Syngress - Eleventh Hour Network+ Exam N10-004 Study Guide (11 ...

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Internet Access Methods 113 EXAM WARNING Other forms of DSL are very-high-speed digital subscriber line (VDSL), high-speed digital subscriber line (HDSL), symmetrical high-speed digital line subscriber (SHDSL), ISDN digital subscriber line (IDSL), and HDSL Second Generation (HDSL-2). You will have to be familiar with ADSL and SDSL not only for the exam but also for your own use if you plan to work on DSL. These are the most commonly used types and will surely be something you will want to know about in more depth if the situation arises where you may be working with this technology. For the exam, you will need to know how to troubleshoot problems with DSL, although DSL itself may not be the problem. Look for misleading types of questions that ask you about DSL technology, although the questions are not essentially focused on that particular technology. The Network+ exam is notorious for these types of scenario questions. Be able to isolate what the cause of a problem may be, whether it be an ISDN, DSL, or WISP (wireless ISP) connection based on the technology and the underlying network – as well as problems may also be occurring there that are misleading you into the wrong answer. Finally, make sure that you remember that DSL and ISDN are both digital technologies, not analog. Cable Modem Broadband cable access requires the use of a modem designed to operate over cable TV lines. Because the coaxial cable used by cable TV provides much greater bandwidth than telephone lines, a cable modem can be used to achieve extremely fast access to the Internet. Cable modems are commonly used in small and home offices. Figure 7.1 shows a typical cable network setup. Characteristics and features of cable modems are as follows: ■ Cable networks provide a shared access to the users on the network, so heavy usage can slow it down, unlike DSL, which has dedicated user access. ■ Because cable networks do not use preexisting phone lines in the home, cable companies will have to install a line into your home (at an additional cost) if one doesn’t already exist. ■ Cable networks provide speeds up to about 10 Mbps. ■ Even with shared access, cable is often faster than ADSL. ■ Cable networks are not available everywhere yet. DSL has more availability at this time than cable networks. EXAM WARNING Some of the most common questions that you are likely to have to solve will be in the form of how to troubleshoot network devices or which one is better and faster than the other. Which one should you use and for what reasons Refer to Chapter 10, which discusses how to troubleshoot networking devices.
114 CHAPTER 7 Wide Area Networking Usually USB or UTP Cable Cable Modem PC Usually Coaxial Cable Carrier Network Internet ISP’s connection to the Internet Cable Network FIGURE 7.1 A typical cable network Table 7.2 Modem Typical Dial-Up Modem Speeds Speed V.90 56 Kbps (receive only) V.34 33.6 Kbps V.32 bis 14.4 Kbps Plain Old Telephone Service/Public Switched Telephone Network PSTN refers to the international telephone system based on copper wires carrying analog voice data. Telephone service carried by the PSTN is often called POTS, which refers to the standard telephone service that most homes use. When referring to either, we are generally referring to dial-up technologies where you would use a dial-up modem to connect to your ISP to get to the Internet. Table 7.2 lists typical dial-modem speeds. Characteristics of POTS/PSTN are as follows: ■ The speeds for dial-up are not very fast, providing speeds up to 56 Kbps. ■ Dial-up is based on the telephone system and use analog lines, whereas both ISDN and DSL are digital.
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xii About the Authors Technical Edi
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20 CHAPTER 2 Network Media DID YOU
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22 CHAPTER 2 Network Media Table 2.
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24 CHAPTER 2 Network Media ■ Perf
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26 CHAPTER 2 Network Media Table 2.
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28 CHAPTER 2 Network Media LAN TECH
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30 CHAPTER 2 Network Media CONNECTO
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34 CHAPTER 2 Network Media problems
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38 CHAPTER 3 Network Devices Table
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42 CHAPTER 3 Network Devices ■
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50 CHAPTER 3 Network Devices Proxy
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56 CHAPTER 4 Wireless Networking
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58 CHAPTER 4 Wireless Networking
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Page 112 and 113: WAN Protocols and Properties 109 In
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164 CHAPTER 10 Network Troubleshoot
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Glossary 177 Access Determines who
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Glossary 179 Extensible Authenticat
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Glossary 181 Oscilloscope A cable t
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Glossary 183 Wireless Network A net
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186 Index Data link layer, 74-75 fu
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188 Index Network troubleshooting,
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