Computer Networking
Computer
Network
Two or
more computers or peripherals connected together for sharing data (files) or
hardware resources such as printer form a network. Networks may vary in term of
size (the number of computers connected together), complexity (the way
computers are connected) and geographical spread.
The
network specific to the users within the organisation is called the Intranet.
Internet is also a network but it is huge and open to all.
The
computer in a network is known as node. Each node is connected through either
cables or wireless medium.
How a
computer network helps?
A
computer network is useful in the following ways:
|
1.File sharing What
if you need to access a file stored on another computer? A network makes it
easy for everyone to access the same file or software application and prevent
from accidentally creating various version 2.
Collaboration and communication It's
hard for a team to work together if they do not know what the other team
member is doing. network allows the users to share files, view other people's
work and exchange ideas more efficiently 3.
Sharing computer peripherals With
a network, several computers can share the same printer, scanner and other
similar resources. 4.
Remote access Network
allows greater mobility while maintaining the same level of productivity.
With remote acces in place, users are able to access the same files, data and
messages even when they are not presene 5.
Data backup A
network makes it easier to back up all the data or files on a server or other
storage medium. Advantages
of computer network Computers
in a network has the following advantages: ·
Cost effective as the resource can be used by multiple
persons ·
Software licences are likely to be cheaper than buying
several standalone licences ·
Save time while sharing files ·
Need not depend on Internet connectivity or its bandwidth to
transfer files ·
All types of files such as text, audio, video, graphics can
be shared easily ·
Security is good - users cannot see other users' files
unlike on stand-alone machines. Disadvantages
of computer network Computers
in a network has the following disadvantages: ·
Purchasing the network cabling and file servers can be
expensive. ·
Managing a large network is complicated, requires training
and requires a network manager to manage. ·
If the file sever has a fault then users may not be able to
run applications. The work will be come to a halt. · If there is a problem in a
network then all the computers connected to the network cannot be used. · If there are more number of
users than the defined number then the transfer and sharing of files may
become slow. Types
of Transmission/Communication Media Computers
are connected to each other on a network either through wires or
electromagnetic medium. Communication medium is defined as the means by which
data travels through a network. Wired
connection When
the computer is connected to the Internet using a wire, it is called a wired
connection. Ethernet cable (cable used for connecting to the Internet) is
used to transfer data between connected PCs. In a small wired network, a
single router may be used in connect all the computers. Know
More The
Bluetooth technology got its name in honour of Harald Bluetooth, the king of
Denmark in the mid-tenth century. Wired
connection tends to work slightly faster than a wireless connection though it
provides convenience of using it within range. Let
us compare the differences between wired and wireless connection. Wired
Connection It
provides reliability and stability and the signal is not influenced by other
connections. It
is much faster than wireless networks. Any
unauthorised user is unable to connect to the network unless their device is
connected using an Ethernet cable. Ethernet
cables, switches, routers, and other hardware is relatively costly. Wireless
connection Wired
networks can be inflexible in terms of mobility and to use your device in a
different location, it is necessary to run extra cables and switches to
connect a device to the network. Wireless
networks are prone to interference by other networks, wireless enabled
devices, and
objects such as walls that can obstruct the connection. Wired
network installations can take longer to set up devices such as the routers,
switches, and hubs and configure security applications and firewalls. It
lacks the data transmission speed capability of wired networks. It
is less secure than wired networks since the communication signals are
transmitted through radio wave and it can easily be intercepted. The
cost of implementing a wireless network is relatively inexpensive. Wireless
networks allow you to be more mobile with the flexibility to access the
network from any location using any type of wireless enabled device. The
installation of a wireless network is faster and easier because it requires
less equipment, Know
More Router
is a device used to transfer the information between computer networks.
Bandwidth is the amount of data that can be transmitted over a network in a certain
amount of time. It was expressed in bits per second (bps), these day since
the network links have greater capacity, therefore, it is measured in
millions of bits per second (megabits per second, or Mbps) or billions of
bits per second (gigabits per second, or Gbps). The
more bandwidth a data connection has, the more data it can send and receive
at one time. Bandwidth can be compared to the amount of water that can flow
through a water pipe. The bigger a the pipe, the more water can flow through
it at one time. Types
of Computer Network Computer
networks classified on the basis of geographical spread are: 1.
Local Area Networks (LAN) 2.
Personal Area Network (PAN) 3.
Metropolitan Area Network (MAN) 4.
Wide Area Networks (WAN) |
Let's Explore
All versions of
Microsoft Windows have had an MS-DOSlike command-line interface (CLI) called
Command Prompt. To open the command prompt in Windows, press Windows key + R.
Type the command cmd in the Open text box. Click the OK button. You will get
the black screen. Type the command dir. To clear the screen type cls.
So,
that’s your activity for today we will meet tomorrow.
Thank
You!!
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