switch
1 connects lan segments
2 reduce the number of collision domais
3 increase the number of collision domains
Hub
1 the speed works is the same
2 has no storage
3 concentraste all workstation.
Router
1 recieives and foward internet detagrams
2 interfaces poket networks
3 conforts internet protocols
low mantainance cost
spring into flowering cherry
electros devices used in computer systems
all of them produces internet.