OSI Model - Network Device
Physical Layer= Hub, Repeater
Data Link Layer= Switch , Bridge, Modem
Network Layer= Router, firewall
Transport+ Session+ Presentation+ Application= Gateway
Network Devices--Data transfer in the form of :-
Gateway= Segment= Transport Layer
Router= Packets= Network Layer
Switch+ Bridge= Frame = Data Link Layer
Hub + Repeater= Bit= Physical Layer
Hub , Repeater= Star Topology
Bridge= Bus / Tree Topology
Switch= Star Topology
Router= Star Topology
Gateway= Star Topology
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