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Exam 300-420 topic 1 question 84 discussion

Actual exam question from Cisco's 300-420

Question #: 84
Topic #: 1

A large chain of stores currently uses MPLS-based T1 lines to connect their stores to their data center. An architect must design a new solution to improve availability and reduce costs while keeping these considerations in mind:
✑ The company uses multicast to deliver training to the stores.
✑ The company uses dynamic routing protocols and has implemented QoS.
✑ To simplify deployments, tunnels should be created dynamically on the hub when additional stores open.
Which solution should be included in this design?

A. VPLS
B. GET VPN
C. DMVPN
D. IPsec

Show Suggested Answer

Suggested Answer: C 🗳️

by bogd at Feb. 22, 2022, 7:16 p.m.

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ef869f0

3 weeks, 3 days ago

Selected Answer: C

GET VPN is tunneless

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Reinier_veen

1 year, 7 months ago

Selected Answer: C

I go with C. (DMVPN) This because of the question to go for a "NEW" solution (opposed to ther current MPLS solution). Reducing costs means to use the internet and hence no GETVPN. (due to the IP adressing restrictions).

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Sickcnt

1 year, 8 months ago

Selected Answer: C

"To simplify deployments, tunnels should be created dynamically on the hub when additional stores open." This describes DMVPN GETVPN brings up new tunnels via putting sites under groups and its handled via the "key server" not the HUB I know it doesn't sound practical to do encryption via DMVPN in an MPLS environment (everyone in their right mind would do GETVPN) , but I have read a few scenarios when they did it and I know its possible.

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zlimvos

2 years ago

If I completely ignore that the question is mentioning 'tunnels' while GETVPN is 'tunnel-less' , I will go with GETVPN since it is a bit cheaper and multicast works better. Also can't be coincidence that it is MPLS only network.

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cwoolie

2 years, 1 month ago

Agree C

upvoted 3 times

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cwoolie

2 years, 2 months ago

MPLS is B

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mazinhoo

2 years, 3 months ago

i think its C , because of the third requirement : ✑ To simplify deployments, tunnels should be created dynamically on the hub when additional stores open.

upvoted 4 times

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bogd

2 years, 3 months ago

Selected Answer: B

MPLS connectivity, multicast requirement - both seem to point to GET VPN

upvoted 1 times

laterst

2 years, 3 months ago

bear in mind, this should be a new solution, and one of the goals is to reduce costs. No more MPLS, internet VPN it is. DMVPN is pretty much the only option left.

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cryptonite

2 years, 3 months ago

DMVPN can be run over MPLS, with all the benefits of QoS. Under the hood, DMVPN is GRE with IPSEC, and GRE will deliver multicast.

upvoted 1 times

Emily23

1 year ago

With one mention: IPsec is not default, but can be configured.

upvoted 1 times

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