IGCSE Computer Science - Internet and Its Uses (Chapter 5))

a set of rules that must be obeyed when transferring files across the internet

In the following option, what are some of the features that most web browsers have?

• they have a home page

• they have the ability to allow the user to navigate forwards and backwards through websites/web pages already opened

• they make use of cookies

• data is stored as a cache

• make use of JavaScript

Which of these statements accurately shows how a web page can be located and then sent back to the user’s computer?

• 1. The DNS server (1) finds the URL and map it to an IP address; the IP address is sent to the DNS server (2) which now puts this IP address and associated URL into its cache/database.

  2. The corresponding IP address is then sent back to the user’s computer

  3. The computer now sets up communication with the website server and the required pages are downloaded. HTML files are sent from the website server to the computer. The browser interprets the HTML, which is used to structure content, and then displays the information on the user’s computer.

  4. The user again opens their browser and types in the URL and the browser asks the DNS server (1) for the IP address of the website

  5. If DNS server can’t find the URL in its database or its cache, so it sends out a request to a DNS server (2). The cycle repeats until an error is detected

• 1. The user opens their browser and types in the URL and the browser asks the DNS server (1) for the IP address of the website

  2. In this case, let’s assume the DNS server can’t find the URL in its database or its cache, so it sends out a request to a DNS server (2).

  3. The DNS server (2) finds the URL and can map it to an IP address; the IP address is sent back to the DNS server (1) which now puts this IP address and associated URL into its cache/database.

  4. The computer now sets up communication with the website server and the required pages are downloaded. HTML files are sent from the website server to the computer. The browser interprets the HTML, which is used to structure content, and then displays the information on the user’s computer.

  5. The corresponding IP address is then sent back to the user’s computer.

• 1. The DNS server (1) finds the URL and map it to an IP address; the IP address is sent to the DNS server (2) which now puts this IP address and associated URL into its cache/database.

  2. The corresponding IP address is then sent back to the user’s computer

  3. The computer now sets up communication with the website server and the required pages are downloaded. HTML files are sent from the website server to the computer. The browser interprets the HTML, which is used to structure content, and then displays the information on the user’s computer.

  4. The user again opens their browser and types in the URL and the browser asks the DNS server (1) for the IP address of the website

  5. If DNS server can’t find the URL in its database or its cache, so it sends out a request to a DNS server (2). The cycle repeats until an error is detected

• 1. The user opens their browser and types in the URL and the browser asks the DNS server (1) for the IP address of the website

  2. In this case, let’s assume the DNS server can’t find the URL in its database or its cache, so it sends out a request to a DNS server (2).

  3. The DNS server (2) finds the URL and can map it to an IP address; the IP address is sent back to the DNS server (1) which now puts this IP address and associated URL into its cache/database.

  4. The corresponding IP address is then sent back to the user’s computer.

  5. The computer now sets up communication with the website server and the required pages are downloaded. HTML files are sent from the website server to the computer. The browser interprets the HTML, which is used to structure content, and then displays the information on the user’s computer.

Select the all accurate types of cookies

• session cookie

• permanent cookie

• persistent cookie

• cypher cookie

Digital currency exists purely in a __________ format.

What system does digital currency rely on?

The problem with centralization is maintaining _________

• confidentiality

• permanence

• insurance

• security

The website address contains

• country code

• domain type

• domain host

• country address code

• domain name

What does URL stands for? 

Finding IP addresses for a domain name given in a URL is the role of _____ (hint: a system)