Free Cisco 400-007 Practice Exam with Questions & Answers | Set: 11

Comprehensive and Detailed Explanation:

B: The IPsec anti-replay mechanism protects against packet injection and replay attacks by rejecting packets outside the anti-replay window. Increasing the anti-replay window (e.g., to 4096) allows legitimate packets with slightly reordered or delayed sequence numbers to be accepted—especially critical during bursts or with asymmetric paths.

Other options:

A: QoS marking does not prevent replay.

C: Tunnel keyword restrictions don't address replay attacks.

D: Shaping affects traffic rate, not sequence validation.

Comprehensive and Detailed Explanation From Exact Extract of Design Expert (CCDE)

Agile practices and DevOps principles are foundational to infrastructure modernization. Agile enables iterative development, collaboration, and responsiveness to change, while DevOps unifies development and operations, fostering automation, monitoring, and continuous delivery. These elements improve not just technical efficiency but also cultural alignment across teams, boosting productivity and adaptability.

Infrastructure-as-code (Option B) supports automation but is an enabler—not a cultural component by itself. Controlled and dedicated infrastructure reflects traditional IT models that lack agility and flexibility.

==========

Cisco SD-WAN Cloud OnRamp SaaS optimizes cloud application performance by dynamically measuring SaaS application paths from multiple branch edges toward the Microsoft 365 cloud.

It automatically selects the best-performing path, continuously monitors SLA metrics (latency, loss, jitter), and dynamically reroutes based on real-time performance.

This directly addresses SaaS resiliency across multiple ISPs with minimal manual intervention and is aligned with CCDE v3.1 SD-WAN design methodologies for SaaS optimization.

Why other options are incorrect:

A: Cloud OnRamp gateway is for IaaS optimization (AWS, Azure), not SaaS.

B: Cloud OnRamp SWG (Secure Web Gateway) is for internet-bound security inspection, not SaaS path optimization.

C: "Cloud OnRamp" alone is too general; SaaS is the specific solution for this SaaS use case.

The hierarchical model provides:

A: Fault isolation by limiting failures to specific layers.

D: Modularity and flexibility, making it easier to implement changes without affecting the entire network.

Why other options are incorrect:

B: Design typically starts at the access layer upwards.

C: Server access is handled at the distribution or access layer, not the core.

E: Security is handled at access/distribution layers, not primarily at core layer.