Exam 300-420 All Questions

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Exam 300-420 topic 1 question 163 discussion

Actual exam question from Cisco's 300-420

Question #: 163
Topic #: 1

Refer to the exhibit. A customer wants to adopt a dynamic site-to-site VPN solution to secure communication for VoIP, video, and FTP traffic between the remote branches and the headquarters. The customer also wants the branches to communicate directly, thereby reducing traffic at the headquarters location. The solution most consider that the branch routers are limited in available memory. Which VPN solution meets these requirements?

A. DMVPN Phase 2 Hub and Spoke design
B. DMVPN Phase 3 Hub and Spoke design
C. DMVPN Phase 3 Hierarchical design
D. DMVPN Phase 1 Hub and Spoke design

Show Suggested Answer

Suggested Answer: B 🗳️

by XalaGyan at Feb. 3, 2023, 8:06 p.m.

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mgiuseppe86

7 months, 2 weeks ago

Selected Answer: B

Why is everyone typing A but no one is voting A? I agree it should be A as well. It says nothing about requiring additional services and limited memory is a factor. But now I think about it, you will need ospf or EIGRP to route to other spokes. Maybe it is B afterall.

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J2J2J2J

1 year ago

Selected Answer: B

DMVPN Phase 1: All traffic flows through the hub. The hub is used in the network’s control and data plane paths. DMVPN Phase 2: Allows spoke-to-spoke tunnels. Spoke-to-spoke communication does not need the hub in the actual data plane. Spoke-to-spoke tunnels are on-demand based on spoke traffic triggering the tunnel. Routing protocol design limitations exist. The hub is used for the control plane but, unlike phase 1, not necessarily in the data plane. DMVPN Phase 3: Improves scalability of Phase 2. We can use any Routing Protocol with any setup. “NHRP redirects” and “shortcuts” take care of traffic flows.

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314_pi

1 year ago

Selected Answer: B

DMVPN Phase 3 is the final and most scalable phase in DMVPN as it combines the summarisation benefits of phase 1 with the spoke-to-spoke traffic flows achieved via phase 2. https://learningnetwork.cisco.com/s/article/dmvpn-concepts-amp-configuration

upvoted 1 times

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bccabrera

1 year, 1 month ago

Selected Answer: A

A, because the solution most consider that the branch routers are limited in available memory.

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dgonzalezexamtopics

1 year, 2 months ago

As I understand, communications must be Spoke2Spoke and slso reduce the overhead due to the lack of memory. Then, L2 DMVPN: S2S routing via NHRP under the hood implies Spoke to Spoke communication al well as reducing traffic overhead. Should not be A?

upvoted 1 times

bccabrera

1 year, 1 month ago

It should be A.

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jzzmth

1 year, 3 months ago

Selected Answer: B

I'm going wth B. DMVPN Phase 3 increases scalability of the network by minimizing the amount of routing information that the spokes need to maintain, thus greatly reducing the routing table overhead vs Phase 2...

upvoted 3 times

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XalaGyan

1 year, 4 months ago

Selected Answer: B

Correct answer is B. Level 1 - All routing via Hub Level 2 - Spoke to Spoke Routing via NHRP under the hood Level 3 - all to all communication with a routing protocol on top. We have limited resources, therefore i chose to go with A. Level 2 gets the job done and i dont need an additional memory overhead of routing protocol. HTH

upvoted 2 times

Tasabgd90

1 year, 4 months ago

Wait, is it A or B then?

upvoted 1 times

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XalaGyan

1 year, 4 months ago

upvoted 2 times

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