geeksforgeeks.org
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GeeksforGeeks is a comprehensive computer science education site offering tutorials, explanations, and coding practice on algorithms, data structures, and related CS topics. It features detailed articles and examples on routing algorithms (shortest path, Dijkstra, Bellman-Ford), graph theory, and extensive practice problems and interview prep.
More resources on Routing Algorithms
Khan Academy - Internet Routing
Free interactive lessons, mentioned in practitioner threads
Dijkstra's Algorithm for Shortest Path in Routing
Visualization praised in r/networking
Computer Networking
This course is designed to provide a full overview of computer networking. We’ll cover everything from the fundamentals of modern networking technologies and protocols to an overview of the cloud to practical applications and network troubleshooting. By the end of this course, you’ll be able to: ● describe computer networks in terms of a five-layer model ● understand all of the standard protocols involved with TCP/IP communications ● grasp powerful network troubleshooting tools and techniques ● learn network services like DNS and DHCP that help make computer networks run ● understand cloud computing, everything as a service, and cloud storage
cisco.com
Cisco.com is the official Cisco site offering product information, support, and extensive networking documentation. It provides tutorials, white papers, and configuration guides on routing protocols (such as OSPF, BGP, and EIGRP) and core routing concepts for building and optimizing Cisco networks.
Routing TCP/IP, Volume 1
Routing TCP/IP, Volume 1 - A book resource
Routing Algorithms
Coursera course: Algorithms on Graphs