Need information on DMZ

[Daniel23]

Hi,
I was reading a article on internet which states information on network and internet security. This articles describes about multiple terms of Network security. I am looking for a complete description on DMZ. What is it means and what it stands for. Second thing what is social engineering. For what purpose this practice is carried out. And the last thing I want to know what is a ZOMBIE on internet. Thanks in advance.

[Snake08]

A DMZ, or demilitarized zone, is a sub-network isolated from the rest of the network by a firewall. This area is located between a private internal network (Local Area Network, LAN) and another network, generally public, such as the Internet. A DMZ is designed for installing servers that expose services to the local network, but also to the Internet is typically the case of Web servers and messaging. The purpose of the DMZ is to use the same servers internally and externally, without compromising the security of confidential data and applications of an enterprise.

[Zachary]

Social engineering refers to attack a computer system by the link most likely to commit a miscalculation: the human. When the attacker is knowledgeable about the structure of the body it is, it's easy to pretend to be one or two players of executives / managers and any pretext of emergency / constraints of society very serious , requesting sensitive information on computer system. The caller may be deceived by the hacker's knowledge of the organization of society and release of strategic information.

[Big Fish]

A zombie is a PC probably poorly protected and which has been infected by a virus or worm. This program allows a malicious hacker to take remote control of the PC and use it to send mail, attack other machines, etc.. An attacker can trigger a DOS attack if it has control of a large number of zombie machines. And in social engineering is imperative to control who has access to what information and under what conditions and that they can be transmitted. It is also important to ensure that each caller to whom he is dealing.