Lesson 4.9.4.5

4.9.4.5 IP standards and public and private addresses Quiz: AQA Computer Science, Unit 9

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.9.4.5, IP standards and public and private addresses: 20 multiple choice questions for the AQA Computer Science (7517), Unit 9: Fundamentals of communication and networking, written with Revision Ninja.

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The 20 questions

  1. How many bits long is an IPv6 address?

    • 32
    • 128
    • 256
    • 64

  2. Which two IP standards are currently in use?

    • IPv4 and IPv6
    • IPv5 and IPv6
    • IPv4 and IPX
    • IPv1 and IPv2

  3. Why was IPv6 introduced?

    • IPv4 could not be used with Ethernet, so IPv6 was designed for wireless networks only and cannot be used on fixed cabled networks at all.
    • IPv4 could not carry email, so IPv6 was created to route SMTP traffic.
    • IPv4 was too slow to carry video, so IPv6 was designed for faster fibre cables.
    • The supply of IPv4 addresses was running out, and IPv6 provides a much larger address space.

  4. Roughly how many IPv4 addresses exist in total?

    • About 65,000, which is 2^16 addresses.
    • About 340 billion, which is 2^48 addresses.
    • About 18 quintillion, which is 2^64 addresses.
    • About 4.3 billion, which is 2^32 addresses.

  5. Which address range is a private range in IPv4?

    • 192.0.2.0 to 192.0.2.255
    • 172.32.0.0 to 172.32.255.255, which is a public range that is routed across the internet and is assigned by the regional registries.
    • 192.168.0.0 to 192.168.255.255
    • 8.8.0.0 to 8.8.255.255

  6. Which address range is the private class A block in IPv4?

    • 11.0.0.0 to 11.255.255.255
    • 126.0.0.0 to 126.255.255.255
    • 10.0.0.0 to 10.255.255.255
    • 12.0.0.0 to 12.255.255.255

  7. What does it mean for an IP address to be non-routable?

    • It has no host identifier, so routers ignore it on every network.
    • It can only be used by one computer and can never be assigned to a router.
    • It cannot be routed across the public internet and is used only inside a private network.
    • It is a broadcast address that every router must forward to all networks.

  8. Which address could be used as a private address inside a home network?

    • 8.8.8.8
    • 203.0.113.5
    • 172.32.0.1
    • 192.168.1.25

  9. Which address is a private address?

    • 172.32.1.5
    • 172.200.10.10
    • 172.20.1.5
    • 172.2.2.2

  10. Which IPv4 range is the private block for medium-sized networks in the 172 range?

    • 172.64.0.0 to 172.127.255.255
    • 172.16.0.0 to 172.31.255.255
    • 172.0.0.0 to 172.15.255.255
    • 172.32.0.0 to 172.63.255.255

  11. How are IPv6 addresses usually written?

    • As four decimal numbers from 0 to 255 separated by dots.
    • As 128 binary digits with no separators between them.
    • As 32 binary digits grouped into bytes separated by dots, with each byte written as a decimal number between 0 and 255.
    • As eight groups of four hexadecimal digits separated by colons.

  12. How many times more addresses does IPv6 provide than IPv4?

    • 2^32 times more
    • 128 times more
    • 2^96 times more
    • 2^64 times more

  13. A home network uses only private addresses, yet its devices reach the internet. Why are private addresses not sent directly across the internet?

    • They are reserved for email and cannot be used to carry web traffic, so browsers must always use a separate public address to load pages.
    • They are valid only on Ethernet cables and not on wireless networks.
    • They are too long for public routers to carry without being split.
    • They are non-routable on the public internet, so public routers would drop them.

  14. Evaluate: IPv6 has not fully replaced IPv4 despite its much larger address space. Which best explains why?

    • Many systems and networks still rely on IPv4, so running both protocols needs transition work.
    • IPv6 addresses are shorter, so routers prefer to forward IPv4 traffic.
    • IPv6 addresses are private and so cannot be used on the public internet.
    • IPv6 addresses cannot be used on any device made after 2005 onwards.

  15. Which statement about private IPv4 addresses is correct?

    • Routers on the public internet do not forward packets addressed to private addresses.
    • Routers on the public internet forward private packets to the nearest home network.
    • Each private address is globally unique across every organisation in the world.
    • Private addresses cannot be assigned to devices on a local area network.

  16. Why do 192.168.x.x addresses appear in so many home routers?

    • They identify the router manufacturer on the network.
    • They are reserved for IPv6 transition only and are never used by IPv4 devices.
    • They are reserved private addresses that can be reused by many separate networks.
    • They are the public addresses that an ISP assigns to each customer.

  17. A company has 300 devices and only one public IPv4 address. Which approach lets all devices reach the internet?

    • Give the devices private addresses and translate their traffic to the single public address.
    • Assign each device an IPv6 address and disable routing on the network.
    • Buy 300 separate subnets and give each one its own public address.
    • Give each device a public address taken from the 10.0.0.0 range.

  18. Which two addresses are both private?

    • 172.40.1.1 and 192.168.5.5
    • 1.1.1.1 and 172.16.4.4
    • 8.8.8.8 and 10.1.1.1
    • 10.1.1.1 and 192.168.0.5

  19. Why must IPv4 addresses be managed carefully by organisations?

    • IPv4 addresses can be used by only one organisation worldwide and never shared.
    • IPv4 addresses expire after one year and must be renewed each time.
    • The 32-bit space gives only about 4.3 billion addresses, so each public address is a scarce resource.
    • IPv4 addresses are stored in router memory, which is small and fills up quickly.

  20. Which of these is a valid IPv6 address?

    • 192.168.1.1
    • 2001:db8::1
    • AA-BB-CC-DD-EE-FF
    • 10.0.0.256

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