I noticed the Cisco Academy uses Cisco Packet Tracer and yet it does not support the show ipv6 routers that you demonstrated in one of the topics. Are we expected to know this for CCNA?
Although nothing is explicitly mentioned about the specific command for CCNA, it’s a good idea to know it and understand what it does and what information it presents you with. I have checked and confirmed that the command is unavailable in Packet Tracer v7.
If you look at and understand the Rene’s lesson, even if you cannot implement it yourself on Packet tracer, you should be OK for the exam.
I hope this has been helpful!