There are actually more than two protocols associated with Layer 4. According to Wikipedia, there are Transmission Control Protocol (TCP), User Datagram Protocol (UDP), Stream Control Transport Protocol (SCTP), Datagram Congestion Control Protocol (DCCP), and Internetwork Packet Exchange/Sequenced Packet Exchange (IPX/SPX).
There are more than two protocols at layer 4 for data transport; there is SPX and also TCP and UDP. These are the most common, and there are othres.
TCP and UDP
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.