This question aligns with CHFI v11 objectives underNetwork and Web AttacksandNetwork Log Analysis, particularly the interpretation ofCisco firewall (ASA) log messages. Cisco ASA firewalls use numeric mnemonics to categorize and describe specific security events. Understanding these mnemonics is critical for forensic investigators when reconstructing attack attempts and identifying malicious network behavior.

TheCisco ASA message ID 106022corresponds to a“Deny protocol connection spoof”event. This log entry is generated when the firewall detects a packet with aspoofed source address, meaning the packet’s source IP does not match the expected routing or interface from which it was received. Such behavior is commonly associated with reconnaissance, evasion attempts, or denial-of-service attacks.

CHFI v11 emphasizes that spoofed connection attempts are strong indicators of malicious activity and are frequently logged by perimeter security devices. By analyzing this log, investigators can identify attempted impersonation, trace attack origins, and correlate events across network devices.

The other options represent different Cisco ASA mnemonics, such as ICMP filtering, reverse path forwarding (RPF) failures, and teardrop attack detection. Therefore, based on Cisco firewall logging patterns, the correct description for mnemonic106022is“Deny protocol connection spoof from source_address to dest_address on interface interface_name.”