WWW Server (apache) NEVER RUN AS ROOT! Have an apache user (or some web user with limited abilities)
Service ports open to allow connections.
80 http/443 https
Client (browser)
URL
http://www.you.com/
DNS
Load Balancing
Round Robin
Load Balancing Server

• A web page gets the data from different servers.

When a page is served. A request is made for a file. If the file is available it is served.
Check the log files to see what people are accessing and who referred them.
Errors also get logged.

CGI (Common Gateway Interface)

PHP (PHP Hypertext Preprocessor)

Change passwords for any tools you install with default passwords (such as admin or password)
Virtual Interfaces

Header information is sent before the file is served.