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Networking technicians need to know how to use the tools that are available to monitor network performance and connectivity A network administrator will set up the tools you use, but a tech needs to know how to use those tools to create baselines, monitoring utilities, and logs of various sorts The tools vary from operating system to operating system, but let s look at the two most commonly in use: Performance Monitor and Event Viewer, both Windows utilities EXAM TIP Windows Vista calls the tool Reliability and Performance Monitor It functions similarly to the Windows XP tool, though the screens differ a little Vista calls the log files Data Collector Sets, though a log file by any other name is still a log file Administrators use Performance Monitor (also called PerfMon) to view the behavior of hardware and other resources on Windows machines, either locally or remotely Performance Monitor can monitor both real-time and historical data about the performance of your systems Figure 18-8 shows the default Performance Monitor in Windows XP

Cisco's discovery protocol is a valuable aid for determining which devices are adjacent You use the following show cdp neighbor command: router#sh cdp nei Capability Codes: R - Router, T - Trans Bridge, B Source Route Bridge S - Switch, H - Host, I - IGMP, r - Repeater Device ID LocalIntrfce Holdtme Capability Platform Port ID vsitest4 Tok 0 136 R 4500 Tok 1 Switch1 Eth 1 155 S WS-C2924M Fas 0/8 vsitest7 Tok 1 174 R RSP2 Tok 6/0 router# This example shows sample output from a show cdp neighbor command It tells you that there are three adjacent devices advertising using cdp It gives information about the port in the local router, and the port to which each interface is connected on the other end Such information may be helpful in determining how an interface modification might affect the immediate neighboring devices in your network

NOTE CompTIA Network+ is not going to test you on using Performance Monitor or any other single baselining tool Just make sure you understand what a baseline does for you Once you access Performance Monitor, you need to configure it to display data To do that accurately, you set objects, counters, and views An object, in Performance Monitor terms, is a system component that you want to monitor, such as the processor or the memory Each object has different measurable features, called counters Counters, in other words, are the aspects of an object that

In the early days, all of this probably seemed like a neat little trick that could be used to solve obscure equations, and not much more than that But in reality it opened up a Pandora s box of possibilities that is still being dealt with today It turns out that an entire branch of analysis called complex analysis can be constructed, which really supersedes real analysis Complex analysis has not only transformed the world of mathematics, but surprisingly, we nd its application in many areas of physics and engineering For example, we can use complex numbers to describe the behavior of the electromagnetic eld In atomic systems, which are described by quantum mechanics, complex numbers and complex functions play a central role, and actually appear to be a fundamental part of nature Complex numbers are often hidden For example, as we ll see later, the trigonometric functions can be written down in surprising ways like: cos = ei + e i 2 sin = ei + e i 2i

Your router can be monitored or configured from a Web browser interface Use the ip http server command to turn the router into a Web server of sorts From virtually any Web browser, you can view some basic parameters as well as configure the device router(config)#ip http server This command turns on the http server on the router To view the router in a browser, enter the IP address or host name of this router in the URL line of the browser You'll see something similar to Figure A-4