Daryl's TCP/IP Primer
http://www.tcpipprimer.com/index.cfm
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1. Disclaimer</option>
2. Overview and Scope</option>
3. Intro to Ethernet</option>
4. The Bottom of the OSI Model</option>
5. Why is IP so much more difficult than IPX?</option>
6. IP Addresses, Subnet Masks, and Subnetting</option>
7. Subnetting, Bit by Bit</option>
8. Daryl's Subnet Calculator</option>
9. Routing and Static Routes</option>
10. Troubleshooting</option>
11. TCP and UDP Communication</option>
12. Network Address Translation (NAT)</option>
13. The Domain Name System (DNS)</option>
14. Tips for Building an IP LAN</option>
15. Packet Analysis</option>
16. WAN Connectivity</option>
17. Questions and Answers</option>
18. Update Notifications/Comment Form</option>
19. Other Sources</option>
20. Glossary</option>
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http://www.tcpipprimer.com/index.cfm
Great Read... A def must for newbies...