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Published byJames Cooper Modified over 9 years ago
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Network Security FAST & GIGABIT ETHERNET
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Network Security 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
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Network Security 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
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Network Security 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)
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Network Security 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)
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Network Security 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
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Network Security 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
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Network Security 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.
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Network Security Topology used Point-to-point Star Two star Hierarchy of stars
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Network Security 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)
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Network Security 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
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