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.

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.

A procedure for identifying active hosts on a network, either for the purpose of attacking them or for network security assessment. 

A specialized field in computer networking that involves securing a computer network infrastructure. It consists of provisions and policies to prevent and monitor unauthorized access and usage of a computer network and network-accessible resources.

Measures the current state of the server, the network and all active traffic. It can be performed using software or using a hardware attached to the remote system.

One of two types of hierarchical addresses used to implement Open Systems Interconnection (OSI) network layer addressing. 

A company that provides backbone services to an Internet service provider (ISP), the company that most Web users use for access to the Internet. 

A network storage is a system that maintains copies of digital data across high-speed local area network (LAN) connections. It is designed to back up files, databases and other data to a central location that can easily accessed via standard network protocols and tools.

A computer networking device that links network segments or network devices.