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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

HTTP/HTTPS
The protocol used for transferring web pages and data between browsers and servers, with HTTPS adding encryption.
CIDR Notation
A compact method for specifying IP addresses and their associated routing prefix using a slash followed by the prefix length.
SSL/TLS Certificate
A digital certificate that authenticates a website identity and enables encrypted HTTPS connections.
Network Segmentation
The practice of dividing a network into isolated segments to improve security, performance, and management.
DHCP
A protocol that automatically assigns IP addresses and network configuration to devices on a network.
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.
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