4.9.4.3 IP address structure and subnet masking Quiz: AQA Computer Science, Unit 9

The 20 questions

1. Which two parts make up the structure of an IP address?

   • Network and host
   • MAC and port
   • Gateway and DNS
   • Domain and subnet

2. How many bits does an IPv4 address contain?

   • 128
   • 16
   • 64
   • 32

3. What does the network identifier part of an IP address specify?

   • The router port
   • The domain name
   • The network location
   • The individual device

4. What is the primary function of an IPv4 subnet mask?

   • Encrypt data packets
   • Assign IP addresses
   • Identify network bits
   • Translate domain names

5. In a binary subnet mask, what do bits set to 1 represent?

   • Broadcast address
   • Network identifier
   • Subnet gateway
   • Host identifier

6. What is the network address for 192.168.1.37 with subnet mask 255.255.255.0?

   • 192.168.1.37
   • 192.168.1.255
   • 192.168.0.0
   • 192.168.1.0

7. What is the network address for 10.20.30.40 with subnet mask 255.0.0.0?

   • 10.20.0.0
   • 10.20.30.0
   • 40.0.0.0
   • 10.0.0.0

8. What is the network address for 172.16.5.9 with subnet mask 255.255.0.0?

   • 172.16.5.9
   • 172.0.0.0
   • 172.16.0.0
   • 172.16.5.0

9. How many usable host addresses are there in a subnet with mask 255.255.255.0?

   • 256
   • 255
   • 252
   • 254

10. How many usable host addresses are there in a subnet with mask 255.255.255.192?

    • 60
    • 30
    • 64
    • 62

11. What device is needed for 192.168.1.5 and 192.168.2.5 to communicate with mask 255.255.255.0?

    • Router
    • Switch
    • Hub
    • Repeater

12. Which of these is a valid IPv4 subnet mask?

    • 255.255.255.0
    • 255.255.0.255
    • 255.0.255.0
    • 255.255.255.256

13. A host has IP address 192.168.10.200 and mask 255.255.255.240. What is its network address?

    • 192.168.10.200
    • 192.168.10.192
    • 192.168.10.0
    • 192.168.10.128

14. A network needs at least 50 host addresses. Which subnet mask gives the smallest suitable subnet?

    • 255.255.255.224
    • 255.255.255.192
    • 255.255.255.240
    • 255.255.255.128

15. Host 10.1.2.3 uses mask 255.255.0.0. Which of these addresses is on the same subnet?

    • 11.1.2.3
    • 10.2.2.3
    • 10.1.200.9
    • 10.0.2.3

16. What key advantage does subnetting bring to a large network?

    • Replaces physical switches
    • Reduces broadcast traffic
    • Eliminates dynamic IPs
    • Increases cable speed

17. Which part of an IP address do routers inspect to route packets?

    • Port number
    • MAC address
    • Network identifier
    • Host identifier

18. What is the broadcast address for the network 192.168.1.0 with mask 255.255.255.0?

    • 192.168.1.0
    • 192.168.0.255
    • 192.168.1.255
    • 192.168.1.254

19. How many usable host addresses are provided by a /29 subnet mask?

    • 2
    • 5
    • 8
    • 6

20. A subnet mask of 255.255.255.128 is applied to 200.100.50.25. What is the network address?

    • 200.100.50.128
    • 200.100.50.25
    • 200.100.0.0
    • 200.100.50.0

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