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Beginner Topic 16 of 50 Computer Networks

Ports and Sockets

Endpoints identifying services and connections on hosts.

How it works

A port number (0–65535) identifies a service on a host; a socket is the endpoint (IP, port, protocol). A connection is identified by the 4-tuple of source and destination addresses and ports.

Where it is used

HTTP 80, HTTPS 443, SSH 22.

Common pitfall

Only one process may bind a port at a time unless options like SO_REUSEPORT are used.

Where it fits in the course

Ports and Sockets is topic 16 of 50 in Computer Networks, rated Beginner. It follows HTTP. The next topic is Packet Switching.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the Computer Networks quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is Ports and Sockets?
Endpoints identifying services and connections on hosts. It belongs to Computer Networks and is a beginner-level topic.
Where do people use Ports and Sockets?
HTTP 80, HTTPS 443, SSH 22.
What is the most common mistake with Ports and Sockets?
Only one process may bind a port at a time unless options like SO_REUSEPORT are used.
What should I learn before this topic?
Start with HTTP, the topic just before it in Computer Networks.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Computer Networks quiz.
Is Ports and Sockets hard to learn?
It is a Beginner topic, so it works as an entry point. If the terms are new, read the explanation twice and try the visualizer before the quiz.
How long does it take to learn Ports and Sockets?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Ports and Sockets?
HTTP, Packet Switching, DHCP are closely connected. The full list is in the related topics section of this page.
What should I study after Ports and Sockets?
Continue with Packet Switching, the next topic in Computer Networks.

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