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4. B 5. True 6. Duplicate 7. 26; 200.1.5 8. True 9. B or C Previous Table of Contents Next
Previous Table of Contents Next Hour 2 You Can’t Have Too Much Documentation, Money, or Love! Would you start out on a car trip in a strange country without a map? Of course you wouldn’t, but this is what people do every day when they fail to document their ever-expanding networks. When it comes time to troubleshoot, those who don’t have a map to go by will just shrug and shake their heads. Undocumented networks are mostly incomprehensible. You need some method of getting your bearings, and network documentation can be an compass in what can be a sea of confusion. Navigating a Bad Network Neighborhood There will be those who tell you that complete documentation is too much trouble, or that it takes too much time and doesn’t buy you all that much. This is utter hogwash. (Although many gray areas exist in network troubleshooting, this is one issue that is utterly black and white.) Folks without documented networks are the ones running around with their hair on fire while others with documented networks have fixed the problem, gone to lunch, done something productive, and gone home to spend time with their kids. This may sound rather judgmental, but there’s just too much evidence that suggests that you either document once and have a reference during times of trouble or you fail to document at all and end up having to figure out something multiple times during each crisis. Not only does insufficient documentation waste time when your network is having problems, but it also causes unnecessary fear and confusion during the crisis. You owe it to yourself to have as clear a situation as possible when you start to troubleshoot—believe me, there’s enough uncertainty and doubt when you’re trying to find your way out of a bad network neighborhood without adding to it due to a lack of a good map. Documentation Dividends Enough with the dire warnings and horror stories! Let’s set aside all the negatives due to a lack of documentation. On the positive side, you can see tangible benefits to having an acceptable level of documentation. Perhaps the one benefit you’ll appreciate most is that a documented network is a network from which you can walk away. You can take a vacation from a documented network without worrying about whether you’re going to be called if something goes wrong. Because you’re not the only person with access to information about how your network is set up, others can deal with it while you watch the
Page 1 and 2: To access the contents, click the c
Page 3 and 4: Workshop Q&A Quiz Answers to Quiz Q
Page 5 and 6: Eminent Domain TCP/IP Graffiti DHCP
Page 7 and 8: Configuring Your Proxy Proxy Troubl
Page 9 and 10: Socks Stuff AOL Instant Messenger A
Page 11 and 12: Table of Contents Introduction: Get
Page 13 and 14: about your more complex network iss
Page 15 and 16: Tell Us What You Think! Table of Co
Page 17 and 18: with me when I was first getting st
Page 19 and 20: NIC (network interface card) The te
Page 21 and 22: MAC Attack Previous Table of Conten
Page 23 and 24: Routers Previous Table of Contents
Page 25 and 26: technology as the future of local a
Page 27 and 28: for a TCP/IP address in a large net
Page 29 and 30: Sprechen Sie DLC? Previous Table of
Page 31 and 32: socket 80 of the TCP/IP address 167
Page 33 and 34: program in a name entry; entering t
Page 35 and 36: WINS Previous Table of Contents Nex
Page 37: kind and spit them out as fast as p
Page 41 and 42: Figure 2.1 A simple logical map. If
Page 43 and 44: Figure 2.4 A physical documentation
Page 45 and 46: the room). This way, you can read t
Page 47 and 48: un on the server at 9:50 on Monday
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Page 51 and 52: Beware of Vendor Your vendor probab
Page 53 and 54: call the risk/benefit ratio—the a
Page 55 and 56: Workshop Q&A Previous Table of Cont
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Page 59 and 60: If you determine that it’s just o
Page 61 and 62: (see Figure 4.2). Figure 4.2 An Eth
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Page 65 and 66: just that the network itself is at
Page 67 and 68: A Each situation is obviously diffe
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Page 73 and 74: Drive duplication can be a big help
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Page 77 and 78: 5. When you log problems on a given
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Page 83 and 84: O: Only have tried two other Intern
Page 85 and 86: A Remember that what a user says is
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Previous Table of Contents Next Loo
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Figure 7.1 Searching several sites
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You’ll also find forums run by th
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Previous Table of Contents Next
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a server but you think it should be
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Workshop Q&A Previous Table of Cont
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Previous Table of Contents Next Par
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Name Brand Versus Generic PCs The c
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static electricity that may have bu
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SIMMs and DIMMs There are two kinds
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This is called looping back, becaus
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Windows Previous Table of Contents
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Figure 8.4 The NT Task Manager’s
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UNIX Previous Table of Contents Nex
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Probably the most important thing t
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Hour 9 Ethernet Basics Previous Tab
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which translates into lots of colli
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it currently requires fiber-optic c
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designation is simply an industry-s
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Down, Down, Down Previous Table of
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A Collisions cause other errors, su
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Follow the Rules: Share and Enjoy!
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Previous Table of Contents Next Err
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Token Analyzers Finding a NAUN is r
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Token-Ring does not have any hard-a
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Down Town Previous Table of Content
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C. 1, 16 D. 4, 16 Answers to Quiz Q
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Going Native Although Windows allow
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Eminent Domain Previous Table of Co
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machine with the username Administr
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protocol. They therefore relied on
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Previous Table of Contents Next Fol
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Most of the time, you’ll not want
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allows you to manage them and check
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Binding Previous Table of Contents
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Figure 11.6 Showing bindings for al
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Informational Commands Previous Tab
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Figure 11.8 A monitor session. We k
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case you need them. 2. What does SM
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a great example of client/server. W
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Previous Table of Contents Next Alt
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The first number is the process ID
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tcp 0 0 frotz.frob.com.telnet 200.1
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Name Game Previous Table of Content
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The next thing you need to find out
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A UNIX security and file permission
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Previous Table of Contents Next Hou
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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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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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