(ISC)2 Certified in Cybersecurity Practice Exam

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SSL/TLS VPNs work at the application layer (Layer 7) of the OSI model over TCP port _________.

443
139
8081
445

The correct answer is: 443

SSL/TLS VPNs primarily operate at the application layer (Layer 7) of the OSI model, which allows them to handle specific application-level data and provide user-level security. The commonly used port for SSL/TLS communications is port 443. This port is typically designated for HTTPS traffic, which is secured by SSL/TLS protocols and is utilized for secure web-based communications. When using SSL/TLS VPNs, they leverage this established port for secure data transmission, ensuring that the information exchanged between the client and server is encrypted and protected from eavesdropping and tampering. This is why port 443 is the correct answer; it directly correlates with the secure socket layer that VPNs utilize for secure communications over the internet. The other ports listed are associated with different services and protocols, such as file sharing or general web traffic, and are not relevant to the standard implementation of SSL/TLS VPNs.