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By picking up this book, you ve shown an interest in learning about networking But be forewarned The term networking describes a vast field of study, far too large for any single certification, book, or training course to cover Do you want to configure routers for a living Do you want to administer a large Windows network at a company Do you want to install wide area network connections Do you want to set up Web servers Do you want to secure networks against attacks If you re considering a CompTIA Network+ certification, you probably don t yet know exactly what aspect of networking you want to pursue, and that s okay! You re going to love preparing for the CompTIA Network+ certification Attaining CompTIA Network+ certification provides you three fantastic benefits First, you get a superb overview of networking that helps you decide what part of the industry you d like to pursue Second, it acts as a prerequisite toward other, more advanced certifications Third, the amount of eye-opening information you ll gain just makes getting CompTIA Network+ certified plain old fun Nothing comes close to providing a better overview of networking than CompTIA Network+ The certification covers local area networks (LANs), WANs, the Internet, security, cabling, and applications in a wide-but-not-too-deep fashion that showcases the many different parts of a network, and hopefully tempts you to investigate the aspects that intrigue you by looking into follow-up certifications Both Cisco and Microsoft the two main choices for follow-up training treat CompTIA Network+ as a prerequisite toward at least some of their own certifications, and in some cases provide certification credit for attaining CompTIA Network+ certification These benefits sometimes change, so check out the Cisco (wwwciscocom) and Microsoft (wwwmicrosoftcom) Web sites for details Just do a search for training

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Figure 4-10: DTE/DCE relationship Channel Service Unit (CSU) is a device used in digital transmission; it connects network devices to the local digital telephone loop Data Service Unit (DSU) is a device used in digital transmission that connects the physical interface on the network device to the transmission circuit (for instance, T1) The DSU is also responsible for signal timing These two devices are often referenced together as a CSU/DSU TipCisco does offer serial interfaces with a built-in CSU/DSU on some routers The router can function as both a DTE and DCE An internal CSU/DSU eliminates extra external perimeter devices and cables 2Determine the type of signal being used A standard serial interface is used to connect communication devices such as a CSU/DSU The CSU/DSU then connects to a network device such as a router Some type of signal is needed to allow communication between the CSU/DSU and the router The most common serial-interface signal is the EIA-232 standard (formally known as RS-232) There are other signals, as well, depending on your equipment, distance, and speed requirements The different signals and their corresponding properties are listed in Table 4-6 Table 4-6: Serial Signal Properties

Every version of Ethernet invented since the early 1990s uses a hybrid star-bus topology At the center of the network is a hub This hub is nothing more than an electronic repeater it interprets the ones and zeros coming in from one port and repeats the same signal out to the other connected ports Hubs do not send the same signal back down the port that originally sent it (Figure 4-1) Repeaters are not amplifiers! They read the incoming signal and send new copies of that signal out to every connected port on the hub

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All network technologies break data transmitted between computers into smaller pieces called frames, as you ll recall from 2 Using frames addresses two networking issues First, it prevents any single machine from monopolizing the shared bus cable Second, frames make the process of retransmitting lost data more efficient EXAM TIP The terms frame and packet are often used interchangeably, especially on exams! This book uses the terms more strictly You ll recall from 2, Building a Network with the OSI Model, that frames are based on MAC addresses; packets are generally associated with data assembled by the IP protocol at Layer 3 of the OSI seven-layer model The process you saw in 2 of transferring a word processing document between two computers illustrates these two issues First, if the sending computer sends the document as a single huge frame, it will monopolize the cable and prevent other machines from using the cable until the entire file gets to the receiving system Using relatively small frames enables computers to share the cable easily each computer listens on the segment, sending a few frames of data whenever it detects that no other computer is transmitting Second, in the real world, bad things can happen to good data When errors occur during transmission, the sending system must retransmit the frames that failed to get to the receiving system in good shape If a word-processing document were transmitted as a single massive frame, the sending system would have to retransmit the entire frame in this case, the entire document Breaking the file up

DB-60 DB-60