I'm a slacker when it comes to certs, but a I'm getting the feeling having at least a CCNA (R/S) at my workplace is going to become a hard requirement in about three months, so I thought I'd get ahead of the curve and start working on it now. My goal has always been to expand that to the CCNP (R/S) as well.
Currently, I'm re-reading the Odom book and doing a few sub-netting drills on
Subnetting Practice Questions. It's taking me about 15 seconds per question, on average. I can do the calculations in my head, but I'll probably write out a table on the dry-erase board so I don't make stupid mistakes.
I work with Cisco devices at work and I have a lot of hands-on with their gear, which may help.
My main worry is IPv6, which I have no practical experience with, so I plan on hitting that really hard. I'd also like to do a big refresher on EIGRP, since we're running OSPF at work (and on my home network). At home, I have two 3560s, two 2960s, three 1841s, and a couple other routers from vendors capable of running actual interior routing protocols (Ubiquiti, for example). Finally, I just installed Cisco VIRL (as a virtual appliance on ESXi) at home, so hopefully I can supplement with that!
Any suggestions anyone has at this point would be greatly appreciated.