Cisco
352-001 · Question #227
352-001 Question #227: Real Exam Question with Answer & Explanation
The correct answer is D: L3VPNs (RFC 2547-based) using MP-BGP. RFC 2547-based MPLS L3VPNs with MP-BGP provide scalable any-to-any connectivity across a provider backbone without requiring a full mesh of tunnels between every site.
Question
An enterprise has a large number of retail locations that are currently serviced by a hub-and- spoke Frame Relay network using OSPF as the routing protocol. The enterprise is planning to deploy a high-bandwidth application that requires any-to-any connectivity. Which technology would provide this enterprise with the best bandwidth utilization and greatest scalability?
Options
- Apseudowires based on L2TPv3
- Bmultipoint GRE tunnels between all locations
- Ca full mesh of IPsec tunnels between all locations
- DL3VPNs (RFC 2547-based) using MP-BGP
Explanation
RFC 2547-based MPLS L3VPNs with MP-BGP provide scalable any-to-any connectivity across a provider backbone without requiring a full mesh of tunnels between every site.
Common mistakes.
- A. Pseudowires based on L2TPv3 provide point-to-point Layer 2 circuits, not scalable any-to-any Layer 3 connectivity suitable for a large retail deployment.
- B. Multipoint GRE tunnels require a full mesh to achieve any-to-any connectivity, resulting in O(n-squared) tunnel scaling and high management overhead as the number of locations grows.
- C. A full mesh of IPsec tunnels has the same O(n-squared) scaling limitation as GRE and adds encryption processing overhead, making it unsuitable for a high-bandwidth, large-scale retail deployment.
Concept tested. MPLS L3VPN RFC 2547 scalability and any-to-any connectivity
Community Discussion
No community discussion yet for this question.