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

Bidirectional Forwarding Detection (BFD) provides fast failure detection independent of routing protocols. It can be integrated with multiple protocols to accelerate convergence:

A: IS-IS supports BFD for fast hello processing.

B: BFD can track static routes via routing tracking features.

D: EIGRP supports BFD for link failure detection.

E: BGP supports BFD for rapid session teardown.

Why option C is incorrect:

C: RIP does not natively support BFD integration.

—

In this architecture:

A secure web proxy is introduced to inspect and filter all web (HTTP/HTTPS) traffic.

Remaining traffic (non-web) must pass through an NGFW with IPS capabilities.

Both the web proxy and NGFW reside between the collapsed distribution/core and internet edge.

To enforce that all web traffic is directed to the proxy appliance for inspection and non-web traffic follows its usual path to the NGFW:

A. Policy-Based Routing (PBR) on the Collapsed Core

This allows traffic classification based on destination port (e.g., TCP 80/443) and selectively reroutes web traffic to the proxy. Non-web traffic continues toward the NGFW. PBR is essential here because traditional routing (based only on destination IP) would not differentiate between traffic types.

D. Static Routing on the Appliance

The proxy appliance must return the traffic back toward the NGFW for final processing and internet egress. This is typically achieved using static routes on the proxy device, ensuring the return path sends packets back to the correct firewall interface for consistent inspection.

❌ B. Policy-based routing on the internet edge: Not applicable here, as rerouting must occur closer to the source (collapsed core), before traffic reaches the internet edge.

❌ C. Policy-based routing on firewalls: This adds unnecessary complexity. Firewalls should focus on enforcing security policies, not traffic redirection logic in this scenario.

This approach adheres to CCDE v3.1 best practices by separating policy enforcement functions and enabling scalable, deterministic traffic flow through layered security appliances.

A (Faster detection and response):Telemetry like IPFIX enables real-time network visibility and anomaly detection, significantly improving Mean Time to Detect (MTTD) and Mean Time to Respond (MTTR).

Other options explained:

B: IPFIX feeds data to incident response, but doesn ' t directly integrate plans.

C: IPFIX improves detection but primarily reduces response time.

D: Asset identification typically uses CMDB or inventory tools, not IPFIX alone.