Subnetting

Question 1

What is the default subnet mask for a Class A network?

Answer 1

255.0.0.0

Question 2

What is the default subnet mask for a Class B network?

Answer 2

255.255.0.0

Question 3

What is the default subnet mask for a Class C network?

Answer 3

255.255.255.0

Question 4

How many usable host addresses are in a /24 subnet?

Answer 4

254

Question 5

How many usable host addresses are in a /30 subnet?

Answer 5

2

Question 6

How many usable host addresses are in a /29 subnet?

Answer 6

6

Question 7

What is the subnet mask for a /27 network?

Answer 7

255.255.255.224

Question 8

What is the subnet mask for a /26 network?

Answer 8

255.255.255.192

Question 9

What is the CIDR notation for a subnet mask of 255.255.255.248?

Answer 9

/29

Question 10

What is the CIDR notation for a subnet mask of 255.255.255.240?

Answer 10

/28

Question 11

What is the subnet mask for a /22 network?

Answer 11

255.255.252.0

Question 12

How many subnets are created when subnetting a /24 network into /26 subnets?

Answer 12

4

Question 13

What is the formula to calculate the number of subnetted networks?

Answer 13

2^borrowed bits

Question 14

What is the formula to calculate the number of usable hosts per subnet?

Answer 14

(2^host bits) - 2

Question 15

How many host bits are available in a /23 subnet?

Answer 15

9

Question 16

What is the block size of a /26 subnet?

Answer 16

64

Question 17

What is the block size of a /27 subnet?

Answer 17

32

Question 18

What is the first valid subnet in a /26 subnetted network starting from 192.168.1.0?

Answer 18

192.168.1.64

Question 19

What is the last valid host in the 192.168.1.64/26 subnet?

Answer 19

192.168.1.126

Question 20

What is the broadcast address for the 192.168.1.64/26 subnet?

Answer 20

192.168.1.127

Question 21

If a network is divided into /28 subnets, how many subnets are created?

Answer 21

16

Question 22

If a network is divided into /28 subnets, how many usable hosts per subnet?

Answer 22

14

Question 23

What is the purpose of a subnet mask?

Answer 23

To determine the network and host portions of an IP address

Question 24

How many total IP addresses exist in a /30 subnet?

Answer 24

4

Question 25

What is the first valid host address in the 10.0.0.0/8 network?

Answer 25

10.0.0.1

Question 26

What is the last valid host address in the 10.0.0.0/8 network?

Answer 26

10.255.255.254

Question 27

What is the network address of the 172.16.20.33/28 subnet?

Answer 27

172.16.20.32

Question 28

What is the broadcast address of the 172.16.20.33/28 subnet?

Answer 28

172.16.20.47

Question 29

What is the first valid host in the 172.16.20.33/28 subnet?

Answer 29

172.16.20.33

Question 30

What is the last valid host in the 172.16.20.33/28 subnet?

Answer 30

172.16.20.46

Question 31

How do you determine the subnet mask when given a CIDR notation?

Answer 31

Convert the number of bits to a decimal mask (e.g., /26 = 255.255.255.192)

Question 32

What is the smallest subnet that supports 500 hosts?

Answer 32

/23 (Supports 510 hosts)

Question 33

What is the smallest subnet that supports 1000 hosts?

Answer 33

/22 (Supports 1022 hosts)

Question 34

What is the subnet mask for a /21 network?

Answer 34

255.255.248.0

Question 35

If a network is divided into /25 subnets, how many usable hosts per subnet?

Answer 35

126

Question 36

What subnet does the IP 192.168.10.200/26 belong to?

Answer 36

192.168.10.192

Question 37

What is the default gateway for the 192.168.1.64/26 subnet?

Answer 37

192.168.1.65 (First usable IP)

Question 38

What is the range of valid host addresses in the 10.10.10.0/27 subnet?

Answer 38

10.10.10.1 - 10.10.10.30

Question 39

What does a subnet mask of 255.255.255.252 indicate?

Answer 39

A /30 network with 2 usable hosts

Question 40

What subnet does the IP 192.168.1.135/27 belong to?

Answer 40

192.168.1.128