Well-Known Ports — Cisco CCNA (200-301) Practice Questions

Well-known ports are standardized TCP and UDP port numbers in the range 0 to 1023, assigned by IANA to identify specific application-layer protocols. The CCNA 200-301 exam tests your ability to recognize ports such as 80 for HTTP, 443 for HTTPS, 22 for SSH, 25 for SMTP, and 53 for DNS, among others. Understanding these assignments is essential for configuring access control lists, firewall rules, and network address translation. Questions frequently ask you to match a protocol to its port number or identify traffic based on port values in a scenario.

Free questions on well-known ports