Google Cloud Professional Cloud Network Engineer Practice Test 2025 - Free Cloud Network Engineer Practice Questions and Study Guide

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What is the total number of addresses in a CIDR /24 subnet?

256 addresses

In a CIDR (Classless Inter-Domain Routing) notation of /24, the "/24" signifies that the first 24 bits of the address are used for the network portion, leaving the remaining 8 bits for host addresses.

To calculate the total number of addresses, you take 2 raised to the power of the number of remaining bits, which is 8 in this case. Thus, \( 2^8 = 256 \). This means there are a total of 256 unique addresses within a /24 subnet.

However, it's important to note that within any given subnet, two addresses are typically reserved: one for the network address and one for the broadcast address. This is relevant when calculating the number of usable addresses for hosts, which would be 256 total minus 2 reserved, resulting in 254 usable addresses in a /24 subnet.

For this question, when focusing specifically on the total count including all designated addresses, the correct figure is 256.

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