Networking 5 things

4 Port Numbers Every Network Student Knows

4 port numbers you must know for your networking exam

Lesson notes

Key points

Port 80: HTTP: Unencrypted web traffic uses TCP port 80 by default.
Port 443: HTTPS: Encrypted web traffic using TLS runs on TCP port 443.
Port 53: DNS: DNS queries use port 53, usually over UDP for speed.
Port 22: SSH: Secure remote login to servers uses SSH on TCP port 22.

Takeaway: Ports tell the receiving host which application gets the data.

Quick check: Which port number does SSH use by default for secure remote login?

Port 80
Port 53
Port 22

SSH listens on TCP port 22 by default.

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