LAYER 3 REFERS TO THE NETWORK LAYER in the Open Systems Interconnection (OSI) Reference Model. The Network Layer is the core layer of a network engineer’s duties and responsibilities. Although it is important to understand the relationship between Layer 3 and the other layers, the vast majority of network protocols, functions, and tasks reside at this layer. This chapter will cover these different protocols and how they are used to interact with each other to establish communications over the network. This chapter also will provide an overview of Layer 3 networking and how it works, ...
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