Understanding Digital Systems and Networks

What is the main job of an internet search spider?

• To protect computers from viruses

• To browse and index web pages for search engines

• To send emails to users

• To create websites for users

Answer explanation

The main job of an internet search spider is to browse and index web pages for search engines. This process helps search engines retrieve relevant information quickly when users perform searches.

Which of the following best describes a submarine cable?

• A cable used for television signals

• A cable that connects computers within a classroom

• A cable laid on the ocean floor to transmit internet data between continents

• A cable used to power submarines

Answer explanation

A submarine cable is specifically designed to be laid on the ocean floor, enabling the transmission of internet data between continents, making it essential for global connectivity.

What is a packet?

• A type of printer

• A type of computer virus

• A small unit of data sent across a network

• A physical box used to store data

Answer explanation

A packet is defined as a small unit of data sent across a network, making it essential for data transmission in networking. The other options do not accurately describe what a packet is.

Which of the following is NOT a typical component of a school network?

• Submarine cable

• Switch

• Router

• Server

Answer explanation

A submarine cable is used for long-distance communication between continents, not within a school network. Typical components of a school network include switches, routers, and servers.

How do data packets travel across the internet?

• By being split up and sent along different routes, then reassembled at the destination

• By being carried by people

• By following the same path every time

• In a straight line from sender to receiver

Answer explanation

Data packets travel across the internet by being split into smaller pieces, which can take different routes to the destination. Once they arrive, they are reassembled in the correct order, ensuring efficient and reliable communication.

Which device in a school network directs data to the correct device?

• Monitor

• Switch

• Printer

• Keyboard

Answer explanation

A switch is a networking device that connects devices within a network and directs data packets to the correct destination based on MAC addresses, ensuring efficient communication between devices.

What is the main purpose of a server in a school network?

• To display high-resolution images

• To store and manage files and resources for other computers

• To print documents

• To connect to the internet

Answer explanation

The main purpose of a server in a school network is to store and manage files and resources for other computers, enabling efficient access and collaboration among users.

Which of the following best explains how a search engine finds information on the internet?

• It only shows websites from its own company

• 
  It randomly selects websites

• It asks users to submit websites

• It uses search spiders to crawl and index web pages

Answer explanation

Search engines use search spiders, also known as web crawlers, to systematically browse the internet, discover, and index web pages. This allows them to provide relevant search results, unlike the other options listed.

What information does a data packet usually contain?

• Only the sender’s address

• Only the receiver’s address

• The sender’s address, receiver’s address, and the message content

• Only the message content

Answer explanation

A data packet typically contains the sender’s address, the receiver’s address, and the message content. This information is essential for routing the packet correctly and delivering the intended message.

Which of the following is an example of communication between components in a school network?

• A computer sending a file to a printer

• A teacher asking students to get their laptops

• A student writing on paper

• A student reading a book

Answer explanation

The correct choice, 'A computer sending a file to a printer', exemplifies communication between components in a school network, as it involves data transfer between devices. The other options do not involve such interaction.