tailieunhanh - CompTIA Network+ Certification Study Guide part 8

CompTIA’s Network+ certification Study Guide part 8 is a globally-recognized, vendor neutral exam that has helped over 235,000 IT professionals reach further and higher in their careers. The 2009 Network+ exam (N10-004) is a major update with more focus on security and wireless aspects of networking. Our new study guide has been updated accordingly with focus on network, systems, and WAN security and complete coverage of today’s wireless networking standards. | 56 CHAPTER 2 Network Media Coaxial cable is also relatively easy to install. If you ve ever extended the cable for your cable TV you re probably familiar with some of the ease and difficulty you ll face. The connectors for coaxial cable are fairly simple to install but the cable is relatively thick and rigid and can require some finesse in navigating it around corners. Installation of fiber-optic cabling can be difficult which is why many companies outsource the job of installing and maintaining it to other firms such as a local phone company. Not only is it somewhat difficult to install but it is also difficult to test. Cable testers are your insurance that a line is operational so you do not have to come back to fix it or spend more time troubleshooting it immediately after installation. Because glass or plastic is used to carry the data connecting two pieces of cabling together can provide difficulties as they must be fused together. Because of the cost of fiber-optic cables it generally isn t installed throughout an entire network. Rather fiber is often used as a backbone for networks connecting different buildings together so that data can be transmitted quickly between them. Although other types of cabling are used within the buildings a local phone company or another firm that specializes in fiber-optic installation may be used to install and maintain the fiber-optic cabling. Troubleshooting Experienced network administrators know that cabling is one of the most common causes of network failure. For this reason you should check cabling early in the network troubleshooting process. Because you are often responding to a single workstation or group of computers that can t communicate with the network start at that point and then work outward. There is no point in checking the backbone of the network if a single computer is having a problem. Also because the workstation is probably using twisted-pair or 10Base2 coaxial cable it is also the easiest to check .

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