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very high-quality transport service. That s the good news. The bad news is that dedicated facilities tend to be expensive, particularly because the customer pays for them whether they use the facility or not. Unless they are literally using it 100 percent of the time, the network is costing them money. The other downside of a dedicated facility is susceptibility to failure: Should a terrorist backhoe driver decide to take the cable out, there is no alternative route for the traffic to take. It requires some sort of intervention on the part of the service provider that is largely manual. Furthermore, dedicated circuits tend to be inflexible, again, because they are dedicated. Switched resources, on the other hand, work in a different fashion and have their own set of advantages and disadvantages to consider. First and foremost, they require an understanding of the word virtual. When a customer purchases a dedicated facility, he or she literally owns the resources between the two communicating entities as shown in Figure 2-25. Either the circuit itself is physically dedicated to them (common in the 1980s), or a timeslot on a shared physical resource such as a T-Carrier is dedicated to them. Data is placed on the timeslot or the circuit and it travels to the other end of the established facility very simple and straightforward. There is no possibility of a misdelivered message, because the message only has a single possible destination. Imagine turning on the spigot in your front yard to water the plants and having water pour out of your neighbor s hose it would be about that ridiculous. In a switched environment, things work quite differently. In switched networks the only thing that is actually dedicated is a timeslot, because everything in the network that is physical is shared among many different users. Imagine what a wonderful boon to the service providers this technology is: It gives them the ability to properly support the transport requirements of large numbers of customers while selling the same physical resources to them, over and over and over again. Imagine! To understand how this technology works, please refer to Figure 2-26. In this example, device D on the left needs to transmit data to device K on the right. Notice that access to the network resources (the switches in
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Figure 2-25 Point-to-point circuit
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Figure 2-26 A switched network
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the cloud) is shared with three other machines. In order for this to work, each device must have a unique identifier so that the switches in the network can distinguish among all the traffic streams that are flowing through them. This identifier, often called a virtual circuit identifier, is assigned by the Transport Layer as one of its many responsibilities. As examples, X.25, frame relay, and Asynchronous Transfer Mode (ATM) are all switched network technologies that rely on this technique. In X.25 the identifier is called a virtual circuit identifier; in frame relay, a data link connection identifier (DLCI, pronounced Delsey ); and in ATM it is called a virtual circuit identifier as well. Each of these will be described in greater detail later in the book. When device D generates its message to device K for transport across the network, the Transport Layer packages the data for transmission. Among other things, it assigns a logical channel that the ingress switch uses to uniquely identify the incoming data. It does this by creating a unique combination of the unique logical address with the shared physical port to create an entirely unique virtual circuit identifier. When the message arrives at the first switch, the switch enters the logical channel information in a routing table that it uses to manage incoming and outgoing data. There can be other information in the routing table as well, such as quality of service indicators; these details will be covered later, when we discuss the Network Layer (layer three). The technology that a customer uses in a switched network is clearly not dedicated, but it gives the appearance that it is. This is called virtual circuit service, because it gives the appearance of being there when, in fact, it isn t. Virtual private networks (VPNs), for example, give a
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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