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D. route rocket 2. True or false? The Hummingbird socks client (versus the NEC socks client) applies to all applications that are run on the workstation on which it is installed. 3. We used an nslookup command to list all entries in a company’s DNS zone. What was that command? A. netstat -rn company.com B. ls -la company.com C. ls -d company.com D. netstat -d company.com 4. An application can be configured to use UDP or TCP connections. In order to use this application with an outgoing-only firewall, you would have to configure the application to do what? A. Use TCP connections only B. Use UDP connections only C. Use both UDP and TCP connections D. Use neither UDP nor TCP connections Answers to Quiz Questions 1. B 2. True 3. C 4. A Previous Table of Contents Next
Previous Table of Contents Next Hour 21 Tell Me About Your Network: Network Analyzers Sure, most network troubleshooting cases that you’ll encounter will be “elementary, my dear Watson” (solvable by deductive reasoning alone). However, to solve your most hard-boiled network crimes, you’ll need to get a wire tap to give you the evidence you need. Network analyzers provide a type of “wire tap” that allows you to gather objective data about a networking problem. Like a wire tap, network analyzers shouldn’t be used indiscriminately; you definitely want to use your noodle before you use your analyzer. You should always formulate a theory before breaking out the analyzer—otherwise, what are you looking for? (After all, it’s a big network out there.) Still, when you run into a problem that needs an analyzer, it can be the difference between a stone wall and a breakthrough. After you’ve formulated a theory, analyzers can prove your theory by providing you tangible evidence to either sift through yourself or to give to a vendor for analysis. What the Heck Is a Network Analyzer? I have to smile every time I talk about network analyzers: I always think about a piece of network gear reclined on a couch, with some Freudian white-bearded psychoanalyst asking it about its origins. As silly as that seems, this picture isn’t far off—a network analyzer’s primary job is to listen while other network gear talks. Here are the two basic kinds of network analysis tools: • Cable scanners (hardware analyzers) • Packet sniffers (software analyzers) A cable scanner’s primary job is to test the electrical characteristics of your network wire. As we discussed in Hour 9, “Ethernet Basics,” CAT-V cable needs to have certain electrical characteristics, without which you’ll get data link errors. A cable scanner will test any particular cable run “end to end” and let you know if something is out of whack. Some of the more sophisticated scanners will also listen to the signal on the wire to see whether there are physical or data link problems on your network. For example, the only way to truly detect collisions on
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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
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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
Page 267 and 268: equire that the application files t
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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
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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
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Page 307 and 308: 3. What does DMZ stand for? A. DNS
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: external client for proxy support,
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Page 323 and 324: scantily, and still others are not
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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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Page 357 and 358: Here are the two types of performan
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Page 361 and 362: Q About that latency analysis metho
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Page 365 and 366: Router Configuration Previous Table
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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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