Heres the issue if one of these devices goes downthen

Info icon This preview shows pages 72–73. Sign up to view the full content.

View Full Document Right Arrow Icon
responding, including your network switches, your routers, your DHCP servers and your DNS server. Here's the issue, if one of these devices goes down,then you have poor network connectivity because the services they provide will be gone. Link Status 1:00-1:55 Now if you don't find any problems when you check the basics then you need to start investigatingmore complex issues that could be affecting connectivity. For example, you should verify that the link between the computer and the network switch is active. A really easy way to do this is to check for link lights on both the network interface card on the workstation, and on the associated port on the network switch. If the link light is lit, then you know that a basic degree of connectivity exists between the switch and the computer. Now you could also use a cable tester or a cable certifier to actually test the cable itself, and make sure that it's working correctly between the workstation and the switch. Now, if you don't see a link light, but a cable tester indicates that the network cable itself is working just fine, then you need to look at other networking components to try to troubleshoot the source of the problem, for example, you may need to verify that the wall jack that the cable is connected to is working correctly. Wall Jacks 1:56-2:12 It is possible for a wall jack to be damaged by chairs, drawers and carts and so on, and these things can cause poor connectivity. You can an RJ-45 tester to verify that the wall jack is functioning correctly, and also, that it supports your current networking standards, such as gigabit Ethernet. Wiring Issues 2:13-3:52 Now sometimes, the network wiring behind the wall can become damaged as well, which will also cause a loss of connectivity. Because the damaged portion of the wire is behind the wall, or maybe even in the ceiling, it can be really difficult to locate. One tool that you can use to identify where the damage exists in the cable is to use a toner probe, now, a toner probe is composed of two devices that are used together to trace the wire from a known end point such as the wall jack, to the termination point in the wiring closet. One part of the toner probe just sends a musical tone through the wire, this is called the tone generator. The other part of the toner probe picks up the tone at points along the wire or even at it's far end.This is called the probe. When the probe's tip is close to or even touching the wire that carries the tone, you hear an audible tone. To use a toner probe, you first need to connect the tone generator to one end of the wire being tested. For example, you could use the RJ45 plug on the tone generator to connect it to the RJ45 wall jack, then you turn the tone generator on, so it begins transmitting the tone signal on the wire. Then you can use the toner probe to detect the signal through the wall. Basically allowing you to trace the wire. Now here's the key thing to remember, if the tone disappears on the wire, this is a problem,because it could indicate the exact location where the wire is damaged.
Image of page 72

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 73
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern