For CCNA I always recommended free Packet tracer software simulator from Cisco Academy before moving onto the real gear; PT is very simple and flexible software written to simulate IOS behavior; it has all you need to pass CCNA exam despite the fact that it is just a simulator. Exam focus on networking fundamentals and knowledge of commands (CLI) but not testing you on deep stuff or on real IOS behavior that would require real gear. Using PT properly you can learn networking fundamentals very well and that will help you later when going for advanced certifications.
you should start you journey at CLN, https://learningnetwork.cisco.com/s/ccna
you can find CCNA exam info, PT and gear topics, and others. You can get PT for free (just start their lab 1) from Net academy via https://www.netacad.com/courses/packet-tracer
Best of Luck!
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