Glossary: Security+ Exam Prep 2: Performance-Based Questions

port

Also written: port number, TCP port, UDP port

A number that identifies which service on a computer traffic is for, such as 443 for HTTPS or 22 for SSH. Firewall rules and secure-protocol choices often turn on the port.

Where the book teaches it

Chapter 1: How Performance-Based Questions Work
Chapter 4: Domain 3 Tasks: Architecture and Data
Chapter 5: Domain 4 Tasks: Firewalls, Scans and Automation
Chapter 8: Practice Tasks

Related terms

TCP (Transmission Control Protocol)UDP (User Datagram Protocol)firewall attack surface