400-007 Exam Dumps - Cisco Certified Design Expert (CCDE v3.1)

DUMPS (Designated Unified Multiprotocol Redistribution Strategy) using single-point redistribution with route tagging ensures scalable, loop-free redistribution.

Route tags prevent redistributed routes from being re-advertised into the originating protocol, avoiding routing loops even with multiple paths.

Single-point redistribution simplifies operational complexity compared to multipoint redistribution.

Why other options are incorrect:

A, B, D: ACLs are not scalable for filtering redistributed routes in large networks. Tags provide better control.

Let’s calculate Total Cost of Ownership (TCO) for 24 months based on the table and given scaling requirements:

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Metro Ethernet:

CAPEX = $45,000

Installation Fee = $5,000

OPEX = $125,000/year → $250,000 for 2 years

Total = 45,000 + 5,000 + 250,000 = $300,000

DWDM:

CAPEX = $250,000

Installation Fee = $30,000

OPEX = $100,000/year → $200,000 for 2 years

Total = 250,000 + 30,000 + 200,000 = $480,000

CWDM:

CAPEX = $150,000

Installation Fee = $25,000

OPEX = $100,000/year → $200,000 for 2 years

Total = 150,000 + 25,000 + 200,000 = $375,000

MPLS:

CAPEX = $50,000

Installation Fee = $75,000

OPEX = $150,000/year → $300,000 for 2 years

Total = 50,000 + 75,000 + 300,000 = $425,000

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Metro Ethernet clearly results in the lowest total cost while meeting dual 10G and scalable growth to 20 connections due to its simple provisioning and operational flexibility.

This approach fully aligns with CCDE v3.1 business-driven cost modeling principles: balancing cost, scalability, and operational simplicity.

Why other options are incorrect:

B, C, D: All are more expensive after full 2-year calculation for the required scale.

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A (Risk-based and adaptive access policies): After verifying user identity within a Zero Trust architecture, the next logical step is to apply continuous, adaptive risk-based policies that evaluate contextual factors (device posture, behavior, location, etc.) before granting access. This approach dynamically responds to threats such as phishing attacks by adjusting access permissions based on real-time risk.

Other options explained:

B/C/D: These are supporting mechanisms, but risk-based policies directly address dynamic attack mitigation.

DTLS (Datagram Transport Layer Security) is the most optimized overlay protocol for SDWAN deployments over public internet, especially when NAT traversal is required.

It combines security similar to TLS while using UDP, which handles packet loss, jitter, and reordering better than TCP-based TLS.

DTLS is natively supported in most SDWAN solutions for encrypted transport across NAT environments without complex configurations.

It allows optimal performance on unreliable or high-latency networks while maintaining strong security standards.

Why other options are incorrect:

A (TLS): Uses TCP, less suited for networks with packet loss or reordering.

C (IPsec): Requires additional NAT traversal mechanisms like NAT-T and may not handle unreliable underlay as effectively as DTLS.

D (GRE): Tunneling protocol without native encryption.

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D (Deploy SD-WAN edge routers in data center, then controllers, then branches):This allows the SD-WAN fabric to be built and stabilized centrally first, then controllers are brought online for policy orchestration, and finally, branch migrations happen gradually without impacting existing traffic paths.

Other options explained:

A/B/C: These approaches risk service disruption or poor controller orchestration readiness during branch migrations.

Data governance, especially for a national bank under EU regulations, is the most critical factor.

Regulations like GDPR restrict where and how sensitive data, particularly financial data, can be stored and processed.

Migrating data outside of EU jurisdictions without compliance could result in legal violations.

Why other options are incorrect:

B: Latency is important but secondary to regulatory compliance.

C: Security is always important but not the unique issue here.

D: Cloud connectivity is technical, not the primary legal concern.

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Data Sovereignty: Store and manage encryption keys outside of the cloud, Only grant access to encryption keys based on detailed access justification.

Operational Sovereignty: Restrict the deployment of new resources to specific provider regions, Control the availability of the workloads and run them wherever needed, without depending on a single cloud provider.