Chapter 5 - The Internet & Its Uses (IGCSE Computer Science)

What is internet security and why is it important?

• Internet security is not important and does not affect personal information

• Internet security is only important for businesses, not for individuals

• Internet security is only important for protecting against physical theft, not cyber attacks

• Internet security is important to protect personal and sensitive information, prevent cyber attacks, and ensure the privacy and safety of online activities.

Answer explanation

Internet security is important to protect personal and sensitive information, prevent cyber attacks, and ensure the privacy and safety of online activities.

Explain the concept of digital currency and provide an example.

• Ethereum

• Litecoin

• PayPal

• Bitcoin

Answer explanation

Digital currency is a form of currency that exists only in electronic form. It is decentralized and operates independently of a central bank. Bitcoin is an example of digital currency.

What is the difference between the internet and the World Wide Web (WWW)?

• The internet is the infrastructure that connects computers, while the World Wide Web is a system of interlinked documents accessed via the internet.

• The internet and the World Wide Web are two terms for the same thing.

• The internet is a type of software, while the World Wide Web is a type of hardware.

• The internet is only used for email, while the World Wide Web is used for browsing.

Answer explanation

The internet is the infrastructure that connects computers, while the World Wide Web is a system of interlinked documents accessed via the internet. This is the correct choice.

What are some common internet security threats and how can they be prevented?

• Be careless with phishing emails and websites, never use a firewall, and click on suspicious links and download unknown files.

• Keep software and antivirus programs outdated, use weak and common passwords, and click on every link and download every file.

• Use strong and unique passwords, keep software and antivirus programs updated, be cautious of phishing emails and websites, use a firewall, and avoid clicking on suspicious links or downloading unknown files.

• Use the same password for all accounts, never update software, and click on any link or download any file.

Answer explanation

To prevent internet security threats, use strong passwords, update software and antivirus programs, be cautious of phishing emails and websites, use a firewall, and avoid suspicious links or unknown file downloads.

How does digital currency work and what are its advantages and disadvantages?

• Digital currency works through blockchain technology and offers advantages such as lower transaction fees, increased security, and accessibility, but also has disadvantages such as price volatility and potential for illegal activities.

• Digital currency works through credit card technology and offers advantages such as easy traceability and stability, but also has disadvantages such as high transaction fees and lack of privacy.

• Digital currency works through barter system and offers advantages such as physical presence and limited accessibility, but also has disadvantages such as high transaction fees and lack of security.

• Digital currency works through traditional banking systems and offers advantages such as high transaction fees and lack of security, but also has disadvantages such as stability and legality issues.

Answer explanation

Digital currency works through blockchain technology, providing lower transaction fees, increased security, and accessibility. However, it also has disadvantages like price volatility and potential for illegal activities.

Describe the role of internet service providers (ISPs) in providing internet access.

• ISPs only provide internet access to businesses, not individuals

• ISPs connect users to the internet through various technologies.

• ISPs are responsible for creating the internet

• ISPs have no role in connecting users to the internet

Answer explanation

ISPs connect users to the internet through various technologies.

What are some common protocols used on the internet and what are their functions?

• GIF, JPEG, PNG, SVG

• TCP, UDP, IP, SSL

• HTTP, FTP, SMTP, DNS

• HTML, CSS, JavaScript, PHP

Answer explanation

HTTP, FTP, SMTP, and DNS are common protocols used on the internet. HTTP is used for web browsing, FTP for file transfer, SMTP for email, and DNS for domain name resolution.

Explain the concept of encryption and its importance in internet security.

• Encryption is the process of converting data into a code to prevent authorized access. It is important in internet security to make data more vulnerable to hackers.

• Encryption is the process of converting data into a physical form. It is important in internet security to make data more accessible to users.

• Encryption is the process of converting data into a code to prevent unauthorized access. It is important in internet security to protect sensitive information such as personal data, financial transactions, and communication from being intercepted or accessed by hackers.

• Encryption is the process of converting data into a code to make it easier to share. It is important in internet security to speed up data transfer.

Answer explanation

Encryption is the process of converting data into a code to prevent unauthorized access. It is important in internet security to protect sensitive information from being intercepted or accessed by hackers.

What are cookies and how are they used on the internet?

• Cookies are used to store user data and track their activity on the internet.

• Cookies are used to send physical snacks to internet users.

• Cookies are used to play music on the internet.

• Cookies are used to bake virtual pastries on the internet.

Answer explanation

Cookies are used to store user data and track their activity on the internet. This choice correctly describes the purpose of cookies.

Discuss the impact of the internet on society and the economy.

• The impact of the internet on society and the economy is minimal, as it has had little effect on communication, access to information, and business practices.

• The impact of the internet on society and the economy is irrelevant, as it has no bearing on communication, access to information, and business practices.

• The impact of the internet on society and the economy is significant, as it has revolutionized communication, access to information, and business practices.

• The impact of the internet on society and the economy is negative, as it has led to increased isolation, misinformation, and economic instability.

Answer explanation

The internet has significantly revolutionized communication, access to information, and business practices, making its impact on society and the economy significant.