CREST Practitioner Security Analyst (CPSA) 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 485

Port 42 is primarily used for which service?

Host Name Server (Nameserv)

Port 42 is primarily known for being used by the Host Name Server service, also referred to as the Nameserv service. This port is significant in the Domain Name System (DNS) context, where it facilitates the mapping of hostnames to IP addresses, allowing for the resolution of names to their respective network locations. This functionality is critical for network communication, as it enables users and applications to refer to services by human-readable names instead of numeric IP addresses.

Other services associated with ports mentioned in the options have their own dedicated ports. Telnet typically uses port 23, secured file transfer generally occurs over ports like 22 (for SFTP) or 989/990 (for FTPS), and remote login protocols often utilize port 22 as well for SSH. Hence, option A accurately represents the service linked to port 42, distinguishing it from the other options listed.

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Telnet

Secured File Transfer

Remote Login

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