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In CIDR notation, what does /24 represent?

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Question: In CIDR notation, what does /24 represent?

Options:

  1. 255.255.255.0 subnet mask
  2. 256 IP addresses
  3. 24 hosts per subnet
  4. 24 bits for the host portion

Correct Answer: 255.255.255.0 subnet mask

Solution: 

CIDR notation /24 indicates that the first 24 bits of the subnet mask are set to 1, which corresponds to a subnet mask of 255.255.255.0.

In CIDR notation, what does /24 represent?

Practice Questions

Q1
In CIDR notation, what does /24 represent?
  1. 255.255.255.0 subnet mask
  2. 256 IP addresses
  3. 24 hosts per subnet
  4. 24 bits for the host portion

Questions & Step-by-Step Solutions

In CIDR notation, what does /24 represent?
  • Step 1: Understand that CIDR stands for Classless Inter-Domain Routing, which is a way to represent IP addresses and their associated network masks.
  • Step 2: Recognize that the notation /24 means that the first 24 bits of the subnet mask are set to 1.
  • Step 3: Know that a subnet mask is a 32-bit number that divides the IP address into the network and host parts.
  • Step 4: Convert the /24 notation into binary: the first 24 bits are 1s (11111111.11111111.11111111.00000000).
  • Step 5: Convert the binary subnet mask into decimal: 11111111 in binary is 255, so the subnet mask is 255.255.255.0.
  • Step 6: Conclude that /24 indicates a subnet mask of 255.255.255.0.
  • CIDR Notation – CIDR (Classless Inter-Domain Routing) notation is a method for allocating IP addresses and IP routing that uses a suffix to indicate the number of bits in the subnet mask.
  • Subnet Mask – A subnet mask is a 32-bit number that divides an IP address into network and host portions, determining which part of the address refers to the network and which part refers to the host.
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