Repeater is active only at the physical layer. Gateway is active in all of the layers.
Do not isolate collision domains: node may collide
When a bit comes into a hub interface, the hub New switches also combine router functionality.
Examples: Hubs vs. Switches
z Hub:
sends a frame from A to all ports –all stations.
z Switch:
uses destination address to route the frame to the port
connected to the destination station.
theoretically no collision.
Continuous table rewriting