CREST Practitioner Security Analyst (CPSA) Practice

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How many addresses per network does Class C provide?

256
65,536
16,777,216
16,384

The correct answer is: 256

Class C addresses allow for a specific number of usable addresses within a single network. In a Class C network, the first three octets (24 bits) are designated for the network part, and the last octet (8 bits) is used for individual host addresses. The total number of addresses in a Class C subnet is calculated as 2 raised to the power of the number of bits allocated for host addresses. In this case, the last octet has 8 bits, which means there are 2^8 = 256 possible addresses. However, it’s important to note that two of these addresses are reserved: one for the network address (the first address) and one for the broadcast address (the last address). Therefore, the number of usable addresses for hosts in a Class C network is actually 256 - 2, which equals 254 usable addresses. However, when the question emphasizes the total number of addresses per network without specifying usable addresses, the total indeed remains 256. This highlights why the answer indicating 256 addresses is accurate in the context of total addresses in a Class C network. The other options provide values that pertain to either Class A or Class B configurations, which employ different subnetting schemes.