On a wired network slow transfer speeds are usually

Info icon This preview shows pages 73–74. Sign up to view the full content.

View Full Document Right Arrow Icon
On a wired network, slow transfer speeds are usually caused by low grade network cabling.Understand that when you're dealing with a wired network, the higher the grade of the cable, the more tightly the wires within the cable sheath are twisted, and, the tighter the wires are twisted, the more protection the cable has from crosstalk that occurs between the cables. This decreases the number of transmission errors that occur on the network, which increases the overall data transfer rate on the network. For example, if you were to connect a workstation to a gigabit Ethernet network using an older CAT3 network cable, you're not going to get the transfer speeds that you were expecting from the gigabit Ethernet network. Another issue you may encounter is low grade RJ45 plugs and jacks. Not only must the cabling be of an acceptable grade for the network architecture, for example, CAT6, but the RJ45 plugs and jacks must also be of the same grade, once again, CAT6. Verify that your jacks and plugs are rated appropriately, for the type of network and the speed of that network. EMI Issues 7:19-7:52 Now, slow transfer speeds on a wired network could also be caused by EMI. Now, EMI can be experienced when the network cables are run too near electrical devices, such as a ballast on a fluorescent light, or an electric motor. Now, these devices generate a lot of EMI, which can be absorbed by nearby network cabling, and when this happens, the data that was being transmitted on the cable ends up getting corrupted, and the network host will then detect the corruption, and have to re-transmit the data, and that slows everything down. Limited/Local Connectivity 7:53-8:23 Now let's discuss configuration issues that could affect how well the network functions. The first issue is limited or local connectivity. Sometimes users find that they can connect to the local network just fine, but they can't access the Internet. Depending upon the operating system, they may see a notification that they have only localor limited connectivity as a result. Now this situation usually happens when a workstation has been configured to use DHCP to get its IP addressing information. But it can't actually contact the DHCP server. APIPA 8:24-10:05 When this happens, most operating systems including Windows and Linux and Macintosh will fall back to automatic private IP addressing, or a APIPA. APIPA is an implementation of link local IP addressing. A link local address is only valid within the local network segment. Because link local addressing may not be unique outside the local network, most network routers are pre-configured to not forward link local IP packets. So when a network host falls back to APIPA addressing, it automatically assigns itself an IP address,but because that address is a link local address the system has limited connectivity. Basically it can only communicate with other hosts on the same network segment, it cannot communicate with hosts out on the Internet.
Image of page 73

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

View Full Document Right Arrow Icon
Image of page 74
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