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Networking Intermediate

What is QoS (Quality of Service)?

A set of techniques for managing network traffic to prioritize certain types of data and ensure performance for critical applications.

QoS manages bandwidth, latency, jitter, and packet loss by classifying and prioritizing traffic. Voice and video traffic get higher priority than file downloads. Techniques include traffic shaping, policing, queuing, and marking.

Common QoS mechanisms include DiffServ (packet marking), DSCP (priority codes), and traffic policing (drop excess traffic). QoS is essential in enterprise networks for VoIP, video conferencing, and real-time applications that are sensitive to delays.

Related Terms

Anycast
A network routing technique where the same IP address is announced from multiple locations, directing users to the nearest server.
VPN (Virtual Private Network)
A technology that creates an encrypted tunnel between your device and a remote server, securing internet traffic.
Load Balancer
A device or software that distributes network traffic across multiple servers to ensure reliability and performance.
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.
SNMP (Simple Network Management Protocol)
A protocol for monitoring and managing network devices like routers, switches, servers, and printers remotely.
HTTP Keep-Alive
An HTTP mechanism that reuses a single TCP connection for multiple requests, reducing the overhead of establishing new connections.
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