Layer 2 , Data Link Layer
Switches / Bridges and hubs work at data link layer, but there are layer three switches which operate at network layer. Dhruv
1. Repeaters (Operate at the OSI Physical Layer).2. Bridges (Operate at the OSI Data Link Layer).3. Routers {and Brouters} (Operate at the OSI Network Layer).
hub work at physical layer of osi model
2
Layer 1 - the physical layer
layer 3 layer 3 Switch/ Bridges / Hubs works at layer 2 as they utilizes MAC address to communicate. However i aggree above stated answer as there are some layer three switches that work at Layer3 i.e. Network Layer. Dhruv
physical layer Layer 1
Layer 4 : The Transport Layer
Layer 7: The Application Layer
Data Link Layer
PGP works at the Layer 6 - Presentation level.
TheHub work on layer 1 i.e. Physical layer of OSI Model