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chances of you being allowed to touch network gear or get directly outside the firewall in this type of environment are slim to none. Remember: If any of you are caught or killed, the secretary will deny all knowledge of your actions. This book will self-destruct in five seconds. Previous Table of Contents Next
Internet Identification Previous Table of Contents Next More than likely, you have one of the following types of Internet access: • Method 1: Workstation dialup connections only (see Figure 19.1). Figure 19.1 A workstation dialing up to a typical Internet service provider. • Method 2: Firewall or proxy direct to ISP (see Figure 19.2). Figure 19.2 A firewall or proxy server located on your network that’s connected to the ISP. • Method 3: ISP router only, no firewall (see Figure 19.3). Figure 19.3 A router connecting a network directly to an ISP and therefore directly to the Internet (this method is becoming rare due to security concerns). • Method 4: Firewall or proxy, DMZ (demilitarized zone) network to ISP router (see Figure 19.4). Figure 19.4 A typical demilitarized zone setup allows for “permissive” access to public access
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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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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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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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Page 241 and 242: • Make checklists of tasks that m
Page 243 and 244: Joe User Previous Table of Contents
Page 245 and 246: groups | grep -q -w network && { ec
Page 247 and 248: If you’re going to add or replace
Page 249 and 250: Policies Previous Table of Contents
Page 251 and 252: in this hour—will pay off as you
Page 253 and 254: 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
Page 281 and 282: Previous Table of Contents Next
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: Intranet = Internal The word intran
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
Page 315 and 316: RealPlayer Previous Table of Conten
Page 317 and 318: external client for proxy support,
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Page 321 and 322: Typical Operation Previous Table of
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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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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