What will happen if the ACL is configured with a default 0.0.0.0 mask?
Understand the Problem
The question is asking about the implications of configuring an Access Control List (ACL) with a default mask of 0.0.0.0. It seeks to identify the outcome regarding network traffic filtering.
Answer
ACL with 0.0.0.0 mask permits only a specific IP address.
When an ACL is configured with a default 0.0.0.0 mask, every bit must match exactly. This means the ACL will only permit traffic from a specific single IP address that matches exactly.
Answer for screen readers
When an ACL is configured with a default 0.0.0.0 mask, every bit must match exactly. This means the ACL will only permit traffic from a specific single IP address that matches exactly.
More Information
Using a wildcard mask of 0.0.0.0 requires an exact match of the IP address in the ACL entry, preventing any variation or range of addresses from being permitted.
Tips
Using a mask of 0.0.0.0 in wildcard settings of an ACL incorrectly might unintentionally block traffic by being too restrictive.
Sources
- The web page with info on - Example Source - ciscopress.com
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