300-320 · Question #669
Which of the statements about dual stack is correct?
The correct answer is D. Dual stack allows the host to communicate both over IPv4 and IPv6 without encapsulation. (D) Dual stack is the simplest IPv6 transition mechanism: a host or router runs both IPv4 and IPv6 protocol stacks natively and can communicate over either protocol without any encapsulation or translation. (A) is false - dual stack does require additional resources because…
Question
Which of the statements about dual stack is correct?
Options
- ADual stack does not require additional resources on networking devices.
- BDual stack improves the latency on hosts.
- CBy default, IPv6 sessions are established only after an IPv4 session request times out.
- DDual stack allows the host to communicate both over IPv4 and IPv6 without encapsulation.
How the community answered
(53 responses)- A2% (1)
- B8% (4)
- C4% (2)
- D87% (46)
Explanation
(D) Dual stack is the simplest IPv6 transition mechanism: a host or router runs both IPv4 and IPv6 protocol stacks natively and can communicate over either protocol without any encapsulation or translation. (A) is false - dual stack does require additional resources because both full protocol stacks must be maintained on each device. (B) is false - running two stacks adds overhead and does not improve latency. (C) is false - with the Happy Eyeballs algorithm (RFC 8305), clients actually attempt IPv6 first and fall back to IPv4 if IPv6 fails, not the other way around.
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