B is correct - he use of overlay tunnels should be considered as a transition technique toward a network that supports both the IPv4 and IPv6 protocol stacks or just the IPv6 protocol stack.
B is correct - Overlay tunnels can be configured between border devices or between a border device and a host; however, both tunnel endpoints must support the IPv4 and IPv6 protocol stacks.
B is the correct answer
Overlay tunnels reduce the maximum transmission unit (MTU) of an interface by 20 octets (assuming that the basic IPv4 packet header does not contain optional fields). A network that uses overlay tunnels is difficult to troubleshoot. Therefore, overlay tunnels that connect isolated IPv6 networks should not be considered a final IPv6 network architecture. The use of overlay tunnels should be considered as a transition technique toward a network that supports both the IPv4 and IPv6 protocol stacks or just the IPv6 protocol
stack.
A is incorrect
B is correct
C is incorrect: Page 69 OCG Book "IPv6 over Ipv4 Tunneling Strategy" Goes word by word but this answer is incorrect.
D This answer is also incorrect: Page 69 OCG Book "IPv6 over Ipv4 Tunneling Strategy" Goes word by word but this answer is incorrect.
Option B is the correct answer because IPv6 overlay tunnels are typically used as a temporary solution to allow IPv6 connectivity across an IPv4 network. While overlay tunnels can provide IPv6 connectivity in the short term, they are not a long-term solution and can introduce additional complexity and overhead to the network. In general, it is recommended to migrate to a native IPv6 network architecture as soon as possible.
B is correct.
C is almost correct, however the part about "and require only the IPv6 protocol stack." is wrong. In the NSLD 300-420 Cert Guide - Chapter 2 "Internet Protocol Version 6 (IPv6) Design" - IPv6 over IPv4 Tunneling Strategy, page 69, it states "Overlay tunnels can be configured between border devices or between a border device and a host; however, both tunnel endpoints must support the IPv4 and IPv6 protocol stacks."
B is correct, C is wrong. C state that "border devices and require only the IPv6 protocol stack"
while border devices and require IPV4 and IPv6 protocol stack.
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