Toss up here. I hate questions like this.
The nature of GET VPN technology and function leads to several key benefits:
Instantaneous large-scale any-to-any IP connectivity uses a group IPsec security paradigm.
Takes advantage of underlying IP VPN routing infrastructure and requires no overlay routing control plane.
Seamlessly integrates with multicast infrastructures without the multicast replication issues that you see typically in traditional tunnel-based IPsec solutions.
Preserves the IP source and destination addresses during the IPsec encryption and encapsulation process. Therefore, GET VPN integrates very well with features such as quality of service (QoS) and traffic engineering. Because you can use the native routing protocol with GET VPN, you often get more optimal, efficient pathing for unicast and multicast traffic.
"Group Encrypted Transport VPN (GETVPN) is a tunnel-less VPN solution that provides highly secure communication between systems that are grouped in a network. GETVPN addresses some of the limitations of DMVPN. For example, DMVPN supports direct spoke-to-spoke traffic, but when a spoke wants to send traffic to another spoke, it first must create a new IPsec security association, which can take time and cause delays.
GETVPN solves the scalability issue by using a single IPsec security association for all routers in a group rather than using individual security associations.
GETVPN also supports multicast traffic natively, without using GRE, whereas other options have to use GRE for encapsulation. GETVPN is ideal for private networks like MPLS VPNs."
BD is the correct answer here. GETVPN supports quality of service (QoS) by preserving the original IP header information and allowing the network to prioritize encrypted traffic based on its requirements, it is not one of the specified advantages mentioned in the options given.
answer B is obvious but between B and D its a toss...i would select D because the main advantage of GETVPN when compared to other VPN solutions is that it allows any to any secure communications among GMs without the need to build tunnels to each member
As per this URL, it's also Full mesh so this is tricky question
https://www.cisco.com/c/en/us/td/docs/security/security_management/cisco_security_manager/security_manager/415/user/guide/CSMUserGuide/vpget.pdf
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