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to keep the network up while you’re troubleshooting. (People take it badly when you stop them from working just so you can troubleshoot a problem that they do not consider to be a showstopper.) In this case, you should consider putting a two-port switch in place, which will allow you to give a particular hub or group of hubs a separate party line from the rest (see Figure 9.3). You can get a miniswitch from DataComm Warehouse (www.datacommwarehouse.com), CableExpress (networksnow.com), or any of the mail-order network houses. (As of this writing, NetGear seems to be a reasonably available manufacturer of two-port switches.) Installation is a snap. Disconnect the cascade cable from the second hub, leaving it plugged into the first hub. Plug that cable into port 1 of the switch. Add an additional cable to the switch in port 2. Connect port 2 of the switch to the second hub. Voila! You’re done. Figure 9.3 A small bridge divides the fault domain or collision domain in half, yet users can still operate fairly transparently. Summary Ethernet is a really simple physical networking technology. However, like all networks, it has hard-andfast rules for its design and implementation. Although Ethernet has used many different types of physical cabling in the past, the simplest and most reliable cabling today is UTP. Ethernet is simple to add to, and that simplicity makes it a target for ad hoc additions that can bring the network outside design specifications. This isn’t a big deal with switched networks, because each switch port gives each Ethernet segment (or work-station) its own party line rather than following the rules that apply to larger, cascaded Ethernet networks. <strong>Workshop</strong> Q&A Q Should I use a switch port for every PC? A If you’re very wealthy, go ahead. Most folks, however, like to put a small hub on each switch port and save dedicated switch ports for servers. Q Are there errors other than collisions?
A Collisions cause other errors, such as CRC errors and runts. But on the whole, all errors are collision related. Q Don’t people run their own CAT-V cabling? A Nope. Once something is in the wall, it’s really a pain to replace it, so it makes sense to do it only once. Q The 3-4-5 rule confuses me. Do I really have to learn it? A Not if you’re putting a small hub on each switch port with no additional repeaters. Quiz 1. During normal error-free transmission, there may only be _____ signal(s) on any given Ethernet segment. A. 5 B. 10 C. 2 D. 1 2. What is a collision? A. When two network cards try to transmit simultaneously B. When two network cards develop bad microchips C. When a user accesses the wrong database D. When a user transmits incorrect data 3. True or false? Errors are a normal part of Ethernet operation. 4. True or false? Thinnet, Thicknet, and AUI are the most desirable types of Ethernet you can buy. Answers to Quiz Questions 1. D 2. A 3. True 4. False Previous Table of Contents Next
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To access the contents, click the c
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Workshop Q&A Quiz Answers to Quiz Q
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Eminent Domain TCP/IP Graffiti DHCP
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Configuring Your Proxy Proxy Troubl
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Socks Stuff AOL Instant Messenger A
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Table of Contents Introduction: Get
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about your more complex network iss
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Tell Us What You Think! Table of Co
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with me when I was first getting st
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NIC (network interface card) The te
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MAC Attack Previous Table of Conten
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Routers Previous Table of Contents
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technology as the future of local a
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for a TCP/IP address in a large net
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Sprechen Sie DLC? Previous Table of
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socket 80 of the TCP/IP address 167
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program in a name entry; entering t
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WINS Previous Table of Contents Nex
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kind and spit them out as fast as p
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Previous Table of Contents Next Hou
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Figure 2.1 A simple logical map. If
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Figure 2.4 A physical documentation
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the room). This way, you can read t
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un on the server at 9:50 on Monday
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Previous Table of Contents Next Par
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Beware of Vendor Your vendor probab
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call the risk/benefit ratio—the a
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Workshop Q&A Previous Table of Cont
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If you determine that it’s just o
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(see Figure 4.2). Figure 4.2 An Eth
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Division of Labor Previous Table of
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just that the network itself is at
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A Each situation is obviously diffe
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Ruling out is particularly effectiv
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Drive duplication can be a big help
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Previous Table of Contents Next Aft
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5. When you log problems on a given
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Page 83 and 84: O: Only have tried two other Intern
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Page 91 and 92: Figure 7.1 Searching several sites
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Page 97 and 98: a server but you think it should be
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Page 103 and 104: Name Brand Versus Generic PCs The c
Page 105 and 106: static electricity that may have bu
Page 107 and 108: SIMMs and DIMMs There are two kinds
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Page 111 and 112: This is called looping back, becaus
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Page 115 and 116: Figure 8.4 The NT Task Manager’s
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Page 133 and 134: Follow the Rules: Share and Enjoy!
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Page 137 and 138: Token Analyzers Finding a NAUN is r
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Page 143 and 144: C. 1, 16 D. 4, 16 Answers to Quiz Q
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Page 149 and 150: machine with the username Administr
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Page 155 and 156: Most of the time, you’ll not want
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Page 161 and 162: Figure 11.6 Showing bindings for al
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Page 165 and 166: Figure 11.8 A monitor session. We k
Page 167 and 168: case you need them. 2. What does SM
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Page 173 and 174: The first number is the process ID
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Page 179 and 180: The next thing you need to find out
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A UNIX security and file permission
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the amount of time used or data sen
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NLMs In addition to accepting comma
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NLM Party Previous Table of Content
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Again, make sure you are running th
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Big Monitor Is Watching Previous Ta
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Then, eureka! During one session of
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Protocol Problems Previous Table of
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Figure 13.10 UNICON will configure
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Summary Previous Table of Contents
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7. The TCP/IP protocol and basic se
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ivory-tower stuff, but some of it i
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Configuring in Comfort Previous Tab
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Router 1 in Figure 14.3 is shown in
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to that network. Instead, the next
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Route in Peace: Routing Protocols P
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get to a network segment that until
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Figure 14.4 How two stations talk v
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Tree Trunks Previous Table of Conte
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garbage characters like these on a
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A. Add Router 99 to Router 88’s r
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Let’s lay out some definitions he
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Packet-Filtering Routers Previous T
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eceptionist hangs up one line (the
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from the proxy server without causi
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Proxy Trouble Previous Table of Con
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3. The proxy server resolves the na
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Q My vendor says that its firewall
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Previous Table of Contents Next Par
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• Make checklists of tasks that m
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Joe User Previous Table of Contents
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groups | grep -q -w network && { ec
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If you’re going to add or replace
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Policies Previous Table of Contents
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in this hour—will pay off as you
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Q Which duplication software is rig
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Hour 17 Where Do I Start? Previous
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As optimistic as we’d all like to
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• PCAnywhere • ReachOut • Rem
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IPX/SPX Previous Table of Contents
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Q What happens if I ping the loopba
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correlations? A. netstat -a B. trac
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equire that the application files t
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The File and Print Blues Previous T
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With five potential points of failu
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In some cases, a slight difference
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Application Celebration Previous Ta
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Proto Local Address Foreign Address
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printer 515 Line Printer Daemon (ne
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Previous Table of Contents Next
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Connected to 167.195.160.6. Escape
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Workshop Q&A Q What in the blazes i
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3. A 4. B 5. False 6. B 7. True 8.
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Intranet = Internal The word intran
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Internet Identification Previous Ta
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If an outside machine is “on the
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Here I Ping Again Previous Table of
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Figure 19.6 DNS zones, like the fol
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[rs.internic.net] Registrant: John
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For example, I ran an NFS server on
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• SMTP—Simple Mail Transfer Pro
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Dialout DNS Previous Table of Conte
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3. What does DMZ stand for? A. DNS
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• It’s a way to avoid a Dilbert
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Socks Stuff Previous Table of Conte
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Figure 20.2 The AOL Instant Messeng
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RealPlayer Previous Table of Conten
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external client for proxy support,
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Typical Operation Previous Table of
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scantily, and still others are not
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Not every kind of filter is availab
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important. Your relative or interpa
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Application Antics Previous Table o
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Broken Ring Previous Table of Conte
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creating a segment between the swit
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Q Where can I get an Ethernet mini-
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Figure 22.1 The MG-Soft MIB browser
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the probe has picked up what’s go
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Previous Table of Contents Next Her
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information without the overhead th
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A. Broadcast B. Baseline C. Brag D.
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• Application efficiency • Serv
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Application and Protocol Efficiency
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and so on—is to measure. Everythi
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it a point to say, “Would you sho
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Here are the two types of performan
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Network Statistics Previous Table o
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Q About that latency analysis metho
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Router Configuration Previous Table
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For the second option, you’ll hav
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Automatic for the People Previous T
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are in an unknown location) to conn
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Previous Table of Contents Next The
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C. SYS:SYSTEM\AUTOEXEC.BAT D. SYS:P
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active hub An active hub is one tha
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A TCP-based authentication service
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applications and protocols are base
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An extremely fast network cable tha
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See Internet Group Management Proto
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A device that converts (modulates)
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providers. Point-to-Point Tunneling
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security audit An examination (ofte
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An essential part of a network inte
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Index Symbols A 100 Megabit Etherne
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C new product, 45-46 burned-in addr
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DLC (Data Link Control), 17 DMZ (de
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F fat finger factor, 42-43, 46 fata
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ICQ, 335-336 IMAP (Internet Mail Ap
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M filters, 347-352 LANDecoder, 347
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NetBIOS (Network Basic Input/Output
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network card. See NIC Network Contr
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power supply check, 66 troubleshoot
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Q-R qualitative problems, 58 quanti
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names, 393-394 NetWare, 202 paging
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T dumb terminal mode, 211, 224 full
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isolating soft errors, 135-136 LANa
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U standardizing configuration, 245
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V W upstream, 134 Usenet newsgroups
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autodetection problems, 159 broadca
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