Some times everyone wonder how big is the Internet. How many hosts ? , How many in each domain ? and things like that ...
The folks at nw.com have a cool page of Internet Domain Survey. Try that, its cool.

The x-kernel Protocol Framework: The x-kernel is an object-based framework for implementing network protocols. It defines an interface that protocols use to invoke operations on one another (i.e., to send a message to and receive a message from an adjacent protocol) and a collection of libraries for manipulating messages, participant addresses, events, associative memory tables (maps), threads, and so on.

Transmission Control Protocol

• TCP: Detailed Behavior of TCP over ATM
• TCP: TCP and ATM in Wide Area Networks
• PC-Mac TCP/IP & NFS FAQ FAQ
• TCP: Assorted experiments with TCP/IP over ATM wide area links
• TCP: Registered TCP and UDP Port Numbers (From Thomas Riemer at Wesleyan University)
• TCP: Introduction (From Yale University)
• TCP: RFC - RFC793
• TCP: TCP/IP index (From Yahoo)
• TCP: Well Known Port Numbers (From Thomas Riemer at Wesleyan University)

User Datagram Protocol

• Internet Protocols
• UDP (User Datagram Protocol) (the RFC - RFC768)

Internet Protocol

• IP Protocols
• Default IP TTL Values
• IP: Next Generation : IETF Charter
• IPng from Sun.Com Playground
• IP: Next Generation description (From Sun Microsystems)
• IP: Next Generation student project (From Trinity College Dublin)
• IP: Reference Library
• IP: Understanding IP Addressing
• 6 Bone Home PageThe 6bone is an IPv6 testbed to assist in the evolution and deployment of IPv6 [often referred to as IPng] in the Internet. These pages provide the primary information about the 6bone and will hopefully give you what you need to know to participate. The 6bone activity is part of the ngtrans effort under the IETF.
• IPng (Internet Protocol - Next Generation) Home Page (Information about the draft standard for the next version of the IP protocol, including quality-of-service provisions and expanded domain naming)

  IP Security Protocols

  • Secure Sockets Layer (SSL) (Netscape secure TCP connectivity proposal to IETF)
  • Kerberos FAQ
  • CounterPlaneWant to see how 40bit keys are cracked ?
  • The Rotherwick Firewall Resource

  Other IP related Links

  • Winsock Related World Wide Web Pages
  • Windows Sockets FAQs
  • Dynamic Host Configuration (dhc) (From Bucknell University)
  • IP: Multi Layer Routing
  • DNS Resources Directory

  IP QOS

  • Cisco VoIP Solutions
  • Voice on the Net
  • IP Telephony

  IP Multicast

  • IP Multicast Initiative (IPMI) home page
  • IP Multicast , from Cisco.
  • MBONE: IP Multicast

  Internetworking IP

  • IP: Understanding ARP Servers and multiprotocol VCs in an ATM environment
  • IP Over ATM Work Group
  • IP Over Asynchronous Transfer Mode (ipatm)
  • IP: ATM multicast related Internet Drafts
  • IP: Methods for Implementing IP on ATM Networks (Robert E. Larson)
  • IP over ATM: A Framework Document
  • Introduction to Internetworking

  Internet Routing Protocols

  • Routing Basics
  • Routing Information Protocol
  • Interior Gateway Routing Protocol and Enhanced IGRP
  • Open Shortest Path First
  • Border Gateway Protocol
  • OSI Routing
  • Multicast Routing
  • OSPF DESIGN GUIDE
  • OSPF FAQ
  • IP routing
  • Modular Internet Routing from the Gatedaemon (GateD) Consortium

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  Ethernet

  • Ethernet Page
  • Ethernet/IEEE 802.3
  • An Additional Ethernet Tutorial
  • Ethernet Tutorial
  • 100Base-T Fast Ethernet Migration Guide
  • Strategic Directions: 100Base-T Fast Ethernet
  • CDMA Technology Site (Code Division Multiple Access)
  • Ethernet: Dan Kegel's Fast Ethernet Page
  • Ethernet: FAQ
  • Ethernet: Big-LAN FAQ
  • Ethernet: Info (FAQ and lots more)
  • Ethernet: Information from the University of Texas
  • Ethernet: Reference page
  • Fast Ethernet - Alternative Technologies
  • Ethernet Home Page.A lot of information on Ethernet Technology.
    

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  Gigabit Ethernet

  • Introduction to Gigabit Ethernet , from Cisco.
  • Gigabit Ethernet Technology Tutorial
  • Gigabit Ethernet Technical Overview
  • Gigabit Ethernet Alliance

  Token Ring

  • Token Ring/IEEE 802.5
  • Token Ring Tutorial
  • LAN: Local Area Networks (Resources and Information)

  ISDN

  • Nortel Digital Velocity ISDN
    
  • ISDN Primer
  • ISDN User's Guide
  • ISDN and Data Networking
  • Bellcore
  • ISDN InfoCentre
    
  • ISDN Informationbase
    
  • ISDN Solutions for Linux
    
  • ISDN Tutorial
    
  • The Internet and ISDN
    
  • Dateline: ISDN
    
  • Dan Kegel's ISDN Page extensive list of links.

  Other Networking Technologies

  • Cable Modems: Overview
  • Cable TV: Cable Modem Resources
  • Data Communications Its the home page for the magazine Data Communications, a real nice site contains a great deal of info on Data Communications including a collection of Tutorials , Buyers guide ,Lab test reports etc
  • Internetworking Research Projects (US Navy)Reliable Multicast,RSVP,MGEN,IVOX,IPng ....
  • http://frame-relay.indiana.edu/
  • Prof Jain's Frame Relay Page
  • Frame Relay: Search Yahoo
  • SMDS: FAQ and Archives (Switched Multimegabit Data Service)
  • Switched Multi-Megabit Data Service (SMDS) Tutorial
  • High Speed Networks: Introduction to 100Base-T: "Fast Ethernet"
  • High Speed Networks: High Performance Networks and Distributed Systems Archive
  • High Speed Networks: HIPPI in Detail (High-Performance Parallel Interface)
  • FDDI FAQ
  • Fiber Channel Association
  • Fiber Channel Introduction
  • HIPPI Networking Forum
  • The Fastest Network in the Digital Studio: Serial HIPPI