08-LL-HubsBridgesSwitches

08-LL-HubsBridgesSwitches - 1 I nterconnecting LAN segments...

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Unformatted text preview: 1 I nterconnecting LAN segments Repeaters Hubs Bridges Switches 2 I nterconnecting with repeaters Repeaters used to connect multiple LAN segments A repeater repeats bits it hears on one interface to its other interfaces: physical layer device only! Ethernet: Max 4 repeaters per LAN Total 5 LAN segments 5*30 = 150 nodes max. Repeaters have become a legacy technology Repeater LAN segment 1 LAN segment 2 3 I nterconnecting with hubs Effectively a physical layer device Multi-port repeater Operates at bit level Repeat received bits on one interface to all other interfaces 4 I nterconnecting with hubs Hubs can be arranged in a hierarchy (or multi-tier design), with backbone hub at its top Better than repeaters Hubs can detect malfunctioning node adapters and disconnect them from the network thereby increasing reliability Can collect statistics such as collision rate, network usage, average frame size Provide network management functionality 5 Advantages of hubs Easy to Understand Easy to I mplement so theyre cheap 6 Limitation of hubs Cant interconnect 10BaseT & 100BaseT I ndividual segment collision domains become one large collision domain if a node in CS and a node EE transmit at same time: collision Poor security Why should host B get to share its link with a conversation between A and D?...
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08-LL-HubsBridgesSwitches - 1 I nterconnecting LAN segments...

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