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How TCP Handles Errors

Last Updated: 7th September, 2026

In real networks, problems are normal:

  • Packets get lost
  • Packets arrive late
  • Packets get duplicated

TCP is designed to detect and fix these issues automatically.

How TCP Detects Errors

TCP uses a few smart techniques:

  • Sequence Numbers → Detect missing packets
  • Checksums → Detect corrupted data
  • Acknowledgements (ACK) → Confirm received packets

If something goes wrong:

TCP immediately knows.

How TCP Fixes Errors

Once an issue is detected, TCP:

  1. Identifies missing packet
  2. Requests retransmission
  3. Replaces incorrect data
  4. Maintains correct order

All of this happens in milliseconds

Code-Level Handling in Node.js

Even though TCP handles most errors internally, you still need to handle runtime issues in your app:

socket.on('error', (err) => {
  console.error('Error occurred:', err.message);
});

Errors are unavoidable in networks.

But TCP makes sure they are:
Detected
Fixed
Invisible to the user

That’s why your apps feel smooth and dependable, even when the network isn’t.

Module 6: Error Handling in TCPHow TCP Handles Errors

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