Which statement is true regarding CIDR range?

Which statement is true regarding CIDR range?

• A. A smaller number after the / allows more addresses
• B. A larger number after the / allows more addresses
• C. The number after the / indicates total bandwidth
• D. Only even numbers are valid in CIDR notation

Answer: (A)

The statement that a smaller number after the slash (/) allows more addresses is accurate for CIDR (Classless Inter-Domain Routing) notation. In CIDR notation, the number that follows the slash indicates the subnet mask, which defines how many bits of the address are used for the network part and how many are available for the host part. When the number is smaller, it indicates that fewer bits are reserved for the network. This means more bits are left for the host addresses, hence allowing for a larger number of possible addresses within that subnet. For example, a CIDR notation of /24 reserves 24 bits for the network and allows for up to 256 addresses (2^(32-24)), while /16 reserves only 16 bits for the network and allows for up to 65,536 addresses (2^(32-16)). This concept of subnetting is crucial in efficiently utilizing IP address space and ensuring that networks can scale effectively without wasting resources.

The statement that a smaller number after the slash (/) allows more addresses is accurate for CIDR (Classless Inter-Domain Routing) notation. In CIDR notation, the number that follows the slash indicates the subnet mask, which defines how many bits of the address are used for the network part and how many are available for the host part.

When the number is smaller, it indicates that fewer bits are reserved for the network. This means more bits are left for the host addresses, hence allowing for a larger number of possible addresses within that subnet. For example, a CIDR notation of /24 reserves 24 bits for the network and allows for up to 256 addresses (2^(32-24)), while /16 reserves only 16 bits for the network and allows for up to 65,536 addresses (2^(32-16)).

This concept of subnetting is crucial in efficiently utilizing IP address space and ensuring that networks can scale effectively without wasting resources.