As someone who has both they are literally the same shyt, just CCNA has a little more Cisco specific stuff but its even been a while since I've come across a different device, its all palo alto and f5.
The knowledge is foundational because you come across it all the time without really realising, for example I did a firewall review the other day, we have a jr sec guy who apparently already looked over it months ago, turns out the config was useless because the first rule was allow all traffic
I noticed because I was seeing traffic between two subnets that shouldnt really be communicating so its shyt like that.
In terms of OSI layer you will get the knowledge from both but again its putting into practice you really understand how shyt works
Also for cyber security, the reason shyt is all over the place is because its a booming field and companies dont really know what they want
I've been on interviews where they ask for
IT security analyst and half way through I'm thinking yall want an
Information Security Analyst instead
Very different roles, different payscales but there is some overlap
The issue is job titles, the same job title can be used for someone making 20k and someone making 200k but when you get down to the details, its quite different its just most HR have no clue
There was a time I was offered a role and i told em look im not taking less than £70k they were like but the market rate is 50k
I basically told em they had no idea how much they were asking for in terms of the role responsibilites
Generally speaking unless you go down like a pentest route, the more hands off you are, the more money you are making.