Operational guidance / Best Current Practice

comp.dcom.cabling FAQ
FAQ on cabling types (CAT5, fibre etc)
RFC1912
Common DNS Operational and Configuration Errors
RFC1918
Address Allocation for Private Internets
RFC2182
Selection and Operations of Secondary DNS Servers
RFC2317
Classless IN-ADDR.ARPA delegation
RIPE-203
Recommendations for DNS SOA Values

Technical / protocol specifications

RFC791
Internet Protocol (IP)
RFC792
Internet Control Message Protocol (ICMP)
RFC793
Transmission Control Protocol (TCP)
RFC952
DoD Internet host table specification (predates DNS)
RFC1034
Domain names - concepts and facilities
RFC1035
Domain names - implementation and specification
RFC1122
Requirements for Internet Hosts - Communication Layers
RFC1123
Requirements for Internet Hosts - Application and Support
RFC1939
Post Office Protocol - Version 3
RFC2328
OSPF Version 2
RFC2616
Hypertext Transfer Protocol - HTTP/1.1
RFC2821
Simple Mail Transfer Protocol
RFC2822
Internet Message Format

Bizarre RFCs

RFC1149
Standard for the transmission of IP datagrams on avian carriers
RFC1925
The Twelve Networking Truths
RFC2321
RITA - The Reliable Internet Troubleshooting Agent
RFC2549
IP over Avian Carries with Quality of Service (updates RFC1149)
RFC3184
IETF Guidelines for Conduct
RFC3514
The Security Flag in the IPv4 Header

Complete index to RFCs