Application layer.
Gateway
A web browser is best associated with the application layer of the OSI Model.
DHCP runs at the application layer of the OSI model.
layer 1, or the physical layer
layer 3 , network layer .
Gateway network device
Gateways work on all seven OSI layers . The main job of a gateway is to convert protocols among communications networks.
It is sometimes recognized that a gateway may function across several or all layers of the OSI model.
Data link layer of the OSI model..
That is a loaded question...it depends on what you mean by gateway. I proxy server can be a gateway so can a router. Typically, its gateway=router. check this chart out: http://www.geocities.com/SiliconValley/Monitor/3131/ne/osimodel.html I consider it on the Network layer. Let me know if this helps! Thanks, Eric Elliston President of Elliston Consulting http://www.ellistonconsulting.com
it may be network layer or transport layer.. it depends on the design of the firewall.. also depends on the requirement specification..
OSI stands for Open system interconnection model. Application layer is the seventh layer in OSI model.