Subnetting Questions and Answers

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Q31
Which IP class supports subnetting by default
  • A Class A
  • B Class B
  • C Class C
  • D Explanation: Subnetting can be applied to all IP address classes.
Answer: Option D
Explanation: Subnetting can be applied to all IP address classes.
Q32
What is the total number of addresses in a /28 subnet
  • A 8
  • B 12
  • C 14
  • D Explanation: /28 has 4 host bits, giving 2⁴ = 16 addresses.
Answer: Option D
Explanation: /28 has 4 host bits, giving 2⁴ = 16 addresses.
Q33
Which subnet mask allows the maximum number of hosts
  • A /30
  • B /28
  • C /24
  • D Explanation: /16 leaves more host bits, allowing more hosts.
Answer: Option D
Explanation: /16 leaves more host bits, allowing more hosts.
Q34
What happens when you increase the subnet mask length
  • A Number of hosts increases
  • B Number of subnets decreases
  • C Explanation: Increasing the mask length reduces host bits.
  • D IP address size increases
Answer: Option C
Explanation: Increasing the mask length reduces host bits.
Q35
Which of the following is a valid private IP address
  • A 8.8.8.8
  • B Explanation: 172.16.0.0 to 172.31.255.255 is a private IP range.
  • C 200.10.5.1
  • D 1.1.1.1
Answer: Option B
Explanation: 172.16.0.0 to 172.31.255.255 is a private IP range.
Q36
What is VLSM used for
  • A Fixed-length subnetting
  • B Explanation: VLSM allows subnets of different sizes.
  • C Encrypting IP packets
  • D Address translation
Answer: Option B
Explanation: VLSM allows subnets of different sizes.
Q37
Which address represents the first usable host
  • A Network address
  • B Explanation: The first usable host is one more than the network address.
  • C Broadcast address
  • D Last address
Answer: Option B
Explanation: The first usable host is one more than the network address.
Q38
Which subnet mask is used for point-to-point links
  • A 255.255.255.0
  • B 255.255.255.128
  • C Explanation: /30 is commonly used for point-to-point links.
  • D 255.255.255.255
Answer: Option C
Explanation: /30 is commonly used for point-to-point links.
Q39
How many bits are in an IPv4 address
  • A 16
  • B Explanation: IPv4 addresses are 32 bits long.
  • C 64
  • D 128
Answer: Option B
Explanation: IPv4 addresses are 32 bits long.
Q40
Which of the following is a Class B default subnet mask
  • A 255.0.0.0
  • B Explanation: Class B networks use 255.255.0.0 as default.
  • C 255.255.255.0
  • D 255.255.255.252
Answer: Option B
Explanation: Class B networks use 255.255.0.0 as default.

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