Workshop

More documents

Recommendations

Info

primary mycompany.com named.company cache root.cache forwarders 192.168.1.10 This will point you to the data files. (In this case, this is a primary name server; it keeps its database for the zone in the named.company file. Because there’s a “directory” keyword in the boot file, you’ll specifically find the data file in /usr/local/named/named.company rather than in /etc directory, which is the default.) Previous Table of Contents Next
Automatic for the People Previous Table of Contents Next A couple of network discovery tools are available for your use. They are very useful and usually cost less than $100, making them, in my opinion, quite a bargain for what they allow you to accomplish. They work by performing the tasks that you or I would do: running traceroutes, performing name lookups, opening sockets on a destination to see whether they’re listening, and so on. However, because a computer has infinite patience doing the most boring and repetitive of tasks, a network discovery tool is much more complete than you or I would be! In particular, these automatic network discovery tools will take a range of IP addresses and systematically ping and check many common service ports on each destination. For a large network, this can be tens of thousands of checks (assuming that it checks twenty or so services on each destination, and that there are 254 possible host numbers on a network, and that you have a couple of networks). What’s more, if you leave your automatic discovery tool running overnight, you’ll have lots of answers in the morning without losing a bit of sleep! What about proprietary socket numbers for services such as Lotus Notes or GroupWise? Don’t worry about them. Once you identify that a server is running at a certain IP address, you can do a more thorough port scan (see Figure 24.4). Figure 24.4 Port scanners such as the Internet Anywhere Toolkit can discover “listening” ports on a server, out of thousands of possibilities. Here’s the rule of thumb: Even though it’s possible to scan every single port in the world using these tools, you’re probably best off scanning for a common “server” port, such as telnet (23), SMTP (25), or NetBIOS (139), on all addresses and then performing a more thorough scan on a machine once you find one that offers a common service. SNMP scanners are also pretty good for network discovery. Although SNMP is a UDP service and therefore can’t have a “connection,” a program that “understands” SNMP can send SNMP datagrams to a range of TCP/IP addresses and report to you which ones respond. Those that do are likely servers, routers, switches, or “smart” hubs.
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 and 38:
kind and spit them out as fast as p
Page 39 and 40:
Previous Table of Contents Next Hou
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
Page 49 and 50:
Previous Table of Contents Next Par
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
Page 57 and 58:
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
Page 63 and 64:
Division of Labor Previous Table of
Page 65 and 66:
just that the network itself is at
Page 67 and 68:
A Each situation is obviously diffe
Page 69 and 70:
Page 71 and 72:
Ruling out is particularly effectiv
Page 73 and 74:
Drive duplication can be a big help
Page 75 and 76:
Previous Table of Contents Next Aft
Page 77 and 78:
5. When you log problems on a given
Page 79 and 80:
if they have a plan, they are going
Page 81 and 82:
Is It a Virus, Doc? Previous Table
Page 83 and 84:
O: Only have tried two other Intern
Page 85 and 86:
A Remember that what a user says is
Page 87 and 88:
Page 89 and 90:
Previous Table of Contents Next Loo
Page 91 and 92:
Figure 7.1 Searching several sites
Page 93 and 94:
You’ll also find forums run by th
Page 95 and 96:
Previous Table of Contents Next
Page 97 and 98:
a server but you think it should be
Page 99 and 100:
Workshop Q&A Previous Table of Cont
Page 101 and 102:
Page 103 and 104:
Name Brand Versus Generic PCs The c
Page 105 and 106:
static electricity that may have bu
Page 107 and 108:
SIMMs and DIMMs There are two kinds
Page 109 and 110:
Page 111 and 112:
This is called looping back, becaus
Page 113 and 114:
Windows Previous Table of Contents
Page 115 and 116:
Figure 8.4 The NT Task Manager’s
Page 117 and 118:
UNIX Previous Table of Contents Nex
Page 119 and 120:
Probably the most important thing t
Page 121 and 122:
Hour 9 Ethernet Basics Previous Tab
Page 123 and 124:
which translates into lots of colli
Page 125 and 126:
it currently requires fiber-optic c
Page 127 and 128:
designation is simply an industry-s
Page 129 and 130:
Down, Down, Down Previous Table of
Page 131 and 132:
A Collisions cause other errors, su
Page 133 and 134:
Follow the Rules: Share and Enjoy!
Page 135 and 136:
Previous Table of Contents Next Err
Page 137 and 138:
Token Analyzers Finding a NAUN is r
Page 139 and 140:
Token-Ring does not have any hard-a
Page 141 and 142:
Down Town Previous Table of Content
Page 143 and 144:
C. 1, 16 D. 4, 16 Answers to Quiz Q
Page 145 and 146:
Going Native Although Windows allow
Page 147 and 148:
Eminent Domain Previous Table of Co
Page 149 and 150:
machine with the username Administr
Page 151 and 152:
protocol. They therefore relied on
Page 153 and 154:
Previous Table of Contents Next Fol
Page 155 and 156:
Most of the time, you’ll not want
Page 157 and 158:
allows you to manage them and check
Page 159 and 160:
Binding Previous Table of Contents
Page 161 and 162:
Figure 11.6 Showing bindings for al
Page 163 and 164:
Informational Commands Previous Tab
Page 165 and 166:
Figure 11.8 A monitor session. We k
Page 167 and 168:
case you need them. 2. What does SM
Page 169 and 170:
a great example of client/server. W
Page 171 and 172:
Previous Table of Contents Next Alt
Page 173 and 174:
The first number is the process ID
Page 175 and 176:
tcp 0 0 frotz.frob.com.telnet 200.1
Page 177 and 178:
Name Game Previous Table of Content
Page 179 and 180:
The next thing you need to find out
Page 181 and 182:
A UNIX security and file permission
Page 183 and 184:
Page 185 and 186:
the amount of time used or data sen
Page 187 and 188:
NLMs In addition to accepting comma
Page 189 and 190:
NLM Party Previous Table of Content
Page 191 and 192:
Again, make sure you are running th
Page 193 and 194:
Big Monitor Is Watching Previous Ta
Page 195 and 196:
Then, eureka! During one session of
Page 197 and 198:
Protocol Problems Previous Table of
Page 199 and 200:
Figure 13.10 UNICON will configure
Page 201 and 202:
Summary Previous Table of Contents
Page 203 and 204:
7. The TCP/IP protocol and basic se
Page 205 and 206:
ivory-tower stuff, but some of it i
Page 207 and 208:
Configuring in Comfort Previous Tab
Page 209 and 210:
Router 1 in Figure 14.3 is shown in
Page 211 and 212:
to that network. Instead, the next
Page 213 and 214:
Route in Peace: Routing Protocols P
Page 215 and 216:
get to a network segment that until
Page 217 and 218:
Figure 14.4 How two stations talk v
Page 219 and 220:
Tree Trunks Previous Table of Conte
Page 221 and 222:
garbage characters like these on a
Page 223 and 224:
A. Add Router 99 to Router 88’s r
Page 225 and 226:
Let’s lay out some definitions he
Page 227 and 228:
Packet-Filtering Routers Previous T
Page 229 and 230:
eceptionist hangs up one line (the
Page 231 and 232:
from the proxy server without causi
Page 233 and 234:
Proxy Trouble Previous Table of Con
Page 235 and 236:
3. The proxy server resolves the na
Page 237 and 238:
Q My vendor says that its firewall
Page 239 and 240:
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:
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
Page 299 and 300:
[rs.internic.net] Registrant: John
Page 301 and 302:
For example, I ran an NFS server on
Page 303 and 304:
• SMTP—Simple Mail Transfer Pro
Page 305 and 306:
Dialout DNS Previous Table of Conte
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,
Page 319 and 320: Previous Table of Contents Next Hou
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-
Page 339 and 340: Figure 22.1 The MG-Soft MIB browser
Page 341 and 342: the probe has picked up what’s go
Page 343 and 344: Previous Table of Contents Next Her
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
Page 353 and 354: and so on—is to measure. Everythi
Page 355 and 356: it a point to say, “Would you sho
Page 357 and 358: Here are the two types of performan
Page 359 and 360: Network Statistics Previous Table o
Page 361 and 362: Q About that latency analysis metho
Page 365 and 366: Router Configuration Previous Table
Page 367: For the second option, you’ll hav
Page 371 and 372: are in an unknown location) to conn
Page 373 and 374: Previous Table of Contents Next The
Page 375 and 376: C. SYS:SYSTEM\AUTOEXEC.BAT D. SYS:P
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
Page 425 and 426:
autodetection problems, 159 broadca
show all

Workshop

Create successful ePaper yourself

Delete template?

Save as template?