JNCIA-Junos compared to CCNA.

Hi all,

I have passed my CCNA last year (on the 4th attempt) and about to start my studying for JNCIA.
My question: What are the main things that JNCIA has and CCNA does not? I kinda wanna cut this short, because I know loads of stuff like OSI, subnetting are also included in this exam, which I already know of.

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Thanks