Social engineering is a tactic used by attackers to manipulate individuals into divulging confidential information, such as passwords. In this scenario, the attacker is impersonating a colleague by using a similar email address with a missing letter, attempting to trick the employee into revealing sensitive information.
Understanding Cisco Cybersecurity Operations Fundamentals (CBROPS) course and materials provide insights into various types of cybersecurity threats, including social engineering, and how to recognize and respond to them.

Wireshark is a widely-used network protocol analyzer that allows users to capture and interactively browse the traffic running on a computer network. It provides full packet capture capabilities, enabling detailed analysis of network traffic. References: This is supported by the CBROPS course materials, which discuss security monitoring and the analysis of network traffic, including full packet capture tools like Wireshark

Host-based firewalls are designed to protect individual workstations from unwanted traffic by filtering incoming and outgoing network communications based on predefined security rules. They can block unauthorized access attempts and prevent potentially harmful traffic from reaching the system.