Hi everyone I am preparing for the ccna certification. For my labs I'm using "cisco packet tracer" I've come to the router chapter. When running my first command "show int serial 0/0/0 or 1" and all other serial interfaces, it doesn't work. From what I have been able to understand so far that in order for it to work with serial interfaces, I have to enable them. The problem is that the "HWIC-4ESW module" is missing at least this should be for serial interfaces.
My questions are:
1) Is HWIC-4ESW module the right module?
2) What are the modules? Ie in reality are the physical cards to be installed in the nim slots? Or are they software modules that are installed in routers anyway?
3) Where can I find these modules for cisco packet tracer? Is there also a guide?
