Internetworking

Internetworking - EE450, USC, Zahid 1 Internetworking...

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Unformatted text preview: EE450, USC, Zahid 1 Internetworking Devices EE450: Introduction to Computer Networks Professor A. Zahid EE450, USC, Zahid 2 Classifications of Internetworking Devices EE450, USC, Zahid 3 Repeaters z Repeaters are physical layer devices z Single collision and broadcast domain EE450, USC, Zahid 4 Functions of a Repeater EE450, USC, Zahid 5 Hubs Physical-layer (dumb) repeaters: z Bits coming in one link go out all other links at same rate z All nodes connected to hub can collide with another one. No isolation of collision domains z No frame buffering z No CSMA/CD at hub z Host NICs detect collisions z No isolation of broadcast domain twisted pair hub EE450, USC, Zahid 6 Hub Hierarchy EE450, USC, Zahid 7 Bridges z Bridges are MAC/Link layer devices operating on Ethernet frames, examining frame header and selectively forwarding frame based on its destination z Bridge isolates collision domains since it buffers frames z When frame is to be forwarded on segment, bridge uses CSMA/CD to access segment and transmit EE450, USC, Zahid 8 Bridges LAN w/Multiple Segments EE450, USC, Zahid 9 Pros and Cons of Bridges z Bridge advantages: z Isolates collision domains resulting in higher total maximum throughput, and does not limit the number of nodes nor geographical coverage z Can connect different type Ethernet since it is a store and forward device z Transparent: no need for any change to hosts LAN adapters. Hosts do not communicate with bridges z Disadvantage: Single broadcast domain! EE450, USC, Zahid 10...
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Internetworking - EE450, USC, Zahid 1 Internetworking...

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