CREST Practitioner Security Analyst (CPSA) Practice

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Which subnet mask would you use for Class C networks?

255.0.0.0
255.255.0.0
255.255.255.0
255.255.255.255

The correct answer is: 255.255.255.0

For Class C networks, the commonly used subnet mask is 255.255.255.0. This subnet mask allows for 256 IP addresses in a network (0-255), where typically, one address is reserved for the network itself and one for the broadcast address, resulting in 254 usable host addresses. Class C addresses range from 192.0.0.0 to 223.255.255.255, and the standard subnet mask of 255.255.255.0 matches the typical arrangement for these smaller networks, allowing for segmentation while efficiently utilizing the available address space. Understanding how subnet masks work is crucial in networking, as they define the division between the network portion and the host portion of an IP address. In contrast, the other subnet masks listed are suited for different classes of IP addresses. For instance, 255.0.0.0 is intended for Class A, which covers a broad range of networks, while 255.255.0.0 is utilized for Class B networks that require a larger number of hosts per network. Lastly, 255.255.255.255 is the broadcast address in an IPv4 network and is not suitable as a general subnet mask for Class C. Therefore