Discussion
Which of the following is not a network protocol ?
Answer: D
The answer is Z 39.50.
HTTP, SMTP and TCP/IP are the communication protocols on which the Internet runs: TCP/IP carries data between machines, HTTP moves web pages and SMTP moves e-mail. Z39.50 is an ANSI/NISO standard for information retrieval: it lets one library system search another library's catalogue or database and get records back in a common form.
Z39.50 is itself a client-server protocol, but it is an application standard for searching bibliographic databases that runs on top of TCP/IP rather than a networking protocol in its own right, which is the distinction the question draws. The other three are the textbook examples of network protocols.
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