TestOut LabSim A+ Certification Practice Exam

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What is the default subnet mask for the IP address 203.111.3.3?

255.255.255.0
255.255.0.0
255.255.255.128
255.255.255.255

The correct answer is: 255.255.255.0

The default subnet mask for the IP address 203.111.3.3 is 255.255.255.0 because this address belongs to Class C of IP addresses. Class C addresses range from 192.0.0.0 to 223.255.255.255, and they are typically used for smaller networks. The default subnet mask for Class C addresses is 255.255.255.0, which allows for 256 IP addresses in a single subnet (0-255 range) but reserves one for the network address and one for the broadcast address, resulting in 254 usable IP addresses for hosts. Choosing the other subnet masks would not be appropriate for this Class C address. For example, 255.255.0.0 is the default subnet mask for Class B addresses, while 255.255.255.128 is a custom mask often used for subnetting within Class C networks but is not the default. The mask 255.255.255.255 is a special mask that indicates a single host and is not applicable for a typical network scenario.