Isolation and Containment

Correct Answer: Creating a separate VLAN

The best method for a network technician to use to ensure proper isolation and containment for the accounting department would be 'Creating a separate VLAN'. VLAN can partition a network into separate isolated domains, which would limit interactions between systems to help protect sensitive accounting data. The other answers are not as fitting. 'Activating a port-based access-control list' could limit connectivity based on source port but doesn't isolate entire systems or departments. 'Implementing a firewall with application-layer filtering' provides protection against specific types of threats but not overall departmental isolation. Similarly, 'Applying a MAC filtering rule' could limit access based on device but again does not provide overall isolation for an entire department.

Correct Answer: Implement a separate VLAN for the medical record system

Implementing a separate VLAN (Virtual Local Area Network) for the medical record system will be the most effective way to segment and isolate the system. VLANs can logically separate network traffic so that only devices within the same VLAN can communicate directly. This approach ensures the medical record system is isolated from other network resources, providing an additional layer of security. The usage of MAC filtering, NAT for IP mapping, or Web Application Firewall, though beneficial in different scenarios, are not the most effective for segmenting and isolating a specific system or network within a hospital setting. MAC filtering doesn't isolate network traffic, NAT only hides internal IPs but still leaves the network accessible while WAF adds protection for web applications against common web exploits but doesn't segment a network.

Correct Answer: VLAN

The best solution to isolate guest Wi-Fi users from the corporate network is by implementing a VLAN (Virtual Local Area Network). VLANs allow network administrators to partition their network and control what each partition (or guest in this case) can access. This will effectively isolate the guest Wi-Fi users from accessing sensitive corporate network resources. As for the other options, DMZ (Demilitarized Zone) is a physical or logical subnetwork that exposes an organization's external-facing services to the Internet, which is not quite necessary for just isolating guest Wi-Fi users. A Firewall controls the incoming and outgoing network traffic based on predetermined security rules, but it does not inherently isolate Wi-Fi users from the corporate network. Lastly, a VPN (Virtual Private Network) typically extends a private network across a public network, and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network, which does not serve the purpose of isolating guest Wi-Fi users from the corporate network.