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Connecting LANs, Backbone Networks, and Virtual LANs 01204325: Data Communication and Computer...
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Transcript of Connecting LANs, Backbone Networks, and Virtual LANs 01204325: Data Communication and Computer...
Connecting LANs, Backbone Networks, and
Virtual LANs
01204325: Data Communication and Computer Networks
Asst. Prof. Chaiporn Jaikaeo, [email protected]
http://www.cpe.ku.ac.th/~cpjComputer Engineering Department
Kasetsart University, Bangkok, ThailandAdapted from lecture slides by Behrouz A. Forouzan© The McGraw-Hill Companies, Inc. All rights reserved
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Outline Network connecting devices Backbone networks Virtual LANs
3
Network Connecting Devices
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Layer-1 Connecting Devices
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Repeaters Connected segments become single
collision domain
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Repeater Function
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Hubs Similar to multiport repeaters All segments belong to the same
collision domain
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Layer-2 Connecting Devices
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Bridges Bridges process information up to the
frame-level (layer 2)
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Bridges Connecting LANs while separating collision
domains MAC addresses are used for filtering Connected segments form a single network
(same broadcast domain)
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Learning Bridges
A D
E A
B C
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Loop Problem
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Graph Representation
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Creating Spanning Tree
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Blocking Ports
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Switches Similar to multiport bridges Also run Spanning-Tree Protocol
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Layer-3 Connecting Devices
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Routers Capable of connecting networks of
different types Routers separate networks into
different broadcast domains
Backbone Networks
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Bus Backbone
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Star Backbone
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Connecting Remote LANs
Virtual LANs
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Regular Switch Three LANs are connected by a regular
switch, forming one LAN (one broadcast domain)
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Switch with VLAN Feature Different VLANs belong to different broadcast
domains They are considered isolated networks
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Multiple VLAN Switches
Trunk Trunk
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Routing Across VLANs Router is required to connect
different VLANs
Trunk Trunk
Trunk