CREST Practitioner Security Analyst (CPSA) Practice 2026 - Free CPSA Practice Questions and Study Guide

The protocol that utilizes Port 69 (UDP) is Trivial File Transfer Protocol (TFTP). TFTP is a simplified version of FTP designed for transferring files without the need for complex commands or authentication. It operates over UDP, which is a connectionless protocol, making it lightweight and faster for applications that do not require the overhead of establishing a connection.

Since TFTP does not incorporate any form of authentication or directory listings, it is generally used in scenarios where basic file transfer functionality is sufficient, such as transferring configuration files to network devices or booting diskless workstations.

The other protocols listed employ different ports and may use either TCP or UDP based on their specific requirements. For instance, FTP uses Ports 20 and 21 typically over TCP for reliable transmission; HTTP operates over Port 80 using TCP to ensure the integrity of web communications; and DHCP usually functions over Ports 67 and 68 using UDP for dynamic IP address assignment in networks. Each protocol is tailored to meet certain operational needs and network architectures. This distinction in port usage is pivotal for understanding networking concepts and capacity in security analysis.