A server process in Host B has a welcoming socket at port 977. What will trigger the server process to create a connection socket?

Explanation:

This connection socket will be created when Host B receives a TCP SYN segment that contains the destination port number 977. This means that there is data that is trying to enter through that port number, as a welcoming socket this destination is available and when data requests access through it the OS creates a connection socket using Host B in order to allow access to the TCP SYN segment.

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