1.a person in charge of managing and maintaining a computer system of telecommunication system (as for a business or institution)
definición de system administrator (Wikipedia)
system administrator (n.)
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A system administrator, IT systems administrator, systems administrator, or sysadmin is a person employed to maintain and operate a computer system and/or network. System administrators may be members of an information technology (IT) or Electronics and Communication Engineering department.
The duties of a system administrator are wide-ranging, and vary widely from one organization to another. Sysadmins are usually charged with installing, supporting and maintaining servers or other computer systems, and planning for and responding to service outages and other problems. Other duties may include scripting or light programming, project management for systems-related projects, supervising or training computer operators, and being the consultant for computer problems beyond the knowledge of technical support staff. To perform his or her job well, a system administrator must demonstrate a blend of technical skills and responsibility.
Many organizations staff other jobs related to system administration. In a larger company, these may all be separate positions within a computer support or Information Services (IS) department. In a smaller group they may be shared by a few sysadmins, or even a single person.
In some organizations, a person may begin as a member of technical support staff or a computer operator, then gain experience on the job to be promoted to a sysadmin position.
Unlike many other professions, there is no single path to becoming a system administrator. Many system administrators have a degree in a related field: computer science, information technology, computer engineering, information system management, or even a trade school program. Other schools have offshoots of their Computer Science program specifically for system administration.
Some schools have started offering undergraduate degrees in System Administration. The first, Rochester Institute of Technology started in 1992. Others such as Rensselaer Polytechnic Institute, University of New Hampshire, Marist College, and Drexel University have more recently offered degrees in Information Technology. Symbiosis Institute of Computer Studies and Research (SICSR) in Pune, India offers Masters degree in Computers Applications with a specialization in System Administration. The University of South Carolina offers an Integrated Information Technology B.S. degree specializing in Microsoft product support.
As of 2011[update], only five U.S. universities, Rochester Institute of Technology , New York City College of Technology, Tufts, Michigan Tech, and Florida State University  have graduate programs in system administration. In Norway, there is a special English-taught MSc program organized by Oslo University College  in cooperation with Oslo University, named "Masters programme in Network and System Administration." University of Amsterdam (UvA) offers a similar program in cooperation with Hogeschool van Amsterdam (HvA) named "Master System and Network Engineering". In Israel, the IDF's ntmm course in considered a prominent way to train System administrators.  However, many other schools offer related graduate degrees in fields such as network systems and computer security.
One of the primary difficulties with teaching system administration as a formal university discipline, is that the industry and technology changes much faster than the typical textbook and coursework certification process. By the time a new textbook has spent years working through approvals and committees, the specific technology for which it is written may have changed significantly or become obsolete.
Generally, a prospective will be required to have some experience with the computer system he or she is expected to manage. In some cases, candidates are expected to possess industry certifications such as the Microsoft MCSA, MCSE, MCITP, Red Hat RHCE, Novell CNA, CNE, Cisco CCNA or CompTIA's A+ or Network+, Sun Certified SCNA, Linux Professional Institute among others.
Sometimes, almost exclusively in smaller sites, the role of system administrator may be given to a skilled user in addition to or in replacement of his or her duties. For instance, it is not unusual for a mathematics or computing teacher to serve as the system administrator of a secondary school.
Some of this section is from the Occupational Outlook Handbook, 2010-11 Edition, which is in the public domain as a work of the United States Government. The subject matter of system administration includes computer systems and the ways people use them in an organization. This entails a knowledge of operating systems and applications, as well as hardware and software troubleshooting, but also knowledge of the purposes for which people in the organization use the computers.
Perhaps the most important skill for a system administrator is problem solving -- frequently under various sorts of constraints and stress. The sysadmin is on call when a computer system goes down or malfunctions, and must be able to quickly and correctly diagnose what is wrong and how best to fix it.
System administrators are not software engineers or developers. It is not usually within their duties to design or write new application software. However, sysadmins must understand the behavior of software in order to deploy it and to troubleshoot problems, and generally know several programming languages used for scripting or automation of routine tasks.
Particularly when dealing with Internet-facing or business-critical systems, a sysadmin must have a strong grasp of computer security. This includes not merely deploying software patches, but also preventing break-ins and other security problems with preventive measures. In some organizations, computer security administration is a separate role responsible for overall security and the upkeep of firewalls and intrusion detection systems, but all sysadmins are generally responsible for the security of computer systems.
A system administrator's responsibilities might include:
In larger organizations, some tasks listed above may be divided among different system administrators or members of different organizational groups. For example, a dedicated individual(s) may apply all system upgrades, a Quality Assurance (QA) team may perform testing and validation, and one or more technical writers may be responsible for all technical documentation written for a company.
In smaller organizations, the system administrator can also perform any number of duties elsewhere associated with other fields:
System administrators, in larger organizations, tend not to be system architects, system engineers, or system designers. However, like many roles in this field, demarcations between system administration and other technical roles often are not well defined in smaller organizations. Even in larger organizations, senior system administrators often have skills in these other areas as a result of their working experience.
In smaller organizations, IT/computing specialties are less often discerned in detail, and the term system administrator is used in a rather generic way — they are the people who know how the computer systems work and can respond when something fails.
The term "system administrator" may also be used to describe a security privilege which is assigned to a user or users of a specific computer, server, network or other IT System.
The Administrator level of system access permits that user to gain access to, and perform high level configuration features of the system.
This user privilege level is more commonly referred to within a computer or IT system as "administrator" (without the epithet "system"). It may also be called superuser or root.
For example a computer may have a user named "Administrator" or "Root" which has a security level sufficient to install software, or give other users access to the system. Alternatively a user of a system may be assigned to an "Administrators" group, membership of which grants them the same privilege as the Administrator user. These users may be referred to as System Administrators, referring only to the system privilege level, rather than the job function.
For security reasons, the name of an Administrator user or Administrators security group is often changed locally so that it is less easy to guess, in order to reduce system vulnerability to access by hackers.
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