An administrator has set up several IPSec and SSL tunnels to terminate on a single device. Which of the following has the administrator deployed?

A proxy server acts as an intermediary for client web requests to retrieve content on their behalf and does not terminate VPN tunnels.

A load balancer distributes incoming network traffic or application requests across multiple backend servers to improve availability and does not manage VPN tunnel termination.

A VPN concentrator aggregates multiple incoming VPN tunnels - whether IPSec site-to-site tunnels or SSL/TLS remote-access tunnels - onto a single appliance, handling encryption, authentication, and tunnel management at scale. It is purpose-built for this function, offering high throughput and many concurrent session support beyond what a general-purpose router or firewall provides. Cisco ASA and similar appliances are common examples deployed as VPN concentrators.

A Web Application Firewall (WAF) inspects and filters HTTP/HTTPS traffic to protect web applications from attacks such as SQL injection and XSS, and is not designed to terminate IPSec or SSL VPN tunnels.