cisco.com
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Cisco.com is the official Cisco site offering product information, support docs, and learning resources for network professionals. It hosts technical articles, white papers, and tutorials on IP networking, routing, switching, and related network protocols.
More resources on Internet Protocols
Wireshark User's Guide
Practical tool for analyzing internet protocols
Beej's Guide to Network Programming
Free guide to internet sockets and protocols
Introduction to the Internet
Stanford CS144 Lecture 1 on Internet protocols basics
Computer Networks
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
CS144: Introduction to Computer Networking
Learn internet protocols and computer networking fundamentals with Nick McKeown's CS144 course. Explore network architecture and design!
ietf.org
IETF.org is the official site of the Internet Engineering Task Force, the body that develops and publishes Internet standards. It hosts RFCs/Internet-Drafts, working-group details, meeting materials, and educational resources on core Internet protocols.