TELNET
There is a good descrition of the network layer and TCP in the related link. NO. In general TCP and UDP are transport protocols that operates in Layer 4 Transport Layer
Tcp/ip
The network layer protocol is Trivial File Transfer Protocol (TFTP)
connectionless protocols - transport layer
A protocol is a set of rules describing some behavior. In order to communicate in a common manner, the sender and receiver have to agree on the "language" of communication. A protocol states what those rules are, and because they are a standard, everyone agrees and knows what to expect.
To be in a network and communicate we need to follow a set of rules and procedures . These set of rules and procedures are called protocols. So to exchange information these protocols should be followed.
transport layer
Routers and layer 3 switches work at Layer 3 of OSI model.
protocols used for network device.
Network protocols provide mechanisms that enables communications between sysytems, clients, servers, websites etc. without protocola systems would not be able to communicate, share data etc.
A network must use a common language or set of rules to be able to communicate with other networks. These rules are standardized by committee and are an agreed upon set of rules. These rules are known as protocols, and are widely published.
TCP and UDP are transport layer protocols; the OSI layer is layer 4 (transport)