What is a likely cause of the problem is that Sue finds that she is unable to access the Internet, opens a command line prompt and enters ipconfig, and determines that her IP address is 169.254.17.200, which is not on her network?

When she turned on her computer, it should attempt to access the DHCP server to obtain an IP address. If the DHCP server is unavailable, her system will issue itself an APIPA address in the range 169.254.0.1 through 169.254.255.254, followed by a broadcast to guarantee no other PC is presently using that address. Unfortunately, the IP 169.254.17.200 chosen at random by her system is not on her network, therefore she will not be able to communicate.