Direct Links

We consider the problems of reliably transferring data between two computers over a direct link, which might be copper, fiber, or wireless. Problems to be addressed include: encoding bits onto the medium; grouping bits into frames and ensuring frames are received correctly and reliably; flow control; and managing contention on multiaccess links such as Ethernet and Wi-Fi. We also explore the unique challenges of wireless communications, including Wi-Fi, cellular, and Bluetooth, such as the efficient use of spectrum and various forms of interference. Finally, we look at the increasing importance of edge networking as an area of great investment and innovation.