EIGRP is an important topic on the CCNA exam. Just as important as RIP is for the CCENT exam. Currently I’m studying for my CCNP ROUTE exam and reading about the EIGRP routing protocol. While there are some new topics about it that I didn’t learn when preparing for my CCNA exam, everything that I’m learning about requires foundational knowledge that I gained for my CCNA Exam. I guess what I’m trying to get to is that you shouldn’t put to light the topics you are learning about for the CCNA Exam and think that you won’t need to know much about them afterwards. Your knowledge of the basics will be critical as you start to learn about more advanced features of EIGRP.
Here is a list of the core topics about EIGRP:
EIGRP is a proprietary routing protocol created by Cisco. It is an advanced distance vector routing protocol. It will support load balancing across links of different speeds. Instead of using broadcasts to communicate is uses multicast and unicast. EIGRP uses autonomous systems. One of the reasons why EIGRP is able to converge quickly is because it prepares a feasible successor route as a backup before the successor route goes down. Which means it can switch to the backup route without having to query all the neighboring routers.