Got my CCNA, what now: SND or SNRS

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Hello,

About one year ago I did the CCNA exam and passed it.

Now I want to do some follow up on that but don't know which one. I'm very interested in taking a exam from the CCSP.

I want to take the SND or the SNRS exam. What do you recommend to take first and what are the main differences?

Also what are good study books for both exams? Because I can't find any for the SND.

And what about the NSA thing that comes with the SND:

Looking forward on your comments.

Thanks.