Multiple choice

Which of the following statements is true about wildcard masks?

  1. Inverting the subnet mask will always create the wildcard mask.

  2. A wildcard mask identifies a network or subnet bit by using a 1.

  3. The same function is performed by both a wildcard mask and a subnet mask.

  4. When a 0 is encountered in a wildcard mask, the IP address bit must be checked.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In wildcard masks, a 0 bit means the corresponding IP address bit must match exactly, while a 1 bit means 'don't care' - the bit can be any value. This is the opposite of subnet masks, where 1 means network portion and 0 means host portion. Wildcard masks are commonly used in access control lists and OSPF configuration.

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