Crossover cables can support direct communication between two computers without the need for an intermediate device. Keep in mind this just refers to the cable, the computers still need to be correctly configured for this to work. Many modern Network Interface Cards (NICs) can support automatic cable type detection allowing a Crossover and Straight-through cable to work. A Rollover cable is used to connect a computer to network devices for configuration purposes only and is sometimes called a console cable. RJ-11 and RJ-45 are connector types not cable types.
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What is a crossover cable and how does it work?
What does RJ-45 mean and how is it related to Ethernet cables?
What types of devices require a rollover or console cable?