System Administrator
System administrator is any person charged with managing a network or any portion of a network. Sometimes, people might not realize that they are a system administrator. In small companies, for example, programming duties and system administration are sometimes assigned to a single person. Thus, this person is a general, all-purpose technician. They keep the system running, add new accounts, and basically perform any task required on a day-to-day basis. This, for your purposes, is a system administrator.
Hacker
The term hacker refers to programmers and not to those who unlawfully breach the security of systems. A hacker is any person who investigates the integrity and security of an operating system. Most commonly, these individuals are programmers. They usually have advanced knowledge of both hardware and software and are capable of rigging (or hacking) systems in innovative ways. Often, hackers determine new ways to utilize or implement a network, ways that software manufacturers had not expressly intended.
Cracker
A cracker is any individual who uses advanced knowledge of the Internet (or networks) to compromise network security. Historically, this activity involved cracking encrypted password files, but today, crackers employ a wide range of techniques. Hackers also sometimes test the security of networks, often with the identical tools and techniques used by crackers. To differentiate between these two groups on a trivial level, simply remember this: Crackers engage in such activities without authorization. As such, most cracking activity is unlawful, illegal, and therefore punishable by a term of imprisonment.
Security Specialist
A security specialist is anyone charged with securing one or more networks from attack. It is not necessary that they get paid for their services in order to qualify in this category. Some people do this as a hobby. If they do it, they are a specialist.
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