IP Subnetting Quiz

Practice your IP subnetting with this 50-question exam.

IP subnetting is allocated around 10% of your final marks for exams such as the Cisco CCNA and CompTIA Network+, so you need to know it well.

We teach IP Subnetting from scratch in our Amazon best-selling book – IP Subnetting – Zero to Guru.

1. Which of the following are valid Network IDs?

200.221.224.255/22

70.9.80.64/26

121.21.3.0/30

192.168.10.128/25

Question 1 of 50

2. Match the addresses for a 192.168.10.64/26 network to their usage

Network ID	192.168.10.126 Unselect 192.168.10.64 Unselect 192.168.10.65 Unselect 192.168.10.127 Unselect 192.168.10.128 Unselect
Broadcast ID	192.168.10.126 Unselect 192.168.10.64 Unselect 192.168.10.65 Unselect 192.168.10.127 Unselect 192.168.10.128 Unselect
Valid Host	192.168.10.126 Unselect 192.168.10.64 Unselect 192.168.10.65 Unselect 192.168.10.127 Unselect 192.168.10.128 Unselect
Invalid Host	192.168.10.126 Unselect 192.168.10.64 Unselect 192.168.10.65 Unselect 192.168.10.127 Unselect 192.168.10.128 Unselect
Valid Host	192.168.10.126 Unselect 192.168.10.64 Unselect 192.168.10.65 Unselect 192.168.10.127 Unselect 192.168.10.128 Unselect

Question 2 of 50

3. Which subnet mask would support 30 networks from 171.16.0.0/17?

255.255.255.0

255.255.248.0

255.255.252.0

255.255.128.0

Question 3 of 50

4. Which of the following are valid subnet masks?

255.128.0.0

255.255.255.252

255.255.255.255

255.128.0.255

Question 4 of 50

5. Match the subnet bits to the subnet mask

/30	255.255.255.240 Unselect 255.255.254.0 Unselect 255.255.255.252 Unselect 255.255.248.0 Unselect
/28	255.255.255.240 Unselect 255.255.254.0 Unselect 255.255.255.252 Unselect 255.255.248.0 Unselect
/23	255.255.255.240 Unselect 255.255.254.0 Unselect 255.255.255.252 Unselect 255.255.248.0 Unselect
/21	255.255.255.240 Unselect 255.255.254.0 Unselect 255.255.255.252 Unselect 255.255.248.0 Unselect

Question 5 of 50

6. In which class would the IP address 141.10.99.3 fall?

Class A

Class C

Class B

Class D

Question 6 of 50

7. Match the Class name with its default subnet mask

Class A	255.255.255.0 Unselect 255.255.0.0 Unselect Does not have any subnet mask Unselect 255.0.0.0 Unselect
Class B	255.255.255.0 Unselect 255.255.0.0 Unselect Does not have any subnet mask Unselect 255.0.0.0 Unselect
Class C	255.255.255.0 Unselect 255.255.0.0 Unselect Does not have any subnet mask Unselect 255.0.0.0 Unselect
Class D	255.255.255.0 Unselect 255.255.0.0 Unselect Does not have any subnet mask Unselect 255.0.0.0 Unselect

Question 7 of 50

8. If there are 5 host bits available, how many usable hosts can you accommodate?

Question 8 of 50

9. Match the Class name with its address range

Class A	192.0.0.0 - 223.255.255.255 Unselect 128.0.0.0 - 191.255.255.255 Unselect 1.0.0.0 - 126.255.255.255 Unselect 224.0.0.0 - 239.255.255.255 Unselect 240.0.0.0 - 255.255.255.254 Unselect
Class B	192.0.0.0 - 223.255.255.255 Unselect 128.0.0.0 - 191.255.255.255 Unselect 1.0.0.0 - 126.255.255.255 Unselect 224.0.0.0 - 239.255.255.255 Unselect 240.0.0.0 - 255.255.255.254 Unselect
Class C	192.0.0.0 - 223.255.255.255 Unselect 128.0.0.0 - 191.255.255.255 Unselect 1.0.0.0 - 126.255.255.255 Unselect 224.0.0.0 - 239.255.255.255 Unselect 240.0.0.0 - 255.255.255.254 Unselect
Class D	192.0.0.0 - 223.255.255.255 Unselect 128.0.0.0 - 191.255.255.255 Unselect 1.0.0.0 - 126.255.255.255 Unselect 224.0.0.0 - 239.255.255.255 Unselect 240.0.0.0 - 255.255.255.254 Unselect
Class E	192.0.0.0 - 223.255.255.255 Unselect 128.0.0.0 - 191.255.255.255 Unselect 1.0.0.0 - 126.255.255.255 Unselect 224.0.0.0 - 239.255.255.255 Unselect 240.0.0.0 - 255.255.255.254 Unselect

Question 9 of 50

10. How many subnets can be created by the subnet mask 255.255.255.224?

Question 10 of 50

11. You work as a network administrator in a company and have been asked to create subnets capable of hosting approximately 500 hosts. Which subnet mask you would use?

255.255.254.0

255.255.0.0

255.255.255.0

255.255.255.128

Question 11 of 50

12. Which of the following statements are true about subnetting?

Each subnet requires a separate switch

Provides logical divisions within a network

Traffic is restricted with in the network

All of the above

Question 12 of 50

13. If the dotted decimal is 255.255.0.0, what is the correct Classless Inter-domain Routing (CIDR) notation?

/32

/16

/24

Question 13 of 50

14. How many IP addresses you will get when using CIDR notation /32?

Question 14 of 50

15. How many bits are in the host ID of an IP address after subnetting a class C network into 8 subnets?

Question 15 of 50

16. What is the next valid assignable IP address after 171.168.10.254 if the subnet mask is 255.255.240.0?

171.168.15.255

171.168.15.256

171.168.16.1

171.168.16.0

Question 16 of 50

17. The number of networks increases and hosts per subnet decreases when subnet bits are borrowed

True

False

Question 17 of 50

18. Which binary value represents the decimal value of 224?

11100000

11000000

11100001

10100000

Question 18 of 50

19. What is the range of usable addresses for the first subnet created by using the subnet mask of 255.255.255.128 in the 172.16.0.0 class B network?

172.16.0.1 - 172.16.0.126

172.16.0.0 - 172.16.0.127

172.16.0.1 - 172.16.0.127

172.16.0.129 - 172.16.0.254

Question 19 of 50

20. The address will always have 255 in the first octet and mask will never have 255 in the first octet

True

False

Question 20 of 50

21. How many bits and octets are there in an IP address?

Four 8-bit octets give a total of 32 bits

Four 6-bit octets give a total of 24 bits

Six 8-bit octets give a total of 48 bits

Four 8-bit octets give a total of 30 bits

Question 21 of 50

22. A laptop with an IP address of 172.16.10.54 and a subnet mask of 255.255.255.128 is on the same network with which of the following IP address?

172.16.10.129

172.16.10.125

172.16.10.253

172.16.10.127

Question 22 of 50

23. Which of the following IP addresses is reserved for internal loopback functions?

1.0.0.127

127.0.0.1

1.127.0.0

127.0.0.0

Question 23 of 50

24. You have changed the subnet mask from 255.255.255.0 to 255.255.255.240. How many bits were borrowed and how many networks were created due to this change?

16 bits, 4 networks

2 bits, 32 networks

4 bits, 16 networks

4 bits, 64 networks

Question 24 of 50

25. When dividing the Class C network 192.168.10.0 into 4 separate networks, what are the ranges of usable host IP addresses from the following?

192.168.10.1 - 192.168.10.62

192.168.10.192 - 192.168.10.255

192.168.10.129 - 192.168.10.190

192.168.10.0 - 192.168.10.63

Question 25 of 50

26. Any system that uses a public IP address cannot route its packets out to the Internet

True

False

Question 26 of 50

27. Match the IP address class to its characteristic

Class A	Uses 8 bits for the network ID and 24 bits for the host ID Unselect It provides 254 addresses Unselect Used for multicast applications Unselect The value of the first octet ranges from 128 to 191 Unselect
Class B	Uses 8 bits for the network ID and 24 bits for the host ID Unselect It provides 254 addresses Unselect Used for multicast applications Unselect The value of the first octet ranges from 128 to 191 Unselect
Class C	Uses 8 bits for the network ID and 24 bits for the host ID Unselect It provides 254 addresses Unselect Used for multicast applications Unselect The value of the first octet ranges from 128 to 191 Unselect
Class D	Uses 8 bits for the network ID and 24 bits for the host ID Unselect It provides 254 addresses Unselect Used for multicast applications Unselect The value of the first octet ranges from 128 to 191 Unselect

Question 27 of 50

28. Which subnet mask can be used in class A networks to make them the size of a class B network?

255.255.0.0

255.255.255.0

255.0.0.0

0.0.255.255

Question 28 of 50

29. Which of the following statements are not true about IP addresses?

An IP address is 48 bits long

IP addresses are composed of a four 16-bit octets

IP addresses are written in decimal format

All IP addresses are routable on the internet

Question 29 of 50

30. The subnet mask divides an IP address into a network portion and a host portion

True

False

Question 30 of 50

31. What is the binary equivalent of IP address 172.16.40.1?

10101100.00010000.00111000.00000001

10101100.00010000.00101000.00000001

10101100.00100000.00101000.00000001

10101000.00010000.00101000.00000001

Question 31 of 50

32. You have two directly connected router as shown below

ntptopo

Ensuring the efficient use of the address space, which CIDR notation you would use for the connection between the two routers?

/30

/24

/32

/28

Question 32 of 50

33. You need to subnet a Class C network and create 16 subnetworks. How many bits do you need to borrow?

Question 33 of 50

34. Given the IP address of 172.16.20.141 255.255.255.128. What is the subnet address?

172.16.20.128/26

172.16.20.0/25

172.16.20.128/25

172.16.20.64/26

Question 34 of 50

35. You work as a network administrator in a company. You have been given a network address 172.20.0.0. The requirement is to design a classful addressing scheme for three subnets with 50, 60 and 100 hosts. What subnet mask would accommodate this network?

255.255.255.128

255.255.255.192

255.255.255.224

255.255.255.240

Question 35 of 50

36. Which of the following statements describe the IP address 172.16.20.32/27?

The broadcast address of the subnet is 172.16.20.63

The broadcast address of the subnet is 172.16.20.32

Maximum number of usable hosts are 30

Maximum number of usable hosts are 60

Question 36 of 50

37. You have been assigned 192.168.10.0 subnet with the CIDR notation /26. Which of the following addresses cannot be assigned to hosts with in the same subnet?

192.168.10.63

192.168.10.127

192.168.10.62

192.168.10.64

Question 37 of 50

38. You have configured an IP address 172.29.113.1/20 under a DHCP scope. What is the maximum number of hosts allowed on this subnet?

512

1024

2046

4094

Question 38 of 50

39. Which of the following must be determined to find the valid range of addresses in a subnet?

Network ID

MAC address

Broadcast address

DHCP server address

Question 39 of 50

40. The first address of each subnet is the network ID, and it cannot be used as a host address

True

False

Question 40 of 50

41. If you use three bits of the host ID for subnetting, how many subnets can be created?

Question 41 of 50

42. Following formula can be used to determine the number of hosts returned by the mask
2^n -2 = X

What does n and X represents in the above formula?

n represents the number of host bits

X represents the number of hosts supported

n represents the number of subnet bits

X represents the number of subnets supported

Question 42 of 50

43. In which of the following networks does the address 192.168.10.131/25 reside?

192.168.10.128

192.168.10.0

192.168.10.127

192.168.10.255

Question 43 of 50

44. When a class C address such as 192.168.1.0 is subnetted with the subnet mask 255.255.255.192, what would be the interval between the network IDs of the resulting subnets?

128

Question 44 of 50

45. Which network address and subnet mask will allow two file servers to be on the same network and provide the highest number of subnets?

192.168.10.252/30

192.168.10.248/29

192.168.10.240/28

192.168.10.224/27

Question 45 of 50

46. Which subnet mask would be appropriate to cater for four networks, with each network containing 10 to 60 hosts?

255.255.255.224

255.255.255.192

255.255.255.240

255.255.255.248

Question 46 of 50

47. Which of the following is known as the 'Magic number', used to find the subnet interval?

255

256

248

Question 47 of 50

48. The number in the CIDR notation determine the host component of an IP address

True

False

Question 48 of 50

49. Which of the following is a way to determine the broadcast address of the subnet?

Subtract the last octet from 256

Subtract one from the value of the next subnet ID

There is no shortcut to finding it

Add one from the value of the next subnet ID

Question 49 of 50

50. In a broadcast address, the network ID bits of the IP address are all binary ones

True

False

Question 50 of 50

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