Although I haven't begun my studies for SCSA, I've earned my CCNA already. My opinion on your question though is this. You have already dipped yourself into Solaris, why not further your knowledge by going the network route for it? I would suggest doing the SCNA, and afterwards, then do your CCNA. That is, however, if you'd even still be interested in it. Keep in mind that the CCNA not only tests your networking knowledge, but it also tests you on how to configure, troubleshoot and maintain their routers and switches. Yeah, stick with what you know for now, and go for the SCNA.