Cisco Certified Internetwork Expert (CCIE) Practice Test

What is the purpose of the DTLS fallback in the Cisco AnyConnect VPN Client?

1. To provide higher encryption for data

2. To allow fallback to TLS if DTLS fails

3. To create a session for device management

4. To enhance VPN speed

The correct answer is: To allow fallback to TLS if DTLS fails

The purpose of DTLS fallback in the Cisco AnyConnect VPN Client is to ensure reliability in securing connections. When a DTLS (Datagram Transport Layer Security) connection attempt fails, the client can automatically revert to using TLS (Transport Layer Security). This is essential because while DTLS provides benefits such as reduced latency and improved performance for certain types of applications by allowing UDP transport, there are scenarios where DTLS may not be supported or may fail due to network conditions or firewall rules. By enabling this fallback mechanism, the Cisco AnyConnect VPN Client can maintain a secure connection without the user needing to intervene, thus ensuring continuous access without compromising security. The other options do not accurately describe the primary purpose of DTLS fallback: - Higher encryption for data is not specific to DTLS fallback, as both DTLS and TLS are designed for secure data transmission but serve different purposes in terms of protocols and overhead. - Creating a session for device management is more related to management traffic rather than the core purpose of DTLS and TLS functionality. - While DTLS can enhance VPN speed through lower latency compared to TLS, the fallback mechanism specifically relates to maintaining security when DTLS cannot be established rather than directly enhancing speed.