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MODULE 9: QoS Concepts, image, image, image, image - Coggle Diagram
MODULE 9: QoS Concepts
9.4 QoS Models
3.- Use in modern networks:
- Although DiffServ is the most widely used model due to its scalability, in some situations it is combined with IntServ and RSVP to improve quality of service for delay-sensitive traffic.
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2.- Model comparison:
- Best effort is the simplest, but it does not guarantee quality of service.
- IntServ offers guaranteed QoS, but it is resource-intensive and does not scale well.
- DiffServ is more flexible and scalable, but it does not guarantee end-to-end QoS.
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- QoS Models
- Best Effort: Offers no guarantees and treats all packets equally.
- Integrated Services (IntServ): Provides end-to-end QoS with resource reservation, but is not very scalable.
- Differentiated Services (DiffServ): Classifies and prioritizes traffic without the need for end-to-end signaling, making it more scalable.
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9.3 Queuing Algorithms
FIFO (First-In, First-Out)
Operation: Packets are transmitted in the order they arrive.
Use: Fast, congestion-free links.
Limitation: Does not prioritize critical traffic.
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CBWFQ (Class-Based WFQ)
How it works: User-defined queues with guaranteed bandwidth.
Advantage: Granular control for applications (e.g., VPN, streaming).
Limitation: No strict priority for voice/video.
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