From what book on Cisco to begin?

Question

IT education

Which Cisco book to choose to study first. Purpose: to understand the network as itself.

Answer 1

Google the official CCNA preparation guide.
Dry, formally, academically, but if you master it, you will know the Essence.

Answer 2

Start networks for the smallest on Habré. It's kind of theory-essence. And a specific vendor (and why not juniper or the same Mikrotik) - this can be the next step.