What is a protocol you would use to send data from one network to another one?

This is a different format of a technical question. Rather than provide you with a term and ask you to define it and describe its use, the interviewer asks you about the protocol you would use to perform a specific function on the network. There is no standard format for technical questions the interviewer will ask you. By asking you how you would perform a specific function, they are confirming that you have experience in this area and have done this in one of your past positions.