Port Management & Security
Open and close specific ports for services, implement port forwarding, and understand common attack vectors related to open ports.
What Are Network Ports?
Imagine a server as an apartment building. Each apartment has a number, and visitors need to know which apartment number to go to. In networking, these 'apartment numbers' are called ports.
Network ports are communication endpoints. They help your server direct incoming network traffic to the correct service or application. Each port is assigned a unique number, ranging from 0 to 65535.
Common Port Numbers
Many services use standard, well-known port numbers. Knowing these helps you identify services and configure firewalls.
- Port 22: Used for SSH (Secure Shell) for remote access.
- Port 80: Used for HTTP (Hypertext Transfer Protocol) for standard web traffic.
- Port 443: Used for HTTPS (HTTP Secure) for encrypted web traffic.
- Port 53: Used for DNS (Domain Name System) name resolution.
These are just a few examples; thousands of ports exist for various applications.
All lessons in this course
- Basic Network Configuration
- Understanding Firewalls (UFW/firewalld)
- Port Management & Security
- DNS Configuration and Troubleshooting