Your CCNA will look good for an entry level job, but if the big money is what you want, you'll definitely want to get into bare minimum some CCNP stuff (Advanced Routing and Switching, and TONS of specializations), and the real dollars are CCIE's. If you're serious about it, I'd recommend getting on EBAY and buying a CCIE kit, which is usually several routers (2500's and 2600's) several switches (layer 2 and 3 switches), some kind of frame-relay simulator (adtran, etc) and possibly some modems and misc equip. It will be well worth your money and you'll be able to probably sell it for what you paid for it. I personally know CCIE consultants making $350K+ /year. If you're good at what you do, you can make good money.
I'm done with my CCNA and taking the exam this September. The best software simulator you can have without buying equipment is Network Visualizer 4.0
CCNA1-deals mostly with the fundamental issue, network terminology and protocols, LANS,WANS, OSI/TCP model, network standard.
CCNA2-is really fun, this is when you get to configure the routers, learn about its IOS, routing protocol (Distance Vector),TCP/IP and access list.
CCNA3-slightly longer, most people think it's the hardest part. There is more configuration on the router and switches. IP addressing techique like VLSM, implementing routing protocol (RIPv2,OSPF,IGRP,EIGRP),VLAN,trunking,
A general description of what a CISCO engineer does is simple. An Engineer solves problems! Cisco is the worlds leader in IT network services and products. So you solve problems with networks that are using their equiptment. Dont stop at CCNA go to at least CCNP and remember there are several areas to get that certification in. Here is a direct link to a table that shows the CISCO certifications field areas "http://www.cisco.com/web/learning/le3/learning_career_certifications_and_learning_paths_home.html" Enjoy! Go for the CCIE!!!!!!!!