Which of the following represents a network device that requires isolation from internal systems when providing remote access?

The VPN Gateway is designed specifically to establish secure connections over the internet, allowing remote users to access internal networks securely. When providing remote access, it is crucial for a VPN Gateway to be isolated from internal systems. This isolation minimizes the risk of unauthorized access to sensitive internal resources. By implementing this separation, organizations can enforce strict access controls and security protocols, ensuring that any data traffic routed through the VPN Gateway remains secure and does not directly impact the internal network's integrity.

Isolation is particularly important because a compromised VPN Gateway can be a target for attackers seeking to gain access to internal network resources. Keeping this device in a separate zone allows for better monitoring and incident response capabilities, thereby strengthening an organization's overall security posture.

In contrast, while firewalls, routers, and switches are essential components of network infrastructure, their primary functions differ. Firewalls act as barriers to control incoming and outgoing traffic based on predetermined security rules. Routers direct data packets between different networks, and switches facilitate communication within the same local area network but are not typically isolated for remote access purposes. Therefore, among the options provided, the VPN Gateway is the ideal choice for requiring isolation when facilitating remote access.