CCNA 3 Enterprise Networking, Security, and Automation Version 7.0 Practice Exam 2025 - Free Practice Questions and Study Guide

To determine the appropriate wildcard mask for the OSPF configuration, we need to analyze the provided network address and subnet mask. The network address is 192.168.0.0 with a subnet mask of 255.255.252.0.

The subnet mask of 255.255.252.0 can be converted to a binary format to identify the number of bits used for the network prefix. In binary, this mask is represented as:

- 255: 11111111

- 255: 11111111

- 252: 11111100

- 0: 00000000

From this, we can conclude that the first 22 bits (the total number of 1s in the binary representation of the subnet mask) are used for the network portion, leaving 10 bits for the host portion.

To convert a subnet mask to a wildcard mask, which is used in OSPF configuration, we subtract each octet of the subnet mask from 255. This is calculated as follows:

- For the first octet: 255 - 255 = 0

- For the second octet: 255 - 255 = 0

- For the third octet