Sams Teach Yourself TCP/IP in 24 Hours (4th Edition)

A computer that is acting as a file server is running and is connected to the network, but the users can't access files. What could be wrong?

Any number of things could be wrong, and a closer look at the particular operating system and configuration will yield a more detailed analysis. For purposes of understanding this hour, the first step is to check to see whether the computer's file server service is running. A file server is not just a computer; it is a service running on that computer that fulfills file requests.

Why does IPX tunneling use the UDP Transport protocol rather than the more reliable TCP protocol?

IPX essentially grafts the IPX/SPX stack onto TCP/IP. IPX/SPX has its own error control and flow control features, so the error control and flow control provided by TCP aren't necessary.