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All versions of Windows come with handy tools to test TCP/IP networks Those that you re most likely to use in the field are Ping, IPCONFIG, NSLOOKUP, and TRACERT All of these programs are command prompt utilities You must open a command prompt to run them
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CHAPTER 18 Networking in Windows
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Ping Ping is a great way to determine whether your system can talk to another system Here s how it works Get to a command prompt and type ping followed by an IP address or by a DNS name, such as ping "http://wwwchivalrycom" Press the ENTER key on your keyboard and away it goes Figure 1814 shows the common syntax for Ping
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MIKE MEYERS A+ CERTIFICATION PASSPORT
IPCONFIG Windows 2000/XP offer the command line tool IPCONFIG for a quick glance at your network settings Click Start | Run and type cmd to get a command prompt From the prompt, type ipconfig /all to see all of your TCP/IP settings (Figure 1815) When you have a static IP address, IPCONFIG does little beyond reporting your current IP settings, including your IP address, subnet mask, default gateway, DNS servers, and WINS servers When using DHCP, however, IPCONFIG is also the primary tool for releasing and renewing your IP address Just type ipconfig /renew to get a new IP address or ipconfig /release to give up the IP address you currently have NSLOOKUP NSLOOKUP is a powerful command line program that enables you to determine exactly what information the DNS server is giving you about a specific host name Every version of Windows makes NSLOOKUP available when you install TCP/IP To run the program, type nslookup from the command line and press the ENTER key (Figure 1816) Note that this gives you a little information, but that the prompt has changed That s because you re running the application Type exit and press the ENTER key to return to the command prompt
FIGURE 1815
IPCONFIG /ALL on Windows 2000
CHAPTER 18 Networking in Windows
FIGURE 1816
NSLOOKUP in action
Travel Advisory
You can do some cool stuff with NSLOOKUP, and consequently some techs love the tool It s way outside the scope of CompTIA A+ certification, but if you want to play with it, type help at the NSLOOKUP prompt and press ENTER to see a list of common commands and syntax
TRACERT The TRACERT utility shows the route that a packet takes to get to its destination From a command line, type tracert followed by a space and an IP address or DNS name The output describes the route from your machine to the destination machine, including all devices it passes through and how long each hop takes (Figure 1817) TRACERT can come in handy when you have to troubleshoot bottlenecks When users complain that it s difficult to reach a particular destination using TCP/IP, you can run this utility to determine whether
FIGURE 1817
TRACERT in action
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the problem exists on a machine or connection over which you have control, or if it is a problem on another machine or router
Steps for Configuring TCP/IP
By default, TCP/IP is configured to receive an IP address automatically from a DHCP server on the network (and automatically assign a corresponding subnet mask) As far as the CompTIA A+ certification exams are concerned, Network+ techs and administrators give you the IP address, subnet mask, and default gateway information and you plug them into the PC That s about it, so here s how to do it manually: 1 In Windows XP, open the Control Panel and double-click the Network Connections applet Double-click the Local Area Connection icon In Windows 2000, click Start | Settings | Network and Dial-up Connections, and double-click the Local Area Connection icon 2 Click the Properties button, highlight Internet Protocol (TCP/IP), and click the Properties button 3 In the dialog box, click the Use the following IP address radio button 4 Enter the IP address in the appropriate field 5 Press the TAB key to skip down to the Subnet mask field Note that the subnet mask is entered automatically (you can type over this if you want to enter a different subnet mask) See Figure 1818
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