CompTIA Network+ (N10-008) — Question 239

An organization purchased an allocation of public IPv4 addresses. Instead of receiving the network address and subnet mask, the purchase paperwork indicates the allocation is a /28. This type of notation is referred to as:

Answer options

• A. CIDR
• B. classful
• C. classless
• D. RFC1918

Correct answer: A

Explanation

The correct answer is A, CIDR (Classless Inter-Domain Routing), which allows for more flexible allocation of IP addresses using prefix length notation like /28. Options B and C refer to older classification methods that are not used in this context, while D, RFC1918, pertains specifically to private IP address ranges, not public allocations.