Network Layer – Building on IP
The purpose of the network layer is to help route messages between different local networks. Central to this layer is the concept of exclusive network addresses, where every terminal connected to the network has its own uniquely assigned address. One of the most common protocols in this layer is the Internet protocol (IP), used worldwide throughout the Internet. Every node connected to the Internet must have a different IP address, which can be allocated on a permanent basis, or on a per-session basis, that is, for the duration of a telephone call to an ISP. This chapter is not a treatise on IP, it only covers those aspects most relevant to embedded systems designs and applications. More information can ...
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