A penetration tester is tasked with testing the effectivenes…

A penetrаtiоn tester is tаsked with testing the effectiveness оf а firewall. The pentester sends specially crafted packets tо determine if they can bypass the firewall. After several tests, the tester discovers that some packets are allowed through the firewall. Which of the following is the MOST likely reason for this, and what should the pentester include in their report?