Router to Router Setup, using Crossover or Standard?

Question

I have a network with DHCP from the WirelessRouter.

----<WirelessRouter/Router>----<-100meters->----<?ANOTHER ROUTER?>-----to other computers
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----Connected to other computers

For the 100 meters, I use copper wire. Do I need to use a crossover setup for RJ45? Or can I just use the standard setup of RJ45?

Here in my house, I already set up the 100 meters with a standard setup, in which if we remove the <?ANOTHER ROUTER?>, the 100 meters will connect directly to one computer only.

I want to add some routers there, but my instructor said that a standard setup of RJ45 will not work for router-to-router here.

Maybe I missed something above, I forgot what a crossover setup or a standard setup is. I assume that crossover is for router-to-router or a computer-to-computer connection. Correct me if I'm wrong.

Answer 1

Just remember simple rule:

when the devices are same, then crossover cable is used.

when devices are different, Straight cable is used.

so for router-to-router we need crossover cable.

Answer 2

This is special thing which is against standard rule to connect router to router we should use straight through cable let me elder to get the answer why this is use but its confirmed straight through is used