
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B Correct answer
Explanation

The first byte of an IPv4 header contains the Version (4 bits) and the IHL (Internet Header Length, 4 bits). A standard header with no options has an IHL of 5 (5 * 4 bytes = 20 bytes). Thus, the byte is 0x45.

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