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

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Local Area Network (LAN) 1
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Why Use a LAN ± Information sharing ² Having users access the same files, exchange information via email, or use Internet eso rce sharing ± Resource sharing ² Having hardware devices shared by all users rinters Internet connections ± Printers, Internet connections ² Having software packages shared by all users on a LAN esign requirements ± Design requirements ² Affordable ow complexity ² Low complexity ² Scalable Communication Networks © Kang Xi, Polytechnic Institute of NYU 2
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Key Aspects of LAN Design ignal transmission ± Signal transmission ± Network topology ± Medium Access Control ± Packet forwarding acket structure ± Packet structure Communication Networks © Kang Xi, Polytechnic Institute of NYU 3
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Signal Transmission ± Broadcast ± All stations communicate over a shared medium ± Transmission from any station is received y all other stations by all other stations ± Simple, but not scalable ± Switching formation is delivered only to the ² Information is delivered only to the destination Communication Networks © Kang Xi, Polytechnic Institute of NYU 4 ² Efficient, but requires sophisticated design
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LAN Topology ree ± Tree ± Bus ± Ring ± Star Communication Networks © Kang Xi, Polytechnic Institute of NYU 5
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IEEE 802 LAN Standard 802.2 TM Logical Link 0 TM Security 802.1 TM Bridging nagement & Architecture 802.1 Data Link Layer 802.3 Medium Access 802.4 Medium Access 802.5 Medium Access 802.11 Medium Access 802.12 Medium Access 802.15 Medium Access 802.16 Medium Access 802.17 Medium Access Ma 2 ® Overview 802.3 Physical 802.4 Physical 802.5 Physical 802.11 Physical 802.12 Physical 802.15 Physical 802.16 Physical 802.17 Physical 80 Physical Layer * Formerly IEEE Std 802.1A TM Communication Networks © Kang Xi, Polytechnic Institute of NYU 6
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LAN Protocol Architecture ± Physical Layer ² Encoding/decoding ² Preamble generation/removal ² Bit transmission/reception ² Transmission medium and topology ± Logical Link Control ² Interface to higher levels ² Flow and error control ± Media Access Control ² Assembly of data into frame with address and error detection fields ² Disassembly of frame ± Address recognition ± Error detection ² Govern access to transmission medium ± Not found in traditional layer 2 data link control ² For the same LLC, several MAC options may be vailable Communication Networks © Kang Xi, Polytechnic Institute of NYU 7 available
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LAN Protocols in Context Communication Networks © Kang Xi, Polytechnic Institute of NYU 8
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Ethernet Communication Networks © Kang Xi, Polytechnic Institute of NYU 9
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CSMA/CD Communication Networks © Kang Xi, Polytechnic Institute of NYU 10
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Ethernet ork started back in 1973 by Bob Metcalfe and David Boggs from ± Work started back in 1973 by Bob Metcalfe and David Boggs from Xerox Palo Alto Research Center (PARC).
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This note was uploaded on 11/02/2010 for the course EE 136 taught by Professor Kang xi during the Spring '10 term at NYU Poly.

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

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