A Protocol-based and Architecture-based Perspective
3. Traffic Management and Quality of ServiceControl
3. Traffic Management and Quality of Service Control Protocols are needed for controlling the sending and receiving of messages within the Internet. A protocol may consist of one or several protocol mechanisms. Each of these protocol mechanisms is a method describing a complex sub-function of a protocol. It can be implemented in various communication systems, in different layers and in several protocols. For example, The Internet checksum is a protocol mechanism implemented in TCP, UDP, IP, OSPF, Ethernet, etc. and in different layers of the TCP/IP protocol stacks. In order to develop a new protocol or architecture, it is significantly to have an overview of fundamental protocols and mechanisms. The fundamental mechanisms for traffic management and QoS control will be described in this chapter. Figure 3-1: Basic scenario for data communication over the Internet Supposed that the computer A and B are directly connected via a computer network and will exchange data through this network (figure 3-1). During the data transmission between A and B, transmission errors such as delay, loss, duplication and out-of-date of messages may occur. In order to eliminate these errors, a lot of questions must be answered, for examples: What is the reason for the errors? How should these errors be recognized and recovered? The answer of these questions deals with the protocol mechanisms for error detection and correction. How should senders, receivers and intermediate routers react to overload situations so that the packet losses will be minimal? The solutions for this question deal with the...
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