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Exam 300-420 topic 1 question 200 discussion

Actual exam question from Cisco's 300-420
Question #: 200
Topic #: 1
[All 300-420 Questions]



Refer to the exhibit. An engineer is planning an IPv4 to IPv6 migration solution for a customer. The routers in the network can support IPv4 and IPv6, except for the DWDM routers. The DWDM routers provide a Layer 2 link in which the routers peer directly with each other across a DWDM circuit. The circuit also provides connectivity between the mail servers. Which IPv6 migration technique must the engineer deploy?

  • A. ISATAP
  • B. dual-stack
  • C. 6to4
  • D. 6rd
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Suggested Answer: A 🗳️
by cerifyme85 at April 14, 2023, 6:07 a.m.

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Adaletherkesicin
6 months, 3 weeks ago
I think isatap is best answer for this question. We don't need to 6to4 translation because DWDM routers working on the layer 2. So we can choose the A
upvoted 1 times
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electro165
1 year, 2 months ago
Selected Answer: A
Since the DWDM routers don't support IPv6 and provide a Layer 2 link, the appropriate IPv6 migration technique to deploy in this scenario is: A. ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) ISATAP is used to provide IPv6 connectivity across an IPv4-only infrastructure, allowing IPv6 packets to be encapsulated within IPv4 packets. It's typically used within a site or organization to facilitate IPv6 communication. Since the DWDM routers provide a Layer 2 link and don't support IPv6 directly, ISATAP can be used to enable IPv6 connectivity between the routers across the DWDM circuit, even though the DWDM routers themselves are not IPv6-capable.
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dgonzalezexamtopics
1 year, 6 months ago
What about 6rd? It allows SP Provides unicast IPv6 service to customers over IPv4. DWDM routers does NOT support IPv6, but I understand that IPv4 yes. Consequently, u can build an IPv6 in IPv4 tunnel. And BR interfaces has one in IPv6, IPv4 and another one as virtual. There are 3 interfaces. Could it be? I am not sure, dual stack for me is when coexisting IPv6 and IPv4, are you considering cerifyme85 that DWDM will have Ipv4 adresses and will have to coexist with IPv6 nets?
upvoted 2 times
cerifyme85
1 year, 6 months ago
Not sure as well. the question said the full end-end migration. It did not say just provider DWDM link.. if they had specified the link for migration, then I would confidently say one of the tunneling protocols. still confused on this one.
upvoted 1 times
cerifyme85
1 year, 6 months ago
Also with 6rd one would need to enable ipv6 routing on the dwdm routers, to do the tunneling.. but the DWDM routers cannot do ipv6.. not sure if I am missing anyhting on this one
upvoted 2 times
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cerifyme85
1 year, 6 months ago
Selected Answer: B
Guys, my apologies, this dual-stack.. link between them is layer 2.. so layer3 ip/ipv6 stack not needed
upvoted 1 times
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cerifyme85
1 year, 6 months ago
Selected Answer: A
Sorry I will go for ISATAP A.. as we do not need to configure IPv6 on DWDM router
upvoted 2 times
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cerifyme85
1 year, 6 months ago
Selected Answer: C
it says does dwdm does not support dual-stack so answer cannot be dual stack. I am going for tunelling 6to4..C
upvoted 1 times
cerifyme85
1 year, 6 months ago
Sorry I will go for ISATAP A.. as we do not need to configure IPv6 on DWDM router
upvoted 2 times
dgonzalezexamtopics
1 year, 4 months ago
this is the final answer? I ask it because the last date is set with month and weeks, not the accurated day lol
upvoted 1 times
dgonzalezexamtopics
1 year, 4 months ago
https://www.cisco.com/c/en/us/td/docs/optical/15000r10_0/dwdm/network_config/guide/b_ons_network_configuration-R11/b_ons_network_configuration-R11_chapter_01101.html IPv6 compatibility section: it says that is possible with NAT-PT and an GNE/ENE router, and it is not an option here. So, could it be ISATAP
upvoted 1 times
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