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FAST & GIGABIT ETHERNET

FAST & GIGABIT ETHERNET. Fast Ethernet: Goals. Upgrade the data rate up to 100 Mbps Make it compatible with Standard Ethernet Keep the same 48-bit address Keep the same frame format Keep the same minimum and maximum frame lengths. New features. Auto-negotiation:

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FAST & GIGABIT ETHERNET

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  1. FAST&GIGABIT ETHERNET Network Security

  2. Fast Ethernet: Goals • Upgrade the data rate up to 100 Mbps • Make it compatible with Standard Ethernet • Keep the same 48-bit address • Keep the same frame format • Keep the same minimum and maximum frame lengths Network Security

  3. New features • Auto-negotiation: • It allows a station or a hub a range of capabilities. • Allows two devices to negotiate the mode or data rate of operation • Allows incompatible devices to connect to one another Network Security

  4. Topology used • Fast Ethernet is designed to connect two or more stations together either in a point-to-point or star topology (with a hub or switch in center) Network Security

  5. Implementations • It can be categorized as either two-wire or four-wire • Two-wire: cat 5 UTP (100Base-TX) or fiber-optic cable (100Base-FX) • Four-wire: cat 3 UTP (100Base-T4) Network Security

  6. Gigabit Ethernet: Goals • Upgrades the data rate to 1 Gbps • Make it compatible with Standard or Fast Ethernet • Use the same 48-bit address • Keep the same frame format • Keep the same minimum and maximum frame lengths • To support auto-negotiation Network Security

  7. Modes • Implements half-duplex and full-duplex • Full-duplex: • A central switch connected to all computers • Each switch has buffers for each input port • No collision i.e. CSMA/CD is not used • Maximum length of cable is determined by signal attenuation and not by collision detection process Network Security

  8. Modes (continued) • Half-duplex: • Rarely used, uses a hub instead of switch • Uses CSMA/CD • Frame Bursting Method is defined to determine maximum length of network • Multiple frames are sent. • Padding is added in between these frames to look like one frame, so that the channel is not idle. Network Security

  9. Topology used • Point-to-point • Star • Two star • Hierarchy of stars Network Security

  10. Implementations • Two-wire: • Fiber-optic cable (1000Base-SX, short-wave or 1000Base-LX, long-wave) or STP (1000Base-CX) • Four-wire: • 5 twisted-pair cable (100Base-T) Network Security

  11. Things to do • Encoding schemes of Fast & Gigabit Ethernet • Switched Vs Fast Vs Gigabit Ethernet • What is Ten-Gigabit Ethernet? • Wireless Ethernet & its frame format • Learn Broadband & Bluetooth architectures Network Security

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