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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, which is not on her network?

A She is unable to connect to the DHCP Server.

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 through, followed by a broadcast to guarantee no other PC is presently using that address. Unfortunately, the IP chosen at random by her system is not on her network, therefore she will not be able to communicate.