if you take a closer look at the new exam topics, some exam topics might give you reason to still study subjects from the above list of old exam topics. For instance, if you do another scan of the new ICND1 100-105 exam topics, you might notice these:http://www.lead4pass.com/100-105.html
Troubleshooting interface and cable issues (collisions, errors, duplex, speed)
Configure, verify, and troubleshoot VLANs (normal range) spanning multiple switches
The first of these two 100-105 exam topics does not list the term “collision domain”, but it does list the word “collision”. Certainly, to troubleshoot collision issues, you need to understand the concept of collision domains.