Chapter 2. Internet “Sessions”

Imagine yourself talking on your mobile phone while driving to the office. On the drive to the office, your mobile phone is connected to a number of different cell towers, and the network somehow has to make sure that the “communication session” ends up at the mobile phone regardless of its location. Apart from the fact that phoning while driving is probably not a good idea from a safety point of view, you have perhaps always taken for granted that you could keep talking without losing your connection to the person on the other end of the line. In reality it is, because of the way the Internet works, hard to enable this kind of seamless, real-time mobility. The problem becomes even harder when sessions need to ...

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