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An overview of switches, their role in networking, and their functionality. Topics covered include forwarding frames, self-learning, filtering and forwarding, traffic isolation, and dedicated access. Switches are link layer devices that store and forward ethernet frames, examining frame headers and forwarding frames based on mac addresses. They are transparent, plug-and-play, and self-learning devices.
Typology: Slides
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Link layer device stores and forwards Ethernet frames examines frame header and selectively forwards frame based on MAC dest address when frame is to be forwarded on segment, uses CSMA/CD to access segment transparent hosts are unaware of presence of switches plug-and-play, self-learning switches do not need to be configured
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hub (^) hub hub
switch 1 2 3
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When switch receives a frame:
index switch table using MAC dest address if entry found for destination then{ if dest on segment from which frame arrived then drop the frame else forward the frame on interface indicated } else flood
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switch installation breaks subnet into LAN segments switch filters packets: same-LAN-segment frames not usually forwarded onto other LAN segments segments become separate collision domains
hub (^) hub hub
switch
collision domain (^) collision domain
collision domain
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cut-through switching: frame forwarded
from input to output port without first collecting entire frame slight reduction in latency
combinations of shared/dedicated,
10/100/1000 Mbps interfaces
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hub (^) hub hub
switch
to external network router
IP subnet
mail server
web server
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Introduction and services
Error detection and correction
Multiple access protocols
Link-Layer Addressing
Ethernet
Hubs and switches PPP MPLS
