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False.
A web browser is best associated with the application layer of the OSI Model.
Layer 5 - Session layer
No, At each layer, protocols perform servers unique to that layer. While performing those services, the protocols also interact with protocols in the layers directly above and below. In addition, at the top of the OSI model, Application layer protocols interact with the software you use. At the bottom, Phsyical layer services act on the networking cables and connectors to issue and receive signals.
Network Layer
application
Go to the Wiki for OSI model -that discussion and listing is very good.
Application Presentation Session
Layer 3 of the OSI model. An ICMP header follows the IP header of the IP packet.
OSPF and RIP are used in the network layer of the ISO model.
DHCP runs at the application layer of the OSI model.
Routers and layer 3 switches work at Layer 3 of OSI model.