Practice Quiz

CompTIA Network+

Category - Security

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Nathan has just finished installing a brand new firewall blocking FTP traffic. Almost immediately after the installation, Nathan is receiving calls that everyone in the office is no longer able to access the internet. Which of the following BEST explains the reason for the outage?
  1. Implicit deny is blocking all traffic, not just FTP.
  2. The firewall had a built in IPS that isn’t allowing traffic to go through.
  3. The firewall is defective and needs to be replaced.
  4. The firewall’s IP address settings were improperly configured.
Explanation
Answer: A - Implicit deny blocking all traffic best explains the reason for outage.

Key takeaway: The firewall rule-set “implicit deny” states that anything that is not specifically outlined and identified as an “allow” rule, will be denied. In this case, the most likely explanation is that the new firewall had a default configuration of implicit deny. This is a common security feature that basically ensures that when plugged in, will immediately ensure a safer connection.
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