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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

VLAN (Virtual LAN)
A logical grouping of network devices that creates separate broadcast domains on the same physical network infrastructure.
IP Address
A unique numerical label assigned to each device on a computer network for identification and communication.
Latency
The time delay between sending a request and receiving a response, measured in milliseconds.
Network Bridge
A device or software that connects two or more network segments at the data link layer, forwarding traffic based on MAC addresses.
Network Monitoring
The practice of continuously observing network infrastructure to detect failures, performance degradation, and security threats.
DNS Propagation
The time it takes for DNS record changes to spread across all DNS servers worldwide, typically taking up to 48 hours.
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