400-007 Exam Dumps - Cisco CCDE v3.0 Questions and Answers

C. Fragment data packets: On slow WAN links, large data packets can delay small voice packets (serialization delay). Fragmentation ensures that voice packets are interleaved and not delayed behind large data frames (Link Fragmentation and Interleaving - LFI).

E. Prioritize voice packets: QoS mechanisms (LLQ, priority queuing) ensure that voice traffic is serviced first, reducing jitter and delay.

These are both critical QoS design principles for real-time application performance in constrained branch WAN scenarios, as outlined in CCDE v3.1.

Why other options are incorrect:

A: Increasing bandwidth may help but doesn’t address serialization or prioritization.

B: Memory upgrades do not directly improve voice quality.

D: Fiber upgrades do not address WAN-specific serialization or QoS.

B (OSPF Type 1 external):Type 1 external routes include both the external cost (from redistribution) and the internal OSPF cost to the ASBR. This ensures accurate end-to-end metric calculation across domains.

Other options explained:

A: Type 2 external ignores internal OSPF cost, potentially creating suboptimal routing.

C/D: EIGRP doesn’t use OSPF metric types; redistribution into EIGRP uses EIGRP metrics.

Because asymmetric routing is occurring, strict uRPF (which requires the return path match) would block legitimate traffic. In this scenario, deploying uRPF loose mode is optimal:

Loose mode checks only for the existence of the source IP in the routing table, not the exact interface.

It provides protection against spoofed IP packets even if asymmetric routing occurs.

Why other options are incorrect:

A: Null0 static routes do not prevent spoofed source addresses.

B: Strict mode would incorrectly drop valid traffic due to asymmetry.

C: ACLs could help but may not scale or adapt dynamically to traffic patterns.

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The question describes a network that requires virtualization at both control and data plane levels using VLANs and VRFs. This architecture aligns with:

Path isolation (A): Achieved using VRFs and VLANs, ensuring traffic separation at Layer 2 and Layer 3 across the entire network.

Group virtualization (C): Refers to grouping users or resources (such as departments or tenants) into isolated segments that remain logically separated throughout the campus fabric.

Other options explained:

B (Session isolation): More aligned with application or session-layer security, not data/control plane virtualization.

D (Services virtualization): Typically related to virtualizing network services (firewalls, load balancers).

E (Edge isolation): Not a standard design term in CCDE.

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Comprehensive and Detailed Explanation:

A: QoS (Quality of Service) helps preserve performance for critical applications when only one link is available by prioritizing high-value traffic. This solution works within existing infrastructure—meeting the "no additional CAPEX" requirement.

Other options:

B and C introduce new hardware or services—thus increase CAPEX.

D: Dynamic routing helps with failover but doesn't solve the bandwidth issue under failure conditions; QoS does.

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B (Kubernetes):Kubernetes is designed for container orchestration with full state-awareness, handling deployment, scaling, failover, and service discovery. It continuously monitors and maintains the desired state across distributed microservice deployments.

Other options explained:

A: Puppet handles configuration management, not container orchestration.

C: Ansible provides automation but lacks native orchestration state tracking.

D: Terraform handles infrastructure provisioning, not runtime service orchestration.

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.

In this scenario, the application itself duplicates data transmission across two separate NICs on Host A, with the intention that at least one copy will reach Host B, regardless of any single path or link failure. While this increases redundancy at the application and host level, the underlying network must also support rapid failure recovery to avoid packet loss during convergence events.

Among the options provided:

A. EIGRP with feasible successors provides pre-computed backup routes but still requires routing protocol convergence upon failure, which could result in millisecond-scale interruption—enough to cause data loss if packets are in transit.

B. BFD (Bidirectional Forwarding Detection) offers rapid detection of link failures, but by itself does not provide traffic redirection or packet protection; it simply informs the routing protocol faster.

D. Static routes lack dynamic convergence capabilities and would not offer high availability across dynamic failure points unless manually configured with tracking—still less responsive and scalable.

C. IP Fast Reroute (IP FRR) is specifically designed to offer sub-50ms convergence time by pre-installing backup paths in the forwarding plane. Upon detecting a failure, traffic is immediately switched to the pre-computed alternate path without waiting for the routing protocol to reconverge. This ensures minimal disruption and best supports lossless delivery for high-availability applications.

IP FRR is consistent with CCDE v3.1 design principles where sub-second convergence and resiliency are critical in mission-critical enterprise and data center architectures.

A (Posture assessment with remediation VLAN):Posture assessment checks endpoint compliance (such as AV definitions). Non-compliant devices are placed into a remediation VLAN where they can update before regaining normal network access.

Other options explained:

B: SGTs provide segmentation but are not posture-specific.

C: dACLs with SGTs handle policy enforcement, but posture control is required for AV compliance.

D: Quarantine VLAN isolates devices but doesn’t automate remediation.

B (Automation spans multiple vendors and services):Automation tools can handle provisioning, configuration, monitoring, and integration across heterogeneous vendor networks.

D (Provisioning services = automation):Routine tasks like service provisioning, device onboarding, or configuration are handled by automation systems to reduce operational workload.

Other options explained:

A: Automation can absolutely include policy enforcement if integrated properly.

C: Orchestration governs higher-level workflows across multiple domains and uses APIs but is not limited to basic automation tasks.

E: Orchestration coordinates complex workflows, not just single low-level tasks.