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Exam 400-007 All Questions

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Exam 400-007 topic 1 question 120 discussion

Actual exam question from Cisco's 400-007
Question #: 120
Topic #: 1
[All 400-007 Questions]

Company XYZ is migrating their existing network to IPv6 and they must plan for Layer 2 and Layer 3 devices. Some of the access layer switches do not support IPv6, however, core and distribution switches fully support unicast and multicast routing. The company wants to minimize cost of the migration. Which migration strategy should be used in the design?

  • A. The access layer switches must support IGMP snooping at a minimum. Any switches that do not support IGM snooping must be replaced.
  • B. The access layer switches must support DHCPv6. Any switches that do not support DHCPv6 must be replaced.
  • C. Upgrade the nonsupporting switches. Otherwise, it will cause an issue with the migration.
  • D. Layer 2 switches will not affect the implementation of IPv6. They can be included in the design in their current state.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by gcpengineer at March 6, 2023, 5:38 p.m.

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Nery
2 months, 3 weeks ago
Selected Answer: D
The correct answer is: D. Layer 2 switches will not affect the implementation of IPv6. They can be included in the design in their current state.Layer 2 switches (which operate at the data link layer) do not need to fully support IPv6 to carry IPv6 traffic. The main role of Layer 2 switches is to forward Ethernet frames based on MAC addresses, and they are agnostic to the Layer 3 protocols (IPv6 or IPv4). As long as the Layer 2 devices are functioning correctly and not blocking IPv6 traffic at the data link layer, they can continue to operate in their current state during the migration.
upvoted 1 times
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noxkrugger
9 months, 3 weeks ago
Yes it is D
upvoted 1 times
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Seawanderer
1 year ago
Selected Answer: D
I don't see multicast requirements in the question
upvoted 2 times
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bdp123
1 year, 1 month ago
Selected Answer: D
they can use dual stack or address translation during the migration
upvoted 2 times
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PeterCheng
1 year, 5 months ago
Selected Answer: C
other source is C
upvoted 1 times
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main_street
2 years, 3 months ago
D seem correct https://community.cisco.com/t5/voice-over-ip/ipv6-with-cisco-layer-2-switches/td-p/1044509
upvoted 4 times
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gcpengineer
2 years, 3 months ago
Selected Answer: C
as layer 2 switches can potentially impact the implementation of IPv6, particularly if they do not support features such as Neighbor Discovery Protocol (NDP) and Stateless Address Autoconfiguration (SLAAC).
upvoted 2 times
pizdecvsemu
2 years, 3 months ago
I agree with you, but... 1. they want to minimize the cost and legacy L2 switches will pass IPv6; 2. Legacy switches should not affect migration, but will affect operation; I'm not sure :-).
upvoted 3 times
biddid2
2 years, 3 months ago
I agree with piz... you cannot say old L2 switch cannot configure IPv6 ACL... less money less requirement
upvoted 1 times
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A (35%)
C (25%)
B (20%)
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