Posts

Featured Post

Networking and Telecommunication

Image
Networking and Telecommunication Communication Communication means sending and receiving information between two or more persons. Telecommunication Telecommunication is a system of transmission of sounds, images, texts or data in the form of electronic signals. Data communication A data communication system is the collection of hardware, software and other devices that allows to exchange data, information and voice between two or more devices through a wire or radio waves. The components of data communication are data, sender, medium, receiver and protocol. Any two examples of data communication are e-mail and chat Data transmission mode Data transmission mode is the way of transmitting data from one device to another. The modes of data transmission are simplex mode, half duplex mode, full duplex mode Simplex mode The mode of transmission where transmission can take place in only one direction is called simplex mode. Examples of simplex mode are TV Broadc
5 comments
Read more

Internet & E-mail

Image
Internet and Its Services: What is internet? Ans: Internet is an interconnection of several thousands of computers of different types belonging to the various networks all over the world. Who controls the Internet? Ans: Different organization like ISOC (Internet Society), W3C (World Wide Web Consortium), IAB (Internet Architecture Board), IEFT (Internet Engineering Task Force), IRTF (Internet Research Task Force), IESG (Internet Engineering Steering Group) and INIC (Internet Network information Centre) gives directive and guideline for the proper use of internet. Why is internet called ‘network of networks’? Ans: The internet is called ‘network of networks’ because all the smaller networks of organizations are linked together into the one giant network called the internet. Which communication protocol is used by the internet? Ans: TCP/IP is the communication protocol used by the internet. List the components required for internet connection. Ans: The
Post a Comment
Read more

Computer Security

Image
Computer Security   Computer Security What is computer security? Ans: The security given to the computer for the protection of hardware, software and data from being lost or damaged due to accidental or intentional harm is known as computer security. What are the main objectives of computer security? Ans: The main objectives of computer security involves ensuring confidentiality, integrity, and availability of assets or information. What are the major types of security? Ans: The types of security are: Hardware security Software security Write down any five possible threats to computer security? Ans: five possible threats to computer security are: Human error Computer crime Natural disasters War and terrorist activity Hardware failure Why do we need to provide security to our computer system? Ans: We need to provide security to our computer system because if we do not take care of a computer system than our valuable data, informa
Post a Comment
Read more

Computer Virus

Image
1)      What is computer virus? Ans: Computer virus is a type of computer program which is written by the programmer with the intent of destroying or damaging the data and programs residing in the computer system. 2)      Write down the purpose of creating computer virus. Ans: The purpose of creating computer virus are: i) To stop computer piracy ii) To entertain user by displaying interesting message and pictures iii) To destroy data, information and files iv) To expose the programmers ability v) To earn money 3)      How does a computer virus spread from one computer to another? Ans: A virus spreads from one computer to another by: i) Sharing infected internal portable disk like floppy disk, pen drive, CDs, etc. ii) Opening a virus infected email, messages and attached files iii) Downloading files and programs form the websites which are not secure iv) Exchanging data and information over a network 4)      What are the symptoms of computer virus? Ans: The s
Post a Comment
Read more