Which? Where are the Options?
WAN Technologies operate & involve Layer1, Layer2 & Layer3 of OSI Model. Example of WAN Technology Protocols are Frame Relay, ATM & X.25 protocols.
The NIC operates on Layer 2 (Data Link Layer) of the OSI Model.
Network layer
generally layer 4, but SOCKS operates at layer 5, which allows it to work well with applications
TCP operates at Layer 4 which is Transport of the OSI Model!
FTP operates in application layer of ISO OSI layered model.
Router works in Network Layer of OSI model
If you mean the MAC address, that's a layer-2 concept.
IP operates at layer 3, this is the NETWORK LAYER in the OSI Model. Network+ Guide to Networks Fifth Edition Ch02, pg56, Figure 2-7
Routers and layer 3 switches work at Layer 3 of OSI model.
It operates on the data link layer of the OSI model (level 2). The switch creates a separate collision domain for each port. Although some switches operate on level 3 of the model and are called multi-layer switches.
OSI stands for Open system interconnection model. Application layer is the seventh layer in OSI model.
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