LAN - Local Area Network (LAN) 1 Why Use a LAN Information...

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1 Local Area Network (LAN)
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 2 Why Use a LAN Information sharing Having users access the same files, exchange information via email, or use Internet Resource sharing Having hardware devices shared by all users Printers, Internet connections Having software packages shared by all users on a LAN Design requirements Affordable Low complexity Scalable
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Key Aspects of LAN Design Signal transmission Network topology Medium Access Control Packet forwarding Packet structure Communication Networks © Kang Xi, Polytechnic Institute of NYU 3
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 4 Signal Transmission Broadcast All stations communicate over a shared medium Transmission from any station is received by all other stations Simple, but not scalable Switching Information is delivered only to the destination Efficient, but requires sophisticated design
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 5 LAN Topology Tree Bus Ring Star
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 6 IEEE 802 LAN Standard 802.2 TM Logical Link 802.1 TM Bridging 802.3 Medium Access 802.3 Physical 802.4 Medium Access 802.4 Physical 802.5 Medium Access 802.5 Physical 802.11 Medium Access 802.11 Physical 802.12 Medium Access 802.12 Physical 802.15 Medium Access 802.15 Physical 802.16 Medium Access 802.16 Physical 802.17 Medium Access 802.17 Physical 802.1 TM Management 802 ® 802.10 Security Data Link Layer Physical Layer * Formerly IEEE Std 802.1A TM
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 7 LAN Protocol Architecture Physical Layer Encoding/decoding Preamble generation/removal Bit transmission/reception Transmission medium and topology Logical Link Control Interface to higher levels Flow and error control Medium Access Control Assembly of data into frame with address and error detection fields Disassembly of frame Address recognition Error detection Govern access to transmission medium Not found in traditional layer 2 data link control For the same LLC, several MAC options may be available Physical Layer Logical Link Layer Higher Layer Medium Access Control
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 8 LAN Protocols in Context
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 9 Ethernet
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 10 CSMA/CD
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This note was uploaded on 04/06/2011 for the course EE 5363 taught by Professor Kang during the Spring '09 term at NYU Poly.

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LAN - Local Area Network (LAN) 1 Why Use a LAN Information...

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