Where is the command to load ethernet network module placed?

[J . H . Kim]

Hi, everyone

I wonder where the ethernet network module is loaded.
Is it loaded in the kernel source code statically or  in the  init script?

I  think the network  module  is loaded after init user process is created,
but I don't know where the loading point is.

Please tell me where the command to load the network module is placed.

Thanks in advance.

J.H.Kim