4 The TCP/IP networking model
This chapter covers
- What networking models are and why we need them
- The OSI model
- The TCP/IP model and its layers
- How each layer plays a role in moving data across a network
- Data encapsulation and de-encapsulation
In the previous chapter, we looked at Ethernet; specifically, we looked at the types of physical connections defined by the Ethernet standard. Ethernet also defines rules for how devices can communicate over those connections. However, Ethernet alone isn’t sufficient for two computers to communicate over a network (e.g., for a PC to retrieve a web page from a server over the internet). Communicating over a network is a complex process, and it requires a variety of protocols, each of which performs specific ...
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