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that can be carried out before installers appear and begin working In the case of a hub or switch, for example, the plan should associate each computer with a complete path back to the cabling at the hub or switch through all the panels, horizontal feeds, and risers In locations where it is not practical to install cable runs, wireless links can be implemented via APs or bridges
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Once the network is set up with cable connections from each computer to a hub, connectivity can be checked by opening Windows Explorer and viewing either Network Neighborhood (Windows 95/98/ME) or My Network Places (Windows XP) All computers that are configured to belong to the same workgroup should be listed If they are not, make sure that firewall software is not running on the computers that are expected to show up on the network this will hide them from view, and prevent file and printer sharing This includes the ICF that comes with Windows XP as well as any third-party firewall software If you still have a problem viewing computers on the network, run the ping utility that comes with Windows Ping is a simple test function that is used to check if a local or remote system on an IP network is currently in operation The easiest way to use ping is to run it from the Windows command line (accessed under Run) It can also be accessed from the command prompt found under Accessories in the program list The ping command is run using plain language domain names or IP addresses The general command-line syntax for implementing ping is
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ping nathan or ping 1921681002
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This will indicate whether the computer named Nathan is currently online Ping will furnish the IP address assigned to Nathan as well (see Figure 3-20) Ping can also be used to check the operation or connectivity to a cable/DSL modem, router, web site, and DNS server any addressable device on the internal network or the public Internet The ping command sends one datagram per second and displays one line of output for every echo response returned If the target computer is out of service or the connection is bad, no echo is returned Instead, the ping function times out, indicating a problem With just ping, however, it cannot be determined whether the problem is with the target computer or the connection Further investigation is
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Setting Up the Network
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Figure 3-20 When the ping command is run from the Windows command line, packets are sent to the target computer (Nathan) and echoed back, indicating that the connection is good and that the target computer is online
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required to isolate the source of the problem If the ping command fails, verify that the remote host IP address is correct, that the remote host is operational, and that all of the gateways (routers) between the computer and the remote host are operational If you still have a problem running the ping command, it could be that the packet-filtering policies on routers, firewalls, or other types of security gateways might prevent ping requests from reaching their destination There could also be a problem with the cable or connectors somewhere between the source and target computers and the hub on the internal network Some problems with cable include breaks, miswires, shorts, or cross pins Faulty NICs are another possible problem To test for these and other problems on an internal network, a portable Ethernet cable tester can be used (see Figure 3-21), especially for verifying network connections
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Figure 3-21 An Ethernet cable tester with a remote unit from Cables N Mor
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during the initial installation and whenever moves, adds, and changes occur Some testers can also provide measurements of cable length to ensure they meet specifications The test unit itself has a master and remote component into which both ends of the cable are inserted The tester supplies the electrical power to drive signals across the cable so anomalies can be detected
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