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Networking Beginner

What is Port?

A numbered endpoint (0-65535) that identifies specific processes or services on a networked computer for communication.

Ports allow multiple network services to run on a single IP address. Well-known ports (0-1023) include HTTP (80), HTTPS (443), SSH (22), FTP (21), SMTP (25), and DNS (53). Registered ports (1024-49151) are used by applications.

Firewalls control access by allowing or blocking specific ports. Port scanning (nmap) discovers open ports on a system. Running services on non-standard ports provides slight security through obscurity but is not a real security measure.

Related Terms

Anycast
A network routing technique where the same IP address is announced from multiple locations, directing users to the nearest server.
Token Bucket Algorithm
A rate limiting algorithm that allows burst traffic by accumulating tokens at a fixed rate and consuming them per request.
WireGuard
A modern, lightweight VPN protocol that uses state-of-the-art cryptography and minimal code for fast, secure tunneling.
HTTPS Everywhere
The practice of securing all web traffic with TLS encryption, ensuring data integrity and privacy between browsers and servers.
Proxy Server
An intermediary server that forwards requests between clients and destination servers, providing caching, filtering, or anonymity.
HTTP/HTTPS
The protocol used for transferring web pages and data between browsers and servers, with HTTPS adding encryption.
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