Useful Web sites

LANs
Switched ETHERNET
VLAN (Virtual LAN) information


IP addressing
Classless Inter-Domain Routing (CIDR)
Network Address Transl. (NAT)


Application layer
How Search Engines Work


Security
Intro to Public-Key Cryptography
Intro to SSL
The SSL Protocol
openssl software
Creating CA
Firewalls - Frequent Questions
Virtual Private Networks - VPNs