These are the resources I personally used to study for the CCNP ENCOR and ENARSI exams. Unlike most people I am probably more heavily leaning on the "Learn it" part of certifications and less the "Pass it" part. This means this list probably goes much deeper then you might expect from a normal study resource list. I am providing this as a more comprehensive list that can be used for additional study materials or refrence materials for new network engineers.
I have placed ★ characters next to resources I think are especially valuble.
CCNP Enterprise Core (350-401 ENCOR) v1.1 ★
Cisco CCNP Enterprise Advanced Routing and Services (300-410 ENARSI) ★
Cisco CCNP Designing Enterprise Networks (300-420 ENSLD)
Cisco CCNP Implementing Cisco SD-WAN Solutions (300-415 ENSDWI)
ENCOR (350-401) v1.1 Video Training Series (2023 Blueprint)
ENARSI (300-410) v1.1 Video Training Series (2023 Blueprint)
Spanning Tree Protocol (STP) Deep Dive ★
Virtual Private Network (VPN) - Deep Dive
Advanced Routing - Deep Dive ★
Network Security - Deep Dive Replay
Configuring an MPLS Network from Scratch
Cisco Multicast Routing for CCNA, CCNP, and CCIE Candidates
Intermediate System to Intermediate System (IS-IS) Routing Protocol Fundamentals
Cisco Catalyst 3560 and 3750 QoS Simplified... Seriously!
Cisco CCNP ENCOR 350-401 Gold Bootcamp - Incomplete
Note: I highly recomend checking out Ebay for any of these books you are interested in. Many are older and can be found easily in good shape for not much money. Not everything is available there, but it's a great way to pickup solid options for filling out your library.
CCNP and CCIE Enterprise Core ENCOR 350-401 Official Cert Guide, 2nd Edition ★
CCNP Enterprise Advanced Routing ENARSI 300-410 Official Cert Guide, 2nd Edition ★
CCNP Enterprise Design ENSLD 300-420 Official Cert Guide, 2nd Edition
31 Days Before Your CCNP and CCIE Enterprise Core Exam
CCNP Enterprise: Core Networking (ENCOR) v8 Lab Manual, 2nd Edition
CCNP Enterprise: Advanced Routing (ENARSI) v8 Lab Manual
101 Labs - Cisco CCNP Enterprise
Classic Computer Science Problems in Python
Network Programmability and Automation, 2nd Edition ★
Programming and Automating Cisco Networks
Ansible: Up and Running, 3rd Edition
Routing TCP/IP, Volume 1, 2nd Edition ★
Routing TCP/IP, Volume 2, 2nd Edition ★
EIGRP Network Design Solutions ★
OSPF Network Design Solutions, 2nd Edition ★
BGP ★
OSPF: Anatomy of an Internet Routing Protocol ★
CCNP Routing and Switching ROUTE 300-101 Official Cert Guide
CCNP Routing and Switching SWITCH 300-115 Official Cert Guide
CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide
End-to-End QoS Network Design: Quality of Service for Rich-Media & Cloud Networks, 2nd Edition
Designing for Cisco Network Service Architectures (ARCH) Foundation Learning Guide
SD-WAN: Example-based Study Guide: Volume 1
SD-WAN: Example-based Study Guide: Volume 2
CCIE Routing and Switching v5.0 Official Cert Guide, Volume 1, 5th Edition
CCIE Practical Studies, Volume I
CCIE Practical Studies, Volume II
Advanced MPLS Design and Implementation
Cisco CML Personal ★ + MINISFORUM MS-A2 Mini Workstation (96GB RAM, AMD Ryzen 9 9955HX)