300-420 · Question #127
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…
The correct answer is C. DMVPN. DMVPN (Dynamic Multipoint VPN) satisfies all stated requirements: (1) It natively supports multicast traffic, unlike standard IPsec point-to-point tunnels which require GRE wrapping for multicast. (2) It supports dynamic routing protocols (OSPF, EIGRP, BGP) over the tunnel. (3)…
Question
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?
Options
- AVPLS
- BGET VPN
- CDMVPN
- DIPsec
How the community answered
(37 responses)- A5% (2)
- B14% (5)
- C78% (29)
- D3% (1)
Explanation
DMVPN (Dynamic Multipoint VPN) satisfies all stated requirements: (1) It natively supports multicast traffic, unlike standard IPsec point-to-point tunnels which require GRE wrapping for multicast. (2) It supports dynamic routing protocols (OSPF, EIGRP, BGP) over the tunnel. (3) QoS policies can be applied to DMVPN interfaces. (4) Its hub-and-spoke model allows spokes (new stores) to register dynamically with the hub, eliminating manual tunnel configuration for each new site. VPLS is a Layer 2 Ethernet VPN service and does not simplify spoke provisioning the same way. GET VPN uses a group key model and is not tunnel-based in the traditional sense, making dynamic spoke addition more complex. Basic IPsec requires static tunnel definitions per site and does not natively support multicast.
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