Chapter 12 | Computer Network and the Internet

 

Chapter 12| Computer Network and the Internet 

Very Short Question

a)     The largest forms of computer network is WAN.

b)    The two example of web browser are Google Chrome and Opera.

c)     ARPANET is designed on 1960’s.

d)    LAN is faster than WAN.

e)     On October 1, 1969 the first massage was sent over computer network.

f)      No Facebook is not a search engine program.

g)     Yes, I used internet at my home for study.

Short question

a)     The process of connecting two or more computers using cables or wireless technologies is called computer network.

Its types are: LAN, MAN and WAN.

b)    The Internet is a worldwide system that allows people to send messages, search information, watch videos, use websites, and communicate with anyone anywhere in the world.

Importance of Internet in Today’s World:

·        It helps us talk to people through email, chat, video calls, and social media instantly.

·        Students can learn online, watch videos, attend classes, and find information easily.

·        Companies use the internet for online banking, marketing, buying and selling goods.

·        We can find any information within seconds using search engines.

·        Movies, music, games, and social media are all available through the internet.

c)     Technologies used to connect millions of computers all over the world are:

·        Wi-Fi:

Wireless technology that connects devices without cables.

·        Optical Fiber Cables:

Very fast cables that carry data using light signals across long distances.

·        Satellite Communication:

Satellites in space help send internet signals to remote areas.

·        Mobile Networks (3G, 4G, 5G):

Mobile towers provide internet to smartphones and other devices.

·        Telephone Lines / DSL:

Older but still used technology that provides internet through telephone cables.

d)   Evolution of the Internet (Brief)

1.     ARPANET (1960s):
The Internet began as ARPANET, a network created by the U.S. Department of Defense to connect universities and share information.

2.     Email Introduced (1970s):
Email was developed and became one of the first major uses of the network.

3.     TCP/IP (1983):
A common communication system called TCP/IP was introduced. This allowed different networks to connect easily, forming the basic structure of today’s Internet.

4.     World Wide Web (1990):
Tim Berners-Lee invented the World Wide Web (WWW), web pages, and browsers. This made the Internet easy for everyone to use.

5.     Commercial Internet (1990s):
Internet became available for business and public use. Websites, search engines, and online services started growing.

6.     Broadband and Wi-Fi (2000s):
Faster connections like broadband, Wi-Fi, and mobile internet expanded internet access globally.

e)     A web browser is a program that helps you search, view, and explore web pages.

Examples of web browsers:

·        Google Chrome

·        Mozilla Firefox

·        Microsoft Edge

·        Safari

·        Opera

f)      Internet Explorer (IE) was a series of graphical web browsers developed by Microsoft and included as part of the Windows line of operating systems.

The uses of Internet Explorer:

·        Browsing websites

·        Downloading files

·        Accessing web applications

·        Viewing older/legacy web content

g)     To browse a website on the internet:

·        Connect to the internet using Wi-Fi, mobile data, or a wired connection.

·        Open a web browser (Chrome, Firefox, Edge, Safari, etc.).

·        Type the website address (URL) in the address bar (e.g., www.google.com

·        Press Enter to load the website and navigate using links or menus.

h)    Email (Electronic Mail) is a method of sending and receiving digital messages over the internet.

The uses of email are:

·        Communication with friends, family, and colleagues.

·        Sharing files like documents, images, and videos.

·        Business and office work, including sending reports and official messages.

·        Creating online accounts and receiving notifications or updates.

i)       Email address is a unique electronic address used to send and receive emails on the internet.

j)       It usually has three parts: username + @ + domain (example: name@domain.com

Examples of email addresses:

·        dedhgaunmavi@gmail.com

·        dhakalvi@yahoo.com

·        info@school.org

·        user01@outlook.com

k)     The rules for creating an email address are:

·        Use letters, numbers, and allowed symbols (., _, -).

·        Do not use spaces.

·        Include “@” between the username and domain.

·        Start with a letter or number and keep it easy to remember.

l)       To search any educational materials from the internet:

·        Open a web browser like Chrome, Firefox, or Edge.

·        Go to a search engine such as Google, Bing, or Yahoo.

·        Type keywords related to the topic you want (e.g., “Computers notes” or “Class 7 math worksheets”).

·        Press Enter and click on the links that match your study needs.

m)  The advantages and disadvantages of computer networks are :

Advantages:

·        Resource sharing (printers, files, software).

·        Easy communication between users.

·        Centralized data storage for easier access and backup.

·        Faster data sharing and collaboration.

Disadvantages:

·        Risk of viruses and hacking.

·        If the network fails, all users are affected.

·        Installation and maintenance can be costly.

·        Privacy and security issues may occur.

n)    Different between LAN and WAN.

LAN	WAN
·        Covers a small area like a home, school, or office.	·        Covers a large area like cities, countries, or worldwide.
·        High speed data transfer.	·        Slower speed compared to LAN.
·        Low cost to set up and maintain.	·        Expensive to set up and maintain.
·        Owned and managed by one organization.	·        Managed by multiple organizations or service providers (e.g., ISPs).