Network Security
A network is a
set of devices associated by communication links, and these devices must be
able to send and obtain data produced by other devices in the network. The
Internet is a computer network consisting of several interconnected networks
connecting computers and network devices throughout the world using standard
communication protocols. In 70s-80s, the Internet was used only for education
and military purposes and was rarely used by general public. At that time, the
network size was small and was confined to universities or defense organization.
The networks were isolated from the world and security was not as critical as
today. In the late 80s and early 90s, various networks started getting
interconnected and the use of Internet began to grow. The need for security
started increasing as universities, government and military installations began
to connect with each other. The Defense Advanced Research Projects Agency
(DARPA) is an agency of the US Department of Defense in charge for the
development of evolving technologies for usage by the military.
Role of the Internet is essential in our routine
activities. It has brought plenty of information to our fingertips. But it has
also raised the possibility of unauthorized users having access to the
confidential information which they can steal by various means. Our precious
and true confidential data such as personal profiles and credit card details
are transferred through networks.
A
recent study confirms that there is a significant growth in cybercrime
throughout the world. Hence, network security is vital for all types of
network. Network security composes the methods taken by the administrator to
prevent illegitimate access and improper use of network resources. These
resources may be computers, printers, files and any other devices in the network.
In designing security solutions, there are some essential elements, namely,
confidentiality, integrity, availability, and non-repudiation which need to be
considered
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