You want to run the nmap command that includes the host specification of 202.176.56-57.*. How many hosts will you scan?

1024 would require four values across the specified octet range multiplied by 256, which does not match the 56-57 range.

256 would be correct only if a single value were specified in the third octet rather than a two-value range.

Nmap's range notation 56-57 specifies two discrete values for the third octet (56 and 57). The wildcard (*) in the fourth octet represents all 256 values from 0 to 255. Multiplying 2 by 256 gives exactly 512 hosts to be scanned across the two /24-equivalent ranges.

64 does not correspond to any valid arithmetic result from the given host specification.