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In case of time exceeded error, when the datagram visits a router, the value of time to live field is _________

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In case of time exceeded error, when the datagram visits a router, the value of time to live field is _________

(a) Remains constant

(b) Decremented by 2

(c) Incremented by 1

(d) Decremented by 1

I had been asked this question by my school principal while I was bunking the class.

The query is from ICMP in division TCP/IP Protocol Suite of Computer Network

1 Answer

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Right answer is (d) Decremented by 1

To elaborate: This field will be decremented by 1 at every router, and will be zero by the time it reaches source. This error reporting message is type 11 and is used to prevent the router from travelling forever in case some unknown path anomaly occurs.

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