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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

BGP (Border Gateway Protocol)
The routing protocol that makes the internet work by exchanging routing information between autonomous systems.
HTTP Keep-Alive
An HTTP mechanism that reuses a single TCP connection for multiple requests, reducing the overhead of establishing new connections.
Multicast
A network communication method that sends data to multiple recipients simultaneously without duplicating packets for each recipient.
WireGuard
A modern, lightweight VPN protocol that uses state-of-the-art cryptography and minimal code for fast, secure tunneling.
Content Delivery Network (CDN)
A geographically distributed network of servers that caches and delivers web content from locations closest to users for faster load times.
MTU (Maximum Transmission Unit)
The maximum size of a data packet that can be transmitted over a network without fragmentation.
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