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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 ACL
A set of rules that control inbound and outbound traffic at the subnet level, acting as a stateless firewall in cloud and enterprise networks.
Network Monitoring
The practice of continuously observing network infrastructure to detect failures, performance degradation, and security threats.
Traceroute
A network diagnostic tool that shows the path packets take from source to destination, listing each hop along the way.
MTU (Maximum Transmission Unit)
The maximum size of a data packet that can be transmitted over a network without fragmentation.
Multicast
A network communication method that sends data to multiple recipients simultaneously without duplicating packets for each recipient.
Port
A numbered endpoint (0-65535) that identifies specific processes or services on a networked computer for communication.
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