What is Computer Network?
What is Computer Network?
A communication system for connecting computers/hosts. When two or more than two electronics devices are interconnected in order to share files, software, resources either by wired or wireless medium, it is...
What is Firewall?
Any system or device that allows safe network traffic to pass while restricting or denying unsafe traffic. Firewalls are usually dedicated machines running at the gateway point between your local network and outside world,...
What is IPSEC?
IPsec provides a mechanism for secure data transmission over IP networks, ensuring confidentiality, integrity, and authenticity of data communications over unprotected networks such as the Internet. IPsec encompasses a suite of protocols and is...
What is Virtual Private Network?
The internet is a worldwide publicly accessible IP Network. Due to its vast global proliferation, it has become a viable method of interconnecting remote sites. However, the fact that it is a public infrastructure...
What is Data Encryption, Decryption and Cryptography?
Cryptography
Cryptography is derived from the Greek words; kryptos, “hidden”, and graphein, “to write” or “hidden writing”. Cryptography is the science of using mathematics to encrypt and decrypt data. Cryptography enables you to store sensitive...
Software Development Life Cycle
Traditional and Structural programming
This is the first programming approach used in the beginning. Structure programming is associated with top down approach to design. So large routines are broken down into smaller modular routines. Here,...
The processor
The processor
A microprocessor is a multipurpose, programmable, clock driven, register based electronic device that reads binary instructions from a storage device called memory, accepts binary data as input and processes data according to those...
Advantages of Simulation
Introduction
A simulation is the manipulation of the model in such a way that it operates on time or space to compress it thus enabling one to perceive the interaction that would not otherwise...
Computer History
Computer History
Abacus
Abacus is first calculating machine invented by human beings almost 3000 years ago. The purpose of abacus was to add, subtract, multiply, divide, large numbers. It may have originated in China or Egypt...
Power Supply
Power Supply
The internal power supply is responsible for converting your standard household power into a form that your computer can use. The power supply is responsible for powering every device in your computer; if...