An administrator is configuring single-area OSPF on a router. Which wildcard mask would they use for the network 192.168.223.0 255.255.254.0?

To determine the correct wildcard mask for the network 192.168.223.0 with a subnet mask of 255.255.254.0, it is essential to understand how to calculate the wildcard mask from the subnet mask.

A wildcard mask is created by taking the inverse of the subnet mask. The subnet mask 255.255.254.0 can be broken down as follows:

• The first octet (255) indicates all 8 bits are used for the network.

• The second octet (255) also indicates all 8 bits are used for the network.

• The third octet (254) means that 7 bits are used for the network and 1 bit is available for hosts (since 254 in binary is 11111110).

• The fourth octet (0) means all bits are available for hosts.

When converting the subnet mask to a wildcard mask, you subtract each octet of the subnet mask from 255:

• First octet: 255 - 255 = 0

• Second octet: 255 - 255 = 0

• Third octet: 255 - 254 = 1

• Fourth octet: 255 - 0 = 255