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Network Switches
Background Information
 Growing local area network demands
Current demands are challenging Ethernet bandwidth
Demand growth will challenge Token Ring soon
 Switching accommodates growth
 Higher speeds with easy, cost effective migration
No need to replace existing LAN products
 Switching enables full duplex, doubling conventional bandwidth
 Switching provides a low cost, high performance solution
Why is Switching Important?
 Switches
Simpler functions
Optimized for LAN connections
Lower price per port
Better performance (lower latency)
 Bridges and Routers
More complex functions
Optimized for mixed LAN and WAN connections
Higher price per port
Lower performance (higher latency)
Switches, Bridges, and Routers
 Segment LANs for improved performance
 Dedicated or shared
 Full or Half Duplex
 Cut-Thru or Store-and-Forward
 Token Ring or Ethernet
LAN Switch Features
Shared
Dedicated
Typical Congested LAN
 4 Ethernet hubs
 8 Clients/hub
 2 Servers
 All share 10 Mbps bandwidth
Hub Hub Hub Hub
Add A Switch
Reduce Congestion
 No change to wiring
 Each hub segment gets 10
Mbps
 Servers at Full Duplex
Switch
Hub Hub Hub Hub
Total Switching
Maximum Bandwidth
 All stations on dedicated segments
 Up to 8x improvement over original
 High speed connections between
switches
Switch
Switch Switch
Switch
Switch
Section end

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NET4.PPT

  • 2.  Growing local area network demands Current demands are challenging Ethernet bandwidth Demand growth will challenge Token Ring soon  Switching accommodates growth  Higher speeds with easy, cost effective migration No need to replace existing LAN products  Switching enables full duplex, doubling conventional bandwidth  Switching provides a low cost, high performance solution Why is Switching Important?
  • 3.  Switches Simpler functions Optimized for LAN connections Lower price per port Better performance (lower latency)  Bridges and Routers More complex functions Optimized for mixed LAN and WAN connections Higher price per port Lower performance (higher latency) Switches, Bridges, and Routers
  • 4.  Segment LANs for improved performance  Dedicated or shared  Full or Half Duplex  Cut-Thru or Store-and-Forward  Token Ring or Ethernet LAN Switch Features Shared Dedicated
  • 5. Typical Congested LAN  4 Ethernet hubs  8 Clients/hub  2 Servers  All share 10 Mbps bandwidth Hub Hub Hub Hub
  • 6. Add A Switch Reduce Congestion  No change to wiring  Each hub segment gets 10 Mbps  Servers at Full Duplex Switch Hub Hub Hub Hub
  • 7. Total Switching Maximum Bandwidth  All stations on dedicated segments  Up to 8x improvement over original  High speed connections between switches Switch Switch Switch Switch Switch