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elated, or related to an entirely different server (as with the CD-ROM server in a previous example). Although it’s possible for a Web server to run out of gas, this is not true for the majority of intranet servers. Good documentation and staying current on operating system and Web server patch levels can help you avoid or resolve many problems in this arena. <strong>Workshop</strong> Q&A Q I’ve read that the Internet at large uses different routing protocols than a typical local area network, so how can troubleshooting techniques on my intranet apply to Internet troubleshooting? A True, the routers on the Internet are major beefcakes, and I hear that some of them use steroids. Although they’re drugged drones, they still must obey basic rules of routing: A packet that comes in on one interface must be routed to another interface and passed off to the “next hop” or dropped if the destination is unreachable. Seriously, the routing protocols are merely methods of routing table updates—as such, they don’t matter to us, because we’re not ISPs. We just care about pointing to the trouble and reporting it. If a packet isn’t doing what it’s supposed to be doing according to a traceroute, we have a reportable problem, and that’s where our responsibility ends. Here’s the bottom line: Let the ISPs worry about the routing protocols, just so long as they route our packets properly. Q My proxy server connects straight to my ISP via a leased line, and I cannot use ping, traceroute, and nslookup through it. I’d like to be able to troubleshoot my own problems, but I have no DMZ and my firewall’s getting in the way! Any suggestions? A Get a dialup account from your ISP (you might even be able to get a freebie if you have a big and expensive leased line for the main part of your business) and troubleshoot using that. The dialup account will allow you to be on the ISP’s DMZ, and you should be able to use standard troubleshooting procedures from there. Quiz 1. What does ISP stand for? A. Internet supplier partner B. Internet service provider C. Internal stud professional D. Interior service provider 2. Which of the following is a legitimate way of connecting to an ISP? A. Workstation dialup connections B. Firewall or proxy direct to ISP C. Neither A nor B D. Both A and B
3. What does DMZ stand for? A. DNS main zone B. Demilitarized zone C. Demilitarized zebras D. DNS mystical zodiac 4. What’s the main tool for resolving DNS problems? A. dnslookup B. nslookup C. ping D. traceroute 5. If the DNS server you’ve queried doesn’t know the answer to your question, what must it do? A. Scream and cry B. Ask one of your internal file servers C. Ask its “parent” zone server D. Ask the ISP 6. True or false? An SOA contains information about a zone’s name servers and point of contact. 7. To look up the hostname for the host 167.195.160.6, you would fire up nslookup and type set type=ptr and then type what? A. 167.195.160.6.in-addr.arpa B. 6.160.195.167.in-addr.arpa C. 6.160.195.167.in-reverse.arpa D. 167.195.160.6.in-address.arpa Answers to Quiz Questions 1. B 2. D 3. B 4. B 5. C 6. True 7. B 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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if they have a plan, they are going
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Is It a Virus, Doc? Previous Table
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O: Only have tried two other Intern
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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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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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Previous Table of Contents Next
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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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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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• 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
Page 255 and 256: Hour 17 Where Do I Start? Previous
Page 257 and 258: As optimistic as we’d all like to
Page 259 and 260: • PCAnywhere • ReachOut • Rem
Page 261 and 262: IPX/SPX Previous Table of Contents
Page 263 and 264: Q What happens if I ping the loopba
Page 265 and 266: correlations? A. netstat -a B. trac
Page 267 and 268: equire that the application files t
Page 269 and 270: The File and Print Blues Previous T
Page 271 and 272: With five potential points of failu
Page 273 and 274: In some cases, a slight difference
Page 275 and 276: Application Celebration Previous Ta
Page 277 and 278: Proto Local Address Foreign Address
Page 279 and 280: printer 515 Line Printer Daemon (ne
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Page 283 and 284: Connected to 167.195.160.6. Escape
Page 285 and 286: Workshop Q&A Q What in the blazes i
Page 287 and 288: 3. A 4. B 5. False 6. B 7. True 8.
Page 289 and 290: Intranet = Internal The word intran
Page 291 and 292: Internet Identification Previous Ta
Page 293 and 294: If an outside machine is “on the
Page 295 and 296: Here I Ping Again Previous Table of
Page 297 and 298: Figure 19.6 DNS zones, like the fol
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Page 301 and 302: For example, I ran an NFS server on
Page 303 and 304: • SMTP—Simple Mail Transfer Pro
Page 305: Dialout DNS Previous Table of Conte
Page 309 and 310: • It’s a way to avoid a Dilbert
Page 311 and 312: Socks Stuff Previous Table of Conte
Page 313 and 314: Figure 20.2 The AOL Instant Messeng
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Page 317 and 318: external client for proxy support,
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Page 323 and 324: scantily, and still others are not
Page 325 and 326: Not every kind of filter is availab
Page 327 and 328: important. Your relative or interpa
Page 329 and 330: Application Antics Previous Table o
Page 331 and 332: Broken Ring Previous Table of Conte
Page 333 and 334: creating a segment between the swit
Page 335 and 336: Q Where can I get an Ethernet mini-
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Page 339 and 340: Figure 22.1 The MG-Soft MIB browser
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Page 345 and 346: information without the overhead th
Page 347 and 348: A. Broadcast B. Baseline C. Brag D.
Page 349 and 350: • Application efficiency • Serv
Page 351 and 352: Application and Protocol Efficiency
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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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