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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

NAT (Network Address Translation)
A method of mapping private IP addresses to public IP addresses, allowing multiple devices to share a single public IP.
Multicast
A network communication method that sends data to multiple recipients simultaneously without duplicating packets for each recipient.
SNMP (Simple Network Management Protocol)
A protocol for monitoring and managing network devices like routers, switches, servers, and printers remotely.
Network Topology
The physical or logical arrangement of nodes and connections in a computer network, such as star, mesh, ring, or bus configurations.
DNS over HTTPS (DoH)
A protocol that encrypts DNS queries by sending them over HTTPS, preventing eavesdropping and manipulation of DNS traffic.
Proxy Server
An intermediary server that forwards requests between clients and destination servers, providing caching, filtering, or anonymity.
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