The Network Visualization and Vulnerability Detection course is a very practical and useful course in preparing the security professional with the tools to protect the organization’s computer network from internal vulnerabilities, insider threats, and external threats from attackers. For example, a Lynis scan will show where the system needs attention with Warnings itemized in red and it also gives suggestions to harden the system. Another tool, Zenmap is a graphical interface of Nmap, is capable of scanning subnets and makes it easy to discover hosts in graphical interface. It maps out the hosts for the user. It can fingerprint the services that are running and identify the applications and its version numbers. With tools like these to assist identifying vulnerabilities and outdated versions of applications, can remediate vulnerabilities and threats to the network and system. Wireshark is an excellent tool to see all the traffic traversing the network. It allows the security professional to see what applications are running and traffic is traversing the network, whether it’s allowed or suspicious when they’re not expected to see such activity. For instance, if someone is exfiltrating corporate information, the security professional can take steps to lockdown the network.