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

The association of port 546 is specifically tied to DHCPv6, which stands for Dynamic Host Configuration Protocol for IPv6. This port is used by DHCPv6 clients to send solicitations to the DHCPv6 server on port 547. In a network utilizing IPv6, the DHCPv6 client communicates with the server to configure IP addresses and other related network settings.

Understanding the purpose of this protocol is crucial for network configuration and management, especially as organizations transition from IPv4 to IPv6. DHCPv6 helps allocate IP addresses dynamically, simplifying the management of network resources in environments where manual configuration would be impractical.

In contrast, DHCPv4 is related to port 67, while DNS typically operates on ports 53, and SMTP uses port 25. The specifics of DHCPv6 and its port assignments are what make the correct answer valid.