Jeremy Cioara’s course is a masterclass in BGP fundamentals that has stood the test of time. While the exam is gone, the training is still an outstanding resource for any network engineer who wants to truly understand how BGP selects paths, filters routes, and scales in a service provider environment. Pair it with modern Cisco documentation and lab practice for best results today.
If you are looking to get certified today using a similar skill set, you should look at the certification. Review: CBT Nuggets — Cisco CCIP BGP (642-661)