Active content or active code is a program code embedded in the contents of a web page. Examples are in Java, JavaScript and ActiveX. The embedded code is automatically downloaded and executed to the user's PC once the page is accessed by a browser. Although the code is basically useful, but it pose dangers where intruders can gather information (such as which web sites you visit) or to run malicious codes on your computer. 

A packet sniffer run by an attacker has the capability of capturing every data in information packet on a network and of decoding all seven layers of the OSI protocol model. The data may include user names, passwords, and other confidential information that travels over the network in plain text. Passwords captured by a packet sniffer allows an intruder to gain full control and launch attacks on systems. Cable modem users are more susceptible to packet sniffing than dial up users since entire neighborhoods of cable modem users are effectively part of the same LAN.

 

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