Vaidikalaya

MCQ On Subnetting

Q1. What is the main purpose of subnetting?.
  1. Increase broadcast domain size
  2. Divide a network into smaller networks
  3. Increase IP address wastage
  4. Combine networks into one

Answer: b, Divide a network into smaller networks

Solution: Subnetting divides a large network into smaller ones.

Q2. What is the subnet mask for a /26 network?.
  1. 255.255.255.0
  2. 255.255.255.128
  3. 255.255.255.192
  4. 255.255.255.224

Answer: c, 255.255.255.192

Solution: /26 corresponds to 255.255.255.192.

Q3. A /27 network provides how many usable hosts?.
  1. 32
  2. 30
  3. 14
  4. 62

Answer: b, 30

Solution: /27 gives 32 addresses ? 30 usable.

Q4. Which of the following is the broadcast address of 192.168.1.64/26?.
  1. 192.168.1.126
  2. 192.168.1.127
  3. 192.168.1.63
  4. 192.168.1.95

Answer: d, 192.168.1.95

Solution: /26 block size 64 ? broadcast = 127.

Q5. What is the network address of 10.0.5.123/16?.
  1. 10.0.0.0
  2. 10.0.5.0
  3. 10.0.255.0
  4. 10.0.1.0

Answer: a, 10.0.0.0

Solution: /16 means first 16 bits are network ? 10.0.0.0.

Q6. In subnetting, borrowing more bits from host portion results in:.
  1. More hosts per subnet
  2. Fewer subnets
  3. More subnets but fewer hosts
  4. No change

Answer: c, More subnets but fewer hosts

Solution: More network bits ? more subnets, fewer hosts.

Q7. What is the block size for a /28 subnet?.
  1. 4
  2. 8
  3. 16
  4. 32

Answer: c, 16

Solution: /28 ? 4 host bits ? block size 16.

Q8. A company needs 50 hosts. Which subnet mask fits best?.
  1. /24
  2. /27
  3. /26
  4. /25

Answer: c, /26

Solution: /26 provides 62 usable hosts.

Q9. What is the usable host range of 172.16.10.0/24?.
  1. 172.16.10.0 – 172.16.10.255
  2. 172.16.10.1 – 172.16.10.254
  3. 172.16.10.1 – 172.16.10.253
  4. 172.16.10.2 – 172.16.10.254

Answer: b, 172.16.10.1 – 172.16.10.254

Solution: First is network, last is broadcast.

Q10. What does the /23 subnet mask represent?.
  1. Two Class C networks combined
  2. One Class B network
  3. Same as /24
  4. Same as /22

Answer: a, Two Class C networks combined

Solution: /23 merges two /24 networks.

Q11. How many subnets does a /26 create from a /24?.
  1. 2
  2. 4
  3. 8
  4. 16

Answer: b, 4

Solution: Borrowing 2 bits ? 2² = 4 subnets.

Q12. What is the first valid host in the 192.168.10.32/27 subnet?.
  1. 192.168.10.32
  2. 192.168.10.33
  3. 192.168.10.34
  4. 192.168.10.31

Answer: b, 192.168.10.33

Solution: First host = network + 1.

Q13. How many host bits remain in a /29 network?.
  1. 3
  2. 5
  3. 2
  4. 7

Answer: a, 3

Solution: /29 ? 3 host bits.

Q14. Which of the following masks supports 510 usable hosts?.
  1. /23
  2. /22
  3. /24
  4. /16

Answer: b, /22

Solution: /22 supports 1022 usable hosts ? enough for 510.

Q15. If a network is 200.10.20.0/25, what is the 2nd subnet?.
  1. 200.10.20.0
  2. 200.10.20.64
  3. 200.10.20.128
  4. 200.10.20.192

Answer: c, 200.10.20.128

Solution: /25 divides into blocks of 128 ? 0 & 128.