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Network Troubleshooting Case Study

Part 1: Troubleshooting a Connection Problem When dealing with a network connectivity issue it’s always best to start at the location closest to the source of the problem. In this case the problem seems to accessing anything remotely from the office computers. Since the office is using a cable modem as their connection to the outside world the troubleshooting should start there. First, check to see that the cable modem is powered up and then verify that the lights on the modem indicate that the modem is online with the provider via the “on-line” status. Moreover; the next step is to contact the service provider to assist with the connection to the outside line if my aforementioned statement is not verified. Assuming that the modem is working the next thing to check is whether the modem appears to be sending traffic by checking the send/receive lights. If that is OK then the next thing to check is the router. First, verify that the router is powered up and shows a connection to the cable modem. In order for the other computers to access the internet they must first access the router. It may be necessary to reboot the router but it should indicate an active internet connection as well as connection lights for each of the seven PCs that are connected. Finally the technician should check the Ethernet cable between the router and the modem as well as all the connections coming into the router to ensure they are showing as actively connected. If troubleshooting all those fails then the technician will need to try additional things like rebooting the cable modem, etc.

Part 2: Troubleshooting Internet Access * Below are ordered steps in the appropriate sequence to help Chris solve this issue: * * Reboot the user’s PC. – Rebooting the user’s PC ensures that all drivers are set and the operating system attempts to create a new connection to the internet service via the router the computer is connected to. This usually eliminates many common problems. * * Check whether other computers on the network have a similar problem. – This is to help narrow the issue down to the user’s PC. If other PCs are fine then the technician can focus the problem on the PC at hand. If others are having issues then further troubleshooting of the cable modem and router will be required. * * Power down the DSL or cable modem box. – This is to allow the connection to the ISP to reconnect if the connection was lost due to any number of reasons. Occasionally this type of hardware does encounter problems and turning the hardware off is the first step in troubleshooting. * * Power down the router. – The router must also be powered down as it is used to connect to the cable modem and then to the service provider. * * Power up the DSL or cable modem box. – Reboot the cable modem and allow it to make a connection to the ISP. Verify that the signal lights are receiving a good signal. * * Power up the router. – Now that the cable modem is connected power on the router and allow it to connect to the cable modem to obtain an external IP address. * * Release and renew the PC’s IP address. – With the router having its external address or gateway address the user’s PC release the current IP address and attempt to obtain a new IP address from the router which typically uses DHCP to assign the PC an internal address which can utilize the external facing gateway address in the router.

*
Part 3: Network Drive Mapping

What menu in Microsoft® Windows Explorer do you use to access the Map Network Drive window? The Windows File Explorer can be used and accessing the Tools menu within it provides the option to map a network drive.
What entry should appear in the folder drop-down list in this window? An option to select the folder to map to: In the drop down the K: drive should be listed along with the drive letter that will be assigned when the drive is successfully mapped. Without using a mapped network drive, what can Jennifer enter into the Run dialog box to access this folder? \\FileServer\SharedFiles Accessing the file server using the syntax above is perfect acceptable. However, the connection will be active until the user reboots at which point they will need to re-establish the connection. This is why mapping the network drive is critical as it provides the option to reconnect to the mapped drive automatically every time the computer is booted.

Part 4 Port Filtering and Forwarding
The following steps can be used when attempting to open port 3090 on the computer. 1. Open the Control Panel and under Administrative Tools open the Windows Firewall application. 2. Select Inbound Rules, Select Action from the menu. 3. Select Add Rule 4. Select Port when prompted for the rule type 5. Next, select the TCP protocol and the checkbox for “Specific Local Ports” 6. Enter 3090 in the port field 7. Select the option to Allow the connection on the next screen 8. Next, when selecting the location to which the rule applies select Domain as the user is on a corporate domain and this will allow the port to be properly exposed for incoming connections 9. Finally, provide a name and/or description for the rule and click finish 10. The port is now open and can accept incoming connections from an external user

REFERENCES:
Articles & Tutorials. (n.d.) WindowsNetworking.com. Network Troubleshooting Tools and Strategies. (n.d.) Copyright © 1996-2014 by Dr. Nikolai Bezroukov

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