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Which of the following options is/are false?
  1. If the maximum value sequence number in the GBN is n, then the maximum sender window is n-1.
  1. The size of fragments in IPv4 packet fragmentation payload is always divisible by 8 except the last fragment.
  1. DF bit is called do not fragment bit and its value is 1 when there is no    fragmentation.
  1. Identification number for every fragment of the IPV4 packet is different.

They have provided the ans as 1, 3 and 4. Can someone explain me how option 3 is false?

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