Routers, hubs and switches

Routers
  • Device which forwards data packets between computer networks (OSI Layer 3)
  • Reads the address information and determines its ultimate destination
  • Contains routing table with all the information about the addresses of connected networks
Hubs
  • Device for connecting multiple Ethernet devices together and making them act as a single network segment
  • Includes multiple I/O ports, in which a signal introduced at the input of any port appears at the output of every port except the original incoming
  • Works at physical layer (layer 1) of the OSI model
Switches
  • Device that is used to connect devices together on a computer network by performing a form of packet switching (Layer 2)
  • A switch will only send a message to a device that needs or requests it, rather than broadcasting the same message out of each of its ports