CREST Practitioner Security Analyst (CPSA) Practice

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Which service typically operates on port 3128?

Web Server
MySQL
Squid Proxy
NFS

The correct answer is: Squid Proxy

Port 3128 is widely recognized as the default port for the Squid Proxy service. Squid is a popular caching and forwarding HTTP web proxy that helps improve web performance by caching static content and managing HTTP traffic. Organizations often use it to optimize internet bandwidth and enhance security by controlling user access to external web resources. The choice of port 3128 for this service is well-documented, making it a standard reference point for configurations and firewall settings related to proxying. In contrast, other services mentioned operate on different standard ports. A web server typically operates on port 80 for HTTP and 443 for HTTPS. MySQL, the open-source relational database management system, uses port 3306. The Network File System (NFS) commonly uses port 2049 for file sharing over a network. Therefore, identifying port 3128 with Squid Proxy aligns with established network service conventions.