By Larry L. Peterson
This best-selling and vintage publication teaches you the main rules of computing device networks with examples drawn from the genuine global of community and protocol layout. utilizing the net because the fundamental instance, the authors clarify a number of protocols and networking applied sciences. Their systems-oriented technique encourages you to consider how person community elements healthy right into a higher, complicated method of interactions. no matter what your standpoint, even if or not it's that of an software developer, community administrator, or a clothier of community gear or protocols, you are going to come away with a "big photograph" realizing of the way smooth networks and their functions are equipped. *Completely up to date content material with accelerated assurance of the themes of maximum value to networking execs and scholars, together with P2P, instant, defense, and functions. *Increased specialise in program layer concerns the place cutting edge and interesting learn and layout is at the moment the heart of recognition. *Free downloadable community simulation software program and lab experiments guide to be had.
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Additional resources for Computer Networks: A Systems Approach, Fifth Edition
3. Less commonly, the software running on one of the nodes that handles the packet makes a mistake. For example, it might incorrectly forward a packet out on the wrong link, so that the packet never finds its way to the ultimate destination. As we will see, one of the main difficulties in dealing with lost packets is distinguishing between a packet that is indeed lost and one that is merely late in arriving at the destination. The third class of failure is at the node and link level; that is, a physical link is cut, or the computer it is connected to crashes.
The challenge is to identify abstractions that simultaneously provide a service that proves useful in a large number of situations and that can be efficiently implemented in the underlying system. This is exactly what we were doing when we introduced the idea of a channel in the previous section: we were providing an abstraction for applications that hides the complexity of the network from application writers. 3 Network architecture Abstractions naturally lead to layering, especially in network systems.
That is, a protocol provides a communication service that higher-level objects (such as application processes, or perhaps higherlevel protocols) use to exchange messages. For example, we could imagine a network that supports a request/reply protocol and a message stream protocol, corresponding to the request/reply and message stream channels discussed above. Each protocol defines two different interfaces. First, it defines a service interface to the other objects on the same computer that want to use its communication services.