Final answer:
The question deals with calculating usable IP addresses in a subnet with a CIDR of /23. This involves determining the host bits remaining in the address and applying the formula 2n - 2 to compute the number of usable addresses, which comes out to 510 for a /23 subnet.
Step-by-step explanation:
The question pertains to the topic of subnetting in computer networks. It involves calculating the number of usable IP addresses within a subnet given a CIDR notation of /23. This notation indicates the subnet mask uses 23 bits for the network portion. The remaining bits (32-23=9 bits) are used for host addresses within the subnet. The formula for calculating the number of usable IP addresses in a subnet is 2n - 2, where 'n' is the number of bits for host addresses. Therefore, a /23 subnet would have 29 - 2, which equals 510 usable IP addresses. This calculation accounts for two addresses within the range that cannot be used for hosts; the network address and the broadcast address.