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Exam 400-007 topic 1 question 177 discussion

Actual exam question from Cisco's 400-007
Question #: 177
Topic #: 1
[All 400-007 Questions]



Refer to the exhibit. Company XYZ is currently running IPv4 but has decided to start the transition into IPv6. The initial objective is to allow communication based on IPv6 wherever possible and there should still be support in place for devices that only support IPv4. These devices must be able to communicate to IPv6 devices as well. Which solution must be part of the design?

  • A. address family translation
  • B. host-to-host tunneling
  • C. dual stack
  • D. 6rd tunneling
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Suggested Answer: A 🗳️
by markmark1983 at Feb. 4, 2023, 1:30 a.m.

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markmark1983
Highly Voted 2 years, 3 months ago
AFT (Address Familty Translation) e.g. NAT64 / NAT46. I believe for Dual Stack the device needs to be configured with IPV4 and IPV6 ? This is not mentioned in the question.
upvoted 5 times
ying162
2 years, 2 months ago
even if the 2 routers to the left are configured with dual stack, IPv4 devices on the top left will not be able to communicate to IPv6 devices on the bottom left unless AFT is applied. Answer is A.
upvoted 7 times
gcpengineer
2 years, 1 month ago
i think its C. With dual stack, both IPv4 and IPv6 addresses are assigned to each device, allowing them to communicate with other devices using either protocol.
upvoted 1 times
Akkisingh
2 years ago
"and there should still be support in place for devices that only support IPv4." - what about IPv4 only? dual stack is NOK.
upvoted 1 times
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biddid2
2 years, 1 month ago
Then it is still using IPv4 but not IPv6, which is not desired in the objective.
upvoted 1 times
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anonymousch
Most Recent 6 months, 2 weeks ago
Selected Answer: A
Correct answer is AFT. The question mentions that the IPv4 devices must be able to communicate to IPv6 devices as well. Dual-Stack is not an option.
upvoted 2 times
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Rollizo
1 year, 3 months ago
Selected Answer: A
IPv4 communicate with IPv6 then AFT with NAT
upvoted 1 times
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Akkisingh
2 years ago
Selected Answer: A
AFT, dual stack can't be, if something doesn't even support IPv6.
upvoted 3 times
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gcpengineer
2 years, 1 month ago
Selected Answer: C
C. With dual stack, both IPv4 and IPv6 addresses are assigned to each device, allowing them to communicate with other devices using either protocol.
upvoted 2 times
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pizdecvsemu
2 years, 2 months ago
Selected Answer: A
A. Dual stack should be fine for this: The initial objective is to allow communication based on IPv6 wherever possible and there should still be support in place for devices that only support IPv4. IPv4 <=> IPv6 need NAT: These devices must be able to communicate to IPv6 devices as well.
upvoted 3 times
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Community vote distribution
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C (25%)
B (20%)
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