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Which of the following will definitely result in datagram fragmentation ?
 

  1.    Transmitting over a circuit-switched network
  2.    Transmitting datagrams with more than $4$ $bytes$ in the $IP$ header
  3.    Transmitting over a packet-switched network
  4.    Transmitting datagrams longer than the physical layer’s maximum transmission unit
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Each network can have a different maximum transmission unit  or MTU .

If a datagram is found to be larger than the allowable byte size for network packets, the IP breaks up the datagram into fragments and sends each fragment as an IP packet.

When fragmentation does occur, the IP duplicates the source address and destination address into each IP packet, so that the resulting IP packets can be delivered independently of each other.
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