Question

The CIDR notation of /16 can also be represent as what subnet mask in decimal notation?

A. /16 255.255.0.0

B. /15 255.254.0.0

C. /14 255.252.0.0

D ./13 255.248.0.0

Answer 1

The CIDR notation /16 corresponds to the subnet mask 255.255.0.0 in decimal form. The 16 indicates that the first two octets of the address are made up of only '1's in binary, translating to 255.255 in decimal. The correct answer is A.

Step-by-step explanation:

The CIDR notation /16 can also be represented as the subnet mask 255.255.0.0 in decimal notation. In CIDR notation, the number after the slash represents the number of consecutive 1's in the subnet mask when converted to binary form. A /16 therefore translates to 16 1's, or 11111111.11111111 followed by 0's for the remaining bits, making it 255.255.0.0 when translated back into decimal form since each block of eight 1's converts to the decimal 255.

To further illustrate, here is how the conversion works with a /16 mask:

• Binary: 11111111.11111111.00000000.00000000
• Decimal: 255.255.0.0

Therefore, the answer to the question is option A: /16 255.255.0.0.