Communication Networks: A Concise Introduction (Synthesis by Jean Walrand, Shyam Parekh

By Jean Walrand, Shyam Parekh

This ebook effects from a long time of training an higher department path on communique networks within the EECS division at collage of California, Berkeley. it really is prompted by means of the perceived desire for an simply available textbook that places emphasis at the middle options at the back of present and subsequent iteration networks. After an outline of ways contemporary net works and a dialogue of the most rules in the back of its structure, we talk about the major rules at the back of Ethernet, WiFi networks, routing, internetworking and TCP. To make the ebook as self contained as attainable, short discussions of likelihood and Markov chain strategies are integrated within the appendices. this is often by means of a quick dialogue of mathematical types that supply perception into the operations of community protocols. subsequent, the most rules at the back of the recent iteration of instant networks in keeping with WiMAX and LTE, and the concept of QoS are provided. A concise dialogue of the actual layer applied sciences underlying a variety of networks is usually incorporated. ultimately, a sampling of themes is gifted that could have major effect at the destiny evolution of networks together with overlay networks like content material supply and peer-to-peer networks, sensor networks, disbursed algorithms, Byzantine contract and resource compression. desk of Contents: the web / ideas / Ethernet / WiFi / Routing / Internetworking / shipping / versions / WiMAX & LTE / QOS / actual Layer / extra themes

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For instance, the designer of the physical layer does not need to consider the applications that will use it. We explain in the chapter Models that the benefits of layering come at a cost of loss of performance. 5 APPLICATION TOPOLOGY Networked applications differ in how hosts exchange information. This section explains the main possibilities. It is possible for a particular networked application to fit the description of more than one mode of information exchange described below. 1 CLIENT/SERVER Web browsing uses a client/server model.

6 23 PUSH/PULL When a user browses the web, his host pulls information from a server. In contrast, push applications send information to user hosts. For instance, a user may subscribe to a daily newspaper that a server forwards according to a schedule when it finds the user’s host available. 7 DISCOVERY In most applications, the user specifies the files he is looking for. However, some applications discover and suggest information for the user. For instance, one application searches for users that are in the neighborhood and are looking for someone to have dinner with.

Some switches that were installed for redundancy get disabled by the protocol. If an active switch or link fails, the spanning tree protocol automatically selects a new tree. Note that, although the spanning tree is composed of shortest paths to the root, the resulting routing may be far from optimal. To see this, imagine a network arranged as a ring with 2N + 1 switches. The two neighboring switches that are at distance N from the switch with the smallest I D communicate via the longest path. 7.

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