CREST Practitioner Security Analyst (CPSA) Practice

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Which protocol operates on port 119?

NNTP (Network News Transfer Protocol)
SMTP
POP3
DNS

The correct answer is: NNTP (Network News Transfer Protocol)

NNTP, or Network News Transfer Protocol, is the correct choice for the protocol that operates on port 119. This protocol is primarily used for the distribution, retrieval, and posting of Usenet articles and is essential in managing networked news groups. By using port 119, NNTP facilitates the transport of news messages and allows users to access and interact with news articles seamlessly. Understanding the context of other protocols can help clarify this point. SMTP, or Simple Mail Transfer Protocol, operates on port 25 and is used for sending emails. POP3, or Post Office Protocol version 3, operates on port 110 and is primarily used for retrieving emails from a server. DNS, or Domain Name System, typically operates on port 53 and is used for resolving domain names into IP addresses. Each of these protocols serves distinct purposes in the realm of network communications, whereas NNTP specifically handles the transmission of Usenet content over the internet.