A.processor B.device C.route D.terminal
A.ports B.streams C.packets D.cells
A.user B.host C.city D.destination
A.packet B.time C.error D.phase
A.connectionless B.connection-oriented C.datagram D.telegram
A.routers B.stations C.servers D.switches
A.tap B.repeat C.terminator D.concentrator
A.tree B.bus C.star D.ring
A.numbers B.connection C.diagrams D.resources
A.source B.route C.destination D.host
