What is the primary function of a VPN concentrator?

The primary function of a VPN concentrator is to create and manage secure VPN connections for remote users and sites. This specialized network device establishes secure encrypted tunnels over the internet, allowing users to connect to a private network safely and ensuring that data transmitted between the user's device and the network remains confidential and secure from potential eavesdroppers. In addition to creating these secure connections, a VPN concentrator manages multiple VPN tunnels, accommodating various users simultaneously and providing scalability to support numerous connections.

The other options refer to different aspects of network security and management. While a security feature that prevents unauthorized access plays a role in overall network security, it is not the specific function of a VPN concentrator. Network performance analysis tools focus on monitoring and optimizing traffic flow rather than creating secure connections. Lastly, routing internet traffic through multiple servers is more associated with proxy servers or load balancers, rather than the specific function of establishing and maintaining secure VPN connections.