During the past 25 years, every sphere of industry has been
covered by computer network of various types. Learning the basic of how these
computer network works help us to better use them and also increases our
knowledge of changing world around us.
What is
network device?
A network device
consists of special communication hardware so as to make the physical
connections to other device. Most of the modern network devices have
communication electronic built onto their circuit boards.
Some of the PCs, older Xbox consoles, and older devices
don’t have the communications hardware but it can be set up by plugging in
separate network adapters in the form of USB peripheral.
Some old desktop PCs need physically inserting large add-in
cards on the system motherboard which gives origin to the term Network
Interface Card.
New generation of consumer appliances and gadgets are being
built as network devices whereas older devices were not.
Roles
of devices on computer networks
Devices on computer networks function in different ways. The
two common roles are clients and servers. PCs, phone, tablets and network
printers are common examples of clients. Clients make request and use data
stored in network servers. Servers include devices with large amount of memory
and high performance processor to support clients. Examples of network servers
are Web servers and game servers. Network generally supports many clients than
servers. Clients and servers are also called network nodes.
Network devices are capable of working as both clients and
servers. For e.g. in a peer to peer networking a pair of devices share data
with each other, in this process one acts as a server hosting data while
simultaneously working as a client to request data from peer devices.
Special
purpose network devices
Server and client nodes can be added or removed from the
network without blocking communication between other devices. However other
types of network hardware still exist for allowing a network to run
·
A network hub allows any node connected to it
directly send data to other
·
Network switches function as same as hubs but
they include additional hardware logic that opens up multiple communication
paths that enables multiple connected nodes to send data to each other
·
Network routers further increase the
capabilities of network switches by allowing connections outward from itself to
other networks and joining them together without disturbing the functionality
of each of them individually.
·
A network repeater accepts the physical signals
sent across a network connection and increase their strength so that the signal
can travel longer distance.
·
Network bridge connects two different types of
physical networks links together
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