Which design consideration must be made when using IPv6 overlay tunnels?
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A. B. C. D.C.
IPv6 overlay tunnels are used to connect isolated IPv6 networks or to transport IPv6 traffic over an IPv4 network. They provide a solution for organizations that are transitioning to IPv6 but have not yet completed the migration, allowing them to maintain connectivity between IPv6 networks.
The design consideration that must be made when using IPv6 overlay tunnels is that they should only be considered as a transition technique toward a permanent solution, which is answer B.
Overlay tunnels should not be viewed as a permanent solution because they add complexity and overhead to the network. In addition, overlay tunnels may introduce performance and security issues that need to be carefully considered. Therefore, organizations should use overlay tunnels as a temporary measure until a permanent solution can be implemented.
For example, if an organization wants to migrate its network from IPv4 to IPv6, it can use overlay tunnels to provide connectivity between IPv6 islands until the entire network has been migrated to IPv6. Once the migration is complete, the overlay tunnels can be removed.
In addition, overlay tunnels should be configured only between border devices, as stated in answer C. This means that only the devices at the edge of the network need to be configured for overlay tunneling. These devices should have the IPv6 protocol stack installed and configured to support tunneling.
Finally, it is worth noting that answer D is incorrect because overlay tunneling does not encapsulate IPv4 packets in IPv6 packets for delivery across an IPv6 infrastructure. Instead, overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure.