Cisco Networking Academy Program CCNA 1 and 2 Companion Guide, Revised part 25 is the Cisco approved textbook to use alongside version of the Cisco Networking Academy Program CCNA 1 and CCNA 2 web-based courses. The topics covered provide you with the necessary knowledge to begin your preparation for the CCNA certification exam (640-801, or 640-821 and 640-811) and to enter the field of network administration. | Table 4-3 Comparing Ethernet Media Requirements Media Maximum Segment Length Topology Connector 10BASE2 50-ohm coaxial thinnet 185 m feet Bus British Naval Connector BNC 10BASE5 50-ohm coaxial thicknet 500 m feet Bus Attachment unit interface AUI 10BASE-T EIA TIA CAT 3 4 5 UTP two pair 100 m 328 feet Star ISO 8877 RJ-45 100BASE-TX EIA TIA CAT 5 UTP two pair 100 m 328 feet Star ISO 8877 RJ-45 100BASE-FX 125 multimode fiber 400 m feet Star Duplex media interface connector MIC straight tip ST connector or subscriber connector SC 1000BASE-CX STP 25 m 82 feet Star ISO 8877 RJ-45 1000BASE-T EIA TIA CAT 5 UTP four pair 100 m 328 feet Star ISO 8877 RJ-45 1000BASE-SX 50 micro multimode fiber 275 m 853 feet for micro fiber 550 m feet for 50 micro fiber Star SC 1000BASE-LX 50 micro multimode fiber 9-micron singlemode fiber 440 m feet for micro fiber 550 m feet for 50 micro fiber 3 to 10 km to miles on single-mode fiber Star SC Page 209 Tuesday May 27 2003 9 01 AM Page 210 Tuesday May 27 2003 9 01 AM 210 Chapter 4 Cable Testing and Cabling LANs and WANs Figure 4-20 Differentiating Among Connections Connection Media This section briefly discusses the connection types used by physical layer implementation and an interface device Gigabit Interface Converter GBIC used between the Ethernet and fiber-optic systems. This section covers the following topics RJ-45 A connector commonly used for finishing a twisted-pair cable AUI A connector that interfaces between a computer s NIC or router interface and an Ethernet cable GBIC A device used as an interface between the Ethernet and fiber-optic systems RJ-45 The RJ-45 connector and jack are the most prevalent. RJ-45 connectors are discussed in more detail in the section UTP Implementation later in the chapter. Attachment Unit Interface In some cases the type of connector on a NIC does not match the type of media that it needs to connect to. .
