firewall, router,layer 3 switches and i approve that answer !
NO! In general the firewall is a layer 4 device, it traffics filter incoming and outgoing ports. It uses the function of TCP and UCP. However a Firewall can also be a layer 3 device as in internal firewall in a router. Also a switch is a layer 2 device unless your talking about a Router switch.
Network Card (NIC)
PGP works at the Layer 6 - Presentation level.
No. Only protocols that users can see on their screen are considered Presentation Layer based. Hubs and repeaters operate on the physical layer, because it doesn't do anything with the data, it simply forwards it.
presentation layer
presentation layer is used
Not really; that is why you have the separate Presentation Layer, because of its responsibilities.
Presentation Layer.
Layer 6 - Presentation Layer
Presentation
It's called Presentation layer.
The Application layer The Presentation layer The Session layer
phonology andphnotics
presentation layer