GATE | GATE IT 2006 | Question 69

A program on machine X attempts to open a UDP connection to port 5376 on a machine Y, and a TCP connection to port 8632 on machine Z. However, there are no applications listening at the corresponding ports on Y and Z. An ICMP Port Unreachable error will be generated by
(A) Y but not Z
(B) Z but not Y
(C) Neither Y nor Z
(D) Both Y and Z


Answer: (D)

Explanation: A Destination Unreachable message may be generated as a result of a TCP, UDP or another ICMP transmission.
Reference: https://en.wikipedia.org/wiki/Internet_Control_Message_Protocol


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