CompTIA Cloud+ Practice Test

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A technician needs to configure a virtual NIC on a Class A IP address network. What is the default subnet mask for this network?

The correct answer is: /8

The default subnet mask for a Class A IP address network is indeed /8. In classful networking, Class A addresses range from 0.0.0.0 to 127.255.255.255, and the standard subnet mask for this class is 255.0.0.0, which corresponds to a /8 prefix length. This means that in a Class A network, the first 8 bits are used for the network identifier, while the remaining 24 bits are available for host addresses within that network. Options such as /16, /24, and /28 represent subnet masks that correspond to Class B and Class C networks, respectively, where more bits are allocated for the network and fewer for hosts. For example, /16 is a default subnet mask for Class B (255.255.0.0), /24 for Class C (255.255.255.0), and /28 is a much smaller subnet mask used for very small networks, allowing for only 16 addresses. Thus, selecting /8 indicates the technician is working with the default configuration of a Class A network, which is appropriate in this scenario.