Node 
. . the first node >> 
In communication network,a node is a connection point, either a redistribution point or a communication endpoint.A physical network node is an active electronic device that is attached to a network, and is capable of sending, receiving, or forwarding information over a communications channel.
Example: modem,printer.
In communication network,a node is a connection point, either a redistribution point or a communication endpoint.A physical network node is an active electronic device that is attached to a network, and is capable of sending, receiving, or forwarding information over a communications channel.
Example: modem,printer.
Client
A client is an application or system that accesses a remote service on another computer system,know as a server, by way of a network.It is the requesting program or user in a client relationship.
Server
A server is an application running on a computer that delivers a service. For example, a web server will deliver web pages when requested by a browser.The way a server and a client dialogs is called a protocol. For instance, HTTP is the protocol used between a browser and a web server.
Hub
A common connection point for devices in a network.Hubs are commonly used to connect segment of a LAN.A hub contains multiple ports.When a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.
Network Interface Card (NIC)
NIC is commonly referred to as a network adapter and is an expansion card that enables a computer to connect to a network such as a home network and the Internet using a Ethernet cable with a RJ-45 connector.
Network Operating System (NOS)
operating system > 
A networking operating system is an operating system that contains components and programs that allow a computer on a network to serve requests from other computer for data and provide access to other resources such as printer and file systems.
A networking operating system is an operating system that contains components and programs that allow a computer on a network to serve requests from other computer for data and provide access to other resources such as printer and file systems.
Host Computer
A computer system that is accessed by a user working at a remote location.Typically, the term is used when there are two computer systems connected by modems and telephone lines. The system that contains the data is called the host, while the computer at which the user sits is called the remote terminal.
Network Manager
Network Manager is a software utility aimed at simplifying the use of computer networks on Linux and other Unix-like operating systems.NetworkManager is designed in two components: a service which manages connections and reports network changes, and a graphical desktop applet which allows the user to manipulate network connections.
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