LAN - Local Area Network Network (LAN) 1 Overview Overview...

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Local Area etwork (LAN) 1 Network (LAN)
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verview EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 2 Overview
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Why Use a LAN s Information sharing b Having users access the same files, exchange information via email, or use Internet s Ex: single purchase order database accessed by all users on the LAN EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 3 b Results in improved decision making s Resource sharing b Having hardware devices shared by all users s Printers, Internet connections b Having software packages shared by all users on a LAN b Results in reduced cost s Question: Why not apply WAN technology (such as SONET) to LAN?
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Introduction EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 4
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Broadcast Networks s Recall that in broadcast networks: s Each station is attached to a transmitter/receiver which communicates ver a medium shared by other stations EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 5 over a medium shared by other stations s Transmission from any station is received by all other stations s There are no intermediate switching nodes
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Local Area Network (LAN) s Almost all LANs use a multiple access channel s The interesting part of LANs is the igher EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 6 protocol that control the access to the channel (Medium Access Control or MAC) s MAC protocols are implemented as a sublayer of the Data Link Layer (MAC Layer) Physical Layer Data Link Layer Higher Layer Medium Access Control
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LAN Topology s Tree s Bus ing EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 7 s Ring s Star
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Bus and Tree s Multipoint medium s Transmission propagates throughout medium s Heard by all stations b Need to identify target station EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 8 s Each station has unique address s Need to regulate transmission b To avoid collisions b To avoid hogging s Data in small blocks - frames s Terminator absorbs frames at end of medium
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Ring Topology s Repeaters joined by point to point links in closed loop b Receive data on one link and retransmit on another b Directed links tations attached to repeaters EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 9 b Stations attached to repeaters s Data in frames b Circulate past all stations b Destination recognizes address and copies frame b Frame circulates back to source where it is removed s Media access control determines when station can insert frame
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Star Topology s All stations connected directly to a central node sually via two point oint links EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 10 b Usually via two point-to-point links s Central node can broadcast b Physical star, logical bus b Only one station can transmit at a time s Central node can act as frame switch
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LAN - Local Area Network Network (LAN) 1 Overview Overview...

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