Today the networking world is really changing. There are all kinds of disruptive technology coming up like SDN and cloud that are changing the way networking has been done for the last couple of decades completely.
However, Cisco's been at the top of the networking game for many, many years. Not only the hardcore foundational routing and switching, but at all the diverse and deep technologies like data center and collaboration. 80% of the world's networks and the internet are running Cisco gear.
It's always good to be learning from an industry leader, and Cisco's not going anywhere.
There are some good networking certs out there, some vendor neutral ones too - but the CCNA has also, like Cisco, been at the top of it's game (IT certification) for a long, long time. Even if you don't end up using cisco gear, by becoming a CCNA you will have built a SOLID foundation of networking concepts from the ground up.
The CCNA makes you a solid, well-rounded network engineer. Completing the certification process not only gives you a certificate, it trains you in multiple levels and areas regarding the ability to work with routed and switched networks.