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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

Network Monitoring
The practice of continuously observing network infrastructure to detect failures, performance degradation, and security threats.
HTTPS Everywhere
The practice of securing all web traffic with TLS encryption, ensuring data integrity and privacy between browsers and servers.
Overlay Network
A virtual network built on top of an existing physical network, enabling features like container networking and VPNs.
DNS (Domain Name System)
A hierarchical naming system that translates human-readable domain names into IP addresses.
HTTP/HTTPS
The protocol used for transferring web pages and data between browsers and servers, with HTTPS adding encryption.
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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