The internet is a vast network of interconnected computers that communicate using standardised protocols. Data sent across the internet is broken into small packets, each labelled with its destination address, and routed independently — potentially via different paths — before being reassembled at the destination. The Domain Name System (DNS) translates human-readable website names (like example.com) into the numerical IP addresses computers actually use to find each other.
Example
When you type a website address into your browser, DNS first translates that name into an IP address, then your request is broken into packets and sent across multiple routers toward that address, with the response packets reassembled back into the webpage you see.
Key terms
Packet:
A small unit of data, labelled with a destination, sent across a network.
IP address:
A numerical address identifying a device on a network.
DNS (Domain Name System):
A system translating website names into IP addresses.
Questions
1. The internet is:
A vast network of interconnected computers
A single, standalone computer
A type of physical cable only, with no computers involved
A single company's private server only
2. Data sent across the internet is broken into:
Packets
A single, unbroken stream only
Nothing; data is never broken up
Physical letters only
3. An IP address:
Identifies a device on a network
Is a type of website design only
Has no connection to any device
Is only used for printing documents
4. DNS stands for:
Domain Name System
Digital Network Server
Data Network Storage
Direct Network Signal
5. DNS translates:
Website names into IP addresses
IP addresses into physical locations only
Nothing; it has no translation function
Only images, with no text involved
6. Packets are labelled with:
Their destination
No information at all
Only a random colour code
A physical stamp only
7. Packets travelling across the internet:
Can take different paths before being reassembled
Must always travel the exact same single path
Never reach their destination
Are reassembled before ever being sent
8. Why might breaking data into packets, rather than sending it as one continuous stream, make internet communication more reliable?
If one packet is lost or delayed, only that piece needs to be resent, rather than the entire transmission
Breaking data into packets always makes transmission slower and less reliable
Packets have no impact on the reliability of data transmission
Data can only ever be sent as a single, unbroken stream
9. Why is DNS necessary, given that computers actually communicate using numerical IP addresses?
It allows humans to use memorable names instead of having to remember complex numerical addresses
Humans always prefer to type numerical IP addresses directly
DNS has no practical function for everyday internet use
IP addresses and website names are always identical to each other
10. Why might packets from the same webpage request take different physical routes to reach their destination?
Routing decisions can be made independently for each packet based on current network conditions
All packets from a single request are always forced to take an identical path
Packets are never routed independently of one another
Network conditions have no influence on how packets are routed
11. A router's role in a network is to:
Direct packets toward their destination
Permanently delete all incoming packets
Only display webpages, with no data handling
Prevent any data from ever being transmitted
12. Why might a website become temporarily unreachable if its DNS records are misconfigured, even if its server is working correctly?
Without correct DNS translation, browsers cannot find the correct IP address to connect to
DNS configuration has no effect on whether a website can be reached
A working server always guarantees a website is reachable regardless of DNS
DNS records only affect emails, never websites
13. Why is the internet described as resilient to certain failures, given its packet-based, decentralised structure?
If one route or connection point fails, packets can often be rerouted through alternative paths to reach their destination
A single failure anywhere on the internet always causes the entire internet to stop working
The internet has no alternative paths or routing options available at all
Packet-based structure makes the internet more fragile, not more resilient
14. Why might internet protocols (agreed standard rules for communication) be essential for the global internet to function?
Standardised protocols let vastly different devices and networks around the world understand and exchange data consistently
Devices on the internet never need to follow any shared, standardised rules
Protocols only matter for a single country's internet, not the global internet
Communication between different devices is always possible with no shared standard
15. Why might a Content Delivery Network (CDN), which stores copies of website data in multiple locations worldwide, improve loading speed for users?
Data can be served from a location physically closer to the user, reducing the distance packets need to travel
CDNs always increase the distance data must travel to reach a user
Physical distance has no effect on the time it takes data to travel across a network
CDNs have no real impact on internet performance for any user
16. Why might understanding how the internet is structured help someone better evaluate claims about internet outages or censorship?
It clarifies whether an issue is likely due to routing, DNS, a single server, or broader infrastructure, rather than assuming one single cause
Internet structure has no bearing on understanding outages or censorship at all
All internet outages always have the exact same single cause
This kind of technical understanding provides no practical benefit to anyone
17. A device's IP address is generally considered:
A unique identifier used to locate it on a network
Completely unrelated to how it is found on a network
The same for every single device in the world
Only relevant to printers, not computers
18. If a website's DNS record points to the wrong IP address, a visitor typing the correct domain name would most likely:
Be directed to the wrong location or receive an error
Always reach the correct website regardless of the DNS error
Have no possible way of ever encountering an error
Automatically have the DNS error fixed by their browser
19. Why might large tech companies operate multiple data centres in different geographic regions rather than just one central location?
It reduces the physical distance data must travel to reach users in different regions, improving speed and reliability
A single centralised data centre is always faster for every user worldwide
Geographic distance has no effect on network performance
Multiple data centres are used only for reasons unrelated to network performance
20. Why is it inaccurate to think of the internet as one single physical object, like a giant cloud?
It is actually made up of countless individual computers, cables and routers physically connected across the world
The internet genuinely exists as a single, literal cloud in the sky
The internet has no physical infrastructure supporting it at all
A "cloud" is technically the most accurate physical description of the internet
21. Why might undersea fibre optic cables be considered critical infrastructure for global internet connectivity?
A large share of international internet traffic physically travels through these cables connecting continents
International internet traffic never actually relies on any physical cables
Undersea cables have no real function in how the global internet operates
All internet traffic between continents travels exclusively via satellite
Answer key (parent copy)
1. A vast network of interconnected computers
2. Packets
3. Identifies a device on a network
4. Domain Name System
5. Website names into IP addresses
6. Their destination
7. Can take different paths before being reassembled
8. If one packet is lost or delayed, only that piece needs to be resent, rather than the entire transmission
9. It allows humans to use memorable names instead of having to remember complex numerical addresses
10. Routing decisions can be made independently for each packet based on current network conditions
11. Direct packets toward their destination
12. Without correct DNS translation, browsers cannot find the correct IP address to connect to
13. If one route or connection point fails, packets can often be rerouted through alternative paths to reach their destination
14. Standardised protocols let vastly different devices and networks around the world understand and exchange data consistently
15. Data can be served from a location physically closer to the user, reducing the distance packets need to travel
16. It clarifies whether an issue is likely due to routing, DNS, a single server, or broader infrastructure, rather than assuming one single cause
17. A unique identifier used to locate it on a network
18. Be directed to the wrong location or receive an error
19. It reduces the physical distance data must travel to reach users in different regions, improving speed and reliability
20. It is actually made up of countless individual computers, cables and routers physically connected across the world
21. A large share of international internet traffic physically travels through these cables connecting continents