The series is a third-edition compilation of lab workbooks and theory guides created by a prominent Cisco Learning Partner (widely associated with the "INE" brand, though generic versions exist). The "Layer 3 Technologies" volume is a standalone PDF or eBook that combines:

The Layer 3 domain in CCIE RS v5 covers both IPv4 and IPv6. It focuses heavily on interior and exterior routing protocols, emphasizing implementation, optimization, and troubleshooting.

For each topic, spend:

Among the vast sea of study materials available to candidates, one specific resource has achieved near-legendary status among aspirants: the study guides often referred to by the search term

A legitimate gives you a complete offline reference library. Many candidates convert it to a Kindle or iPad format to study during commutes.