What is the wildcard mask for the OSPF network statement of 64.100.0.0 255.255.255.0?

In OSPF, a wildcard mask is used in place of a standard subnet mask to identify which bits of an IP address should be matched and which can vary. The standard subnet mask in this case is 255.255.255.0, which indicates that the first three octets (64.100.0) are the network part of the address, while the last octet (.0) represents the hosts within that network.

To calculate the wildcard mask, you need to subtract each octet of the subnet mask from 255. Doing this for the subnet mask 255.255.255.0 results in:

• For the first octet: 255 - 255 = 0

• For the second octet: 255 - 255 = 0

• For the third octet: 255 - 255 = 0

• For the fourth octet: 255 - 0 = 255

Thus, the wildcard mask comes out to be 0.0.0.255. This indicates that the OSPF process will match the first three octets of the IP address (64.100.0.x) and that the fourth octet can vary, allowing OSPF to recognize