And you can also use the probe within the wiring

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And you can also use the probe within the wiring closet to locate the far end of the wire the tone generator's connected to. A sound at the probe indicates that the generated tone has been detected and that the wire that you are touching is the termination point for the wire that you're tracing. Switch Issues 3:53-4:46 So with that in mind, let's now shift gears and look at some switch issues that could cause a lack of network connectivity. For example, lack of network connectivity could be caused by a disabled port on the switch. Understand that for security reasons, many network administrators will actually disable any unused ports on the switch, so, if your workstation ends up being plugged in to one of these disabled switch ports, then you're not going to get any connectivity to the network.
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Another issue you need to be cognizant of is MAC address filtering. If your network switch has MAC address filtering enabled, then it's possible that your workstation system has a MAC address that has not been added to the whitelist on the switch, and if this is the case, it's not going to be allowed to connect to the network, even though there is physical connectivity between the network interface card and the network switch. Network Board Issues 4:47-6:09 So with this in mind, let's also talk about some issues related to network boards within the workstation. Understand that from time to time, you may need to also verify that the network board itself within the workstation is functioning properly, and doing what it's supposed to do. For example, you may need to verify that the correct network board driver has been downloaded and installed on the workstation. If it hasn't, then you need to visit the manufacturer's website and download and install the latest driver. Also, you need to verify that the network board has been configured with an appropriate IP address,subnet mask, gateway router address, and DNS server address. If they haven't you may have physical connectivity, but you will not have logical connectivity with the other host on the network. Then if these things check out, verify that the network board itself is functioning the way it's supposed to. Now this is a problem, because occasionally, network interfaces do fail. And if they fail they have to be replaced, for example, they could be damaged by ESD, they could be damaged by mishandling, they may also be damaged by excess heat in the system,sometimes they just plain old wear out. One of the tools you can use to make sure that the network board is functioning properly is called a loop back adapter. You use a loopback adapter to plug into the network board, and then test the functionality of the board, and it will tell you whether it's doingwhat it's supposed to do. Slow Transfer Speeds 6:10-7:18 Related to the issue of poor connectivity is the issue of slow network transfer speed.
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