• Network administrator: Information from Answers.com
  A person who manages a local area communications network (LAN) within an organization. Responsibilities include network security, installing new applications, distributing software upgrades, monitoring daily activity, enforcing licensing agreements, developing a storage management program and providing for routine backups.
  network administrator A person who manages a local area communications network (LAN) within an organization
  administrator information network reference
  in About Technology > About Roles & Tasks with administrator network
• System administrator: Definition and Much More from Answers.com
  A person who manages the computer systems in an organization. The responsibilities of a system administrator and network administrator often overlap; however, the system administrator is more geared to the computer hardware and less on the network, although in many cases, system and network administrator are one in the same, especially in smaller companies. A system administrator is involved with OS and hardware installations and configurations and may be involved with application installations and upgrades. A system administrator may also perform systems programmer activities.
  system administrator n. One who manages and maintains computer systems and software, as for a business or institution
  administrator definition reference system
  in About Technology > About Roles & Tasks with administrator

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