A network naming and administration system for smaller networks that was developed by Sun Microsystems. 

Network infrastructure refers to the hardware and software resources of an entire network that enable network connectivity, communication, operations and management of an enterprise network.

A computer circuit board or card that is installed in a computer so that it can be connected to a network. 

A device that serves as a common interface for various other devices within a local area network (LAN), or as an interface to allow networked computers to connect to an outside network.

A method of security management for computers and networks. Anti-threat software is installed only at specific points such as servers that interface between the outside environment and the network segment to be protected.

An umbrella term for a combination of hardware and software systems that protect computer networks from unauthorized access and malicious activity.

An application designed for the transfer of commands, messages, programs, and jobs among different computing systems in a network. In effect, NJE facilitates the deployment of a "network of networks." 

In the OSI model, the Network layer is Layer 3. It is responsible for packet forwarding including routing through intermediate routers, whereas the data link layer is responsible for media access control, flow control and error checking.

Network Management refers to the activities, methods, procedures, and tools that pertain to the operation, administration, maintenance, and provisioning of networked systems.

Network monitoring is the use of a system that constantly monitors a computer network for slow or failing components and that notifies the network administrator (via email, SMS or other alarms) in case of outages. It is part of network management.

The predominant protocol used by computer clients and servers for managing the notes posted on Usenet newsgroups. NNTP replaced the original Usenet protocol, UNIX-to-UNIX Copy Protocol (UUCP) some time ago. 

A program that helps a network administrator view and manage the conditions in a computer network. Using the Network Node Manager, an administrator can view the network in an easy-to-see graphical format. 

A computer operating system system that is designed primarily to support workstation, personal computer, and, in some instances, older terminal that are connected on a local area network (LAN). 

A place from which administrators supervise, monitor and maintain a telecommunications network. Large enterprises with large networks as well as large network service providers typically have a network operations center.

A network perimeter is the boundary between the private and locally managed-and-owned side of a network and the public and usually provider-managed side of a network.  

Intermediary systems that are used to provide customer services, log transactions, carry out requests, and update files.