Without the use of a router, which kind of Ethernet cable can be used for connecting two PCs?

Without the use of an intermediary device, crossover cables can provide a direct connection between two computers. Keep in mind that this only refers to the cable; for this to function, the computers must be set appropriately. Many current Network Interface Cards (NICs) can recognize the cable type automatically, allowing both a Crossover and a Straight-through connection to function. A rollover cable, also known as a console cable, is used to connect a computer to network devices for setup reasons only. The terms RJ-11 and RJ-45 refer to connection types rather than cable kinds.