Question

A program on machine X attempts to open a UDP connection to prot 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. Neither Y nor Z
• B. Y but not Z
• C. Z but not Y
• D. Both Y and Z

Answer 1

The correct option is A Neither Y nor Z

An ICMP port unreachable error will be generated for both UDP as well as TCP. It is independent on the transport layer protocol.