Which standard ACE permits traffic from odd-numbered hosts in 10.0.0.0/24?

The correct answer, permit 10.0.0.1 0.0.0.254, uses a wildcard mask to match odd-numbered hosts. The IP address 10.0.0.1 specifies the starting point. The wildcard mask 0.0.0.254 means that the first three octets must exactly match (0.0.0), while the last octet's first seven bits must match (.254 in binary is 11111110). This forces the last bit of the last octet to be 1, which corresponds to odd numbers. permit 10.0.0.0 0.0.0.1 would only permit 10.0.0.0 and 10.0.0.1. permit 10.0.0.1 0.0.0.0 is equivalent to host 10.0.0.1, permitting only that single host. permit 10.0.0.0 255.255.255.254 would permit all hosts in the 10.0.0.0/24 network except for those ending in an even number, which is not the same as permitting only odd-numbered hosts.