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• IP header consists of a field called as Time to live field. This value indicates how long a packet can survive.

• The value in the Time to live field is decremented every time the datagram is forwarded through a router, therefore once the field value becomes zero the datagram is not forwarded further and the datagram is discarded.

• This field ensures that a datagram is not forwarded through more than N routers considering N is the value of time to live field

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