I passed this on Friday

As for study materials.. I used GNS3 as much as I could. worked well for the IPv6 lab. I bought the boson test to practice on. I do a lot of R/S trouble shooting at work, So this probably helped.
Advice. Take this exam 1 or 2 weeks after you passed the switch/route. It's pretty straight forward.
Not sure what to do next, may start heading CCIE direction. As i think it covers some of the gaps.. qos, security etc.
But it will be nice to have another pro cert, and DP seems the closest with only DA and Arch to sort out. So it may be a logical choice