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Q Any more tips for TCP/IP discovery without automation tools? A Sure, but isn’t it worth $15 to save a couple of hours of your time? I highly recommend the automated discovery tools. I have lost hours of my life manually discovering networks that I could have otherwise spent doing something fun or productive. One additional thing you can do to dump routing tables if your routers are inaccessible is to load Microsoft’s routing to a test NT server, have it participate in the TCP/IP routing protocols running on your network, and then dump the routing table by typing the following command: netstat -rn You can do a similar thing if you have a Linux box; just add the “gated” package to it, have it listen for RIP, and see if you discover anything. This seems like a lot of work compared to downloading and buying a cheap Windows utility, though, doesn’t it? Quiz 1. The “generator” part of an inductive tone generator/tracer pair should be put where? A. At the “far end,” away from where most cables terminate B. At the “concentrator” end, where most cables terminate C. In the middle of the cable D. None of the above 2. The first thing to find when performing network discovery is the address of a what? A. Server B. Novell file and print service C. Web server D. Router 3. True or false? Once you discover all the routers on your network, it’s a simple matter to map all the servers to where they belong. 4. True or false? All TCP/IP networks use DNS. 5. You can’t find a DNS server for a network that you’ve been hired to reverse-engineer. A sensible way to find host addresses would be to check the ________________ of a functional PC. A. network card B. router entry C. client application configuration D. destination hop 6. True or false? All ports should be scanned on every possible IP address on your network. 7. The RCONSOLE password for a Novell server resides where? A. SYS:SYSTEM\AUTOEXEC.NCF B. SYS:PUBLIC\AUTOEXEC.NCF
C. SYS:SYSTEM\AUTOEXEC.BAT D. SYS:PUBLIC\AUTOEXEC.BAT Answers to Quiz Questions 1. A 2. D 3. True 4. False 5. C 6. False. First you should scan possible IP addresses for a common port and then go back and scan that address for more port possibilities. 7. A 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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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
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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
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
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Page 349 and 350: • Application efficiency • Serv
Page 351 and 352: Application and Protocol Efficiency
Page 353 and 354: and so on—is to measure. Everythi
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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
Page 367 and 368: For the second option, you’ll hav
Page 369 and 370: Automatic for the People Previous T
Page 371 and 372: are in an unknown location) to conn
Page 373: Previous Table of Contents Next The
Page 377 and 378: active hub An active hub is one tha
Page 379 and 380: A TCP-based authentication service
Page 381 and 382: applications and protocols are base
Page 383 and 384: An extremely fast network cable tha
Page 385 and 386: See Internet Group Management Proto
Page 387 and 388: A device that converts (modulates)
Page 389 and 390: providers. Point-to-Point Tunneling
Page 391 and 392: security audit An examination (ofte
Page 393 and 394: An essential part of a network inte
Page 395 and 396: Index Symbols A 100 Megabit Etherne
Page 397 and 398: C new product, 45-46 burned-in addr
Page 399 and 400: DLC (Data Link Control), 17 DMZ (de
Page 401 and 402: F fat finger factor, 42-43, 46 fata
Page 403 and 404: ICQ, 335-336 IMAP (Internet Mail Ap
Page 405 and 406: M filters, 347-352 LANDecoder, 347
Page 407 and 408: NetBIOS (Network Basic Input/Output
Page 409 and 410: network card. See NIC Network Contr
Page 411 and 412: power supply check, 66 troubleshoot
Page 413 and 414: Q-R qualitative problems, 58 quanti
Page 415 and 416: names, 393-394 NetWare, 202 paging
Page 417 and 418: T dumb terminal mode, 211, 224 full
Page 419 and 420: isolating soft errors, 135-136 LANa
Page 421 and 422: U standardizing configuration, 245
Page 423 and 424: V W upstream, 134 Usenet newsgroups
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autodetection problems, 159 broadca
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