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Which of the options below will do the most to reduce an organization's attack surface on the internet?

Allied services have recently purchased NAC devices to detect and prevent non-company owned devices from attaching to their internal wired and wireless network. Corporate devices will be automatically added to the approved device list by querying Active Directory for domain devices. Non-approved devices will be placed on a protected VLAN with no network access. The NAC also offers a web portal that can be integrated with Active Directory to allow for employee device registration which will not be utilized in this deployment. Which of the following recommendations would make NAC installation more secure?

An auditor is focusing on potential vulnerabilities. Which of the following should cause an alert?

What tool creates visual network topology output and results that can be analyzed by Ndiff to determine if a service or network asset has changed?

According to attack lifecycle models, what is the attacker's first step in compromising an organization?