tailieunhanh - CompTIA Network+ Certification Study Guide part 9

CompTIA’s Network+ certification Study Guide part 9 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. | 66 CHAPTER 2 Network Media Table Four-Pair Cable Color Code Pair Solid Wire Striped Wire 1 Blue Blue and white 2 Orange Orange and white 3 Green Green and white 4 Brown Brown and white Twisted-Pair Wire Pin Placement Table Pin Wire 1 Orange and white 2 Orange 3 Green and white 4 Blue 5 Blue and white 6 Green 7 Brown and white 8 Brown When connecting twisted-pair wire to an RJ-45 connector the wires will have to be aligned so that they match up with the pins of the connector. Table shows how the various wires of a four pair cable are installed. Cable Installation When installing cable you first need to choose the location of the hub switch or router. These devices will be where the cable will attach to and as we ll see in the next chapter are used to move data from one cable to another so it reaches its intended destination. In larger organizations a patch panel or cabinet may be used to accommodate numerous cables or a separate hub switch or router will be used for each floor of a building. Using one of these devices on each floor will save time and require less cable. Once the location of network devices has been decided you should create documentation on where the cables will be installed. A map of wiring should include how many cables will be installed in ceilings walls and other locations. While creating the map you will also be able to review issues that will arise during the actual cabling such as holes that may have to be drilled Cable Management 67 or vertical runs of cabling down elevator shafts. When determining how the cable should run from an outlet to a hub switch or router you should remember to keep the cabling at least three feet away from fluorescent lights and other sources of EMI. Cables should be tested before they re actually installed. Even if new cable is being used for the installation this doesn t guarantee that it isn t damaged in some way. It is easier to test the cable before installation than to determine where a section of