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The primary job of the Internet Protocol (IP) is to deliver data between devices over an internetwork. On its journey between two hosts in an internetwork, this data may travel across many physical networks. To help ensure that the data is sent and received properly, it is encapsulated within a message called an IP datagram. This datagram includes several fields that help manage the operation of IP and ensure that data gets where it needs to go.

In this chapter, I take a look at how IP takes data passed to it from higher layers and packages it for transmission. I begin with a general ...

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