Over at CBT Nuggets, several of the CCIE instructors polished up our CCIE-level videos to make sure we are efficiently teaching you the Core Concepts you must master en route to your CCIE Certification. This sample Nugget is from the Layer 3 course found here:

https://www.cbtnuggets.com/it-training/cisco-ccie-routing-switching-v5-layer-3-technologies
This is one of the many Nuggets on Border Gateway Protocol (BGP) which I personally found to be a big challenge as I was working to my expert-level certification. Enjoy!