What is the difference between tos and cos

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All rights reserved. Classify into class according to the precedence of the TOS field of the packet to be forwarded and carry out priority control or bandwidth control through shaping, Dynamic Traffic Control, or CBQ. Terminal Emulation Software. Secure Shell Tools.

Protocol Analyzer. Statistical Tools. Port Scanners. Ping and Traceroute Combinations. DNS Auditing Tools. Traffic and Packet Generators. Chapter 7. Power of the Linux ip, netstat, and route Utilities.

ARP-Related Tools. Chapter 8. Static Routing Concepts. Administrative Distance and Metric. The Near and Far End of a Link. The route Command-Adding and Removing Routes. Route Cloning.

Floating Static Routes. Adding Static Routes via Routing Daemons. Chapter 9. Classification of Dynamic Routing Protocols. Lab RIPv2 Scenario. Introduction to Link-State Routing Protocols. The Art of Redistribution. Lab Route Filtering and Redistribution. Chapter Internet Exchange Points. Lab Route Reflection. Lab Confederation. Avoiding Single Points of Failure.

The opposite of IntServ is DiffServ Differentiated Services where we configure each device separately to prioritize certain traffic. With 6 bits for codepoints we can create a lot of different priorities…in theory, there are 64 possible values that we can choose from. The idea behind PHB Per Hop Behavior is that packets that are marked with a certain codepoint will receive a certain QoS treatment for example queuing, policing or shaping. Throughout the years, there have been some changes to the PHBs and how we use the codepoints.

There was a time when some older network devices would only support IP precedence and newer network devices would use differentiated services. To make sure the two are compatible, we have the class-selector codepoints.

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