Module 4~8 min
Understanding Ports
A single device can run many network services at once. Ports are how the device keeps that traffic organized.
What You'll Learn
- What a port is
- Why devices use multiple ports
- Examples of well-known ports
What a Port Does
A port is a numbered channel on a device used for a specific kind of network traffic. Combined with an IP address, a port tells data exactly which service on that device it should go to.
Well-Known Ports
Certain ports are conventionally reserved for specific services. For example, web traffic commonly uses port 80 for HTTP and port 443 for HTTPS.
Example
A single web server might use port 80 for regular web traffic and port 443 for secure traffic, keeping the two clearly separated even though they arrive at the same IP address.
Key Concepts
PortWell-Known PortsService
Key Takeaways
- A port identifies a specific service on a device
- Ports let a single device run multiple network services at once
- Certain port numbers are conventionally reserved for specific services
Knowledge Check
What is the role of a port number in networking?