Interconnection Devices
Repeater: PHY device that restores data and collision signals
Hub: Multiport repeater + fault detection and recovery
Bridge: Datalink layer device connecting two or more collision domains. MAC multicasts are propagated throughout “extended LAN.”
Router: Network layer device. IP, IPX, AppleTalk. Does not propagate MAC multicasts.
Switch: Multiport bridge with parallel paths
These are functions. Packaging varies.