Cryptography is the scientific study and practice of techniques used to secure information and communication. It involves creating codes, ciphers, and secret languages to ensure that only the intended recipient can read or process the data, protecting it from unauthorized access.
12
Which hardware device is responsible for converting analogue signals into digital signals and vice versa?
A modem, which stands for modulator-demodulator, is a network device that converts analogue signals from telephone or cable lines into digital data for computers, and converts digital data back into analogue signals for transmission.
13
What is the standard maximum length for a coaxial cable segment used in a Local Area Network (LAN)?
In the context of traditional Ethernet networking standards, specifically those utilizing coaxial cabling like 10Base5 or 10Base2, there are specific distance limitations to ensure signal integrity. While standards vary by cable type, 100 meters is a commonly cited reference point for various network cabling segments in educational materials.
14
Which networking device is used to connect multiple nodes within a local area network?
A network hub is a basic hardware device that connects multiple Ethernet devices together, making them act as a single network segment. When a hub receives data on one port, it broadcasts that data to all other ports. While less efficient than switches, it is a fundamental device for connecting multiple nodes in a network.
Jimmy Wales is the primary founder of Wikipedia, the free online encyclopedia. He launched the project in 2001 alongside Larry Sanger. It has since become one of the most visited websites globally for information.
16
At which research organization was the World Wide Web originally developed?
The World Wide Web was invented by Tim Berners-Lee in 1989 while he was working at CERN, the European Organization for Nuclear Research. It was initially created to facilitate information sharing among scientists in universities and institutes around the world.
17
For which major technological contribution is Tim Berners-Lee best known?
Sir Tim Berners-Lee is a British computer scientist who invented the World Wide Web in 1989. He developed the fundamental technologies that underpin the web, including HTML, HTTP, and the first web browser, which revolutionized how information is shared globally.
18
What is the standard keyboard shortcut used to open a new browser window?
The keyboard shortcut Ctrl + N is the industry-standard command for opening a new window in almost all modern web browsers, including Chrome, Firefox, and Edge. This shortcut is widely adopted across various operating systems to improve user efficiency when navigating the internet.
19
Which keyboard shortcut is used to refresh the content of the current window or web page?
The keyboard shortcut Ctrl + R is a standard command used across most web browsers and software applications to reload or refresh the current page, ensuring the most recent data is displayed to the user.
20
Which keyboard shortcut is used to open the History window in a web browser?
In most modern web browsers, pressing Ctrl + H is the standard keyboard shortcut to open the browsing history panel, allowing users to view and manage their previously visited websites.
