Pass the Cisco CCDE v3.0 400-007 Questions and answers with ExamsMirror

Comprehensive and Detailed Explanation:

C: Moving workloads or backup/recovery functions to cloud platforms reduces capital expenditure by avoiding the cost of physical infrastructure, data centers, and maintenance. Cloud-based DRaaS (Disaster Recovery as a Service) offers scalability, resilience, and cost efficiency aligned with an OPEX model.

Other options:

A and B are security and software lifecycle tasks, not cost-effective DR strategies.

D increases CAPEX by building and maintaining additional infrastructure.

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D (EoMPLS - Ethernet over MPLS):EoMPLS allows Layer 2 extension across MPLS without IP addressing or routing changes, preserving VLANs and broadcast domains — ideal for extending CCTV networks transparently.

Other options explained:

A: GRE encapsulates Layer 3, requiring IP configurations.

B: L2TPv3 is possible but not common over MPLS SP networks.

C: VXLAN is more suited for data center overlays, not WAN/MPLS integration.

When multiple virtualized network zones (such as VRFs, virtual firewalls, or logical partitions) are consolidated onto a single physical device, the primary concern is:

A (Fate sharing): A single hardware failure, software crash, or resource exhaustion event could simultaneously impact all virtualized zones, creating a shared risk across multiple otherwise isolated services.

Other options explained:

B: CPU resource allocation can be controlled via resource management but is not the primary risk.

C: Congestion control is typically a traffic engineering issue, not a virtualization risk.

D: Security isolation can be maintained through proper virtualization boundaries.

E: Bandwidth can be managed through QoS and resource allocation.

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A (MSDP - Multicast Source Discovery Protocol):MSDP allows different autonomous systems to share multicast source information while maintaining their own PIM Sparse Mode domains. It simplifies interdomain multicast routing without requiring full mesh peering or shared RPs between domains.

Other options explained:

B: SSM does not require MSDP but limits use to source-specific groups.

C: MPLS is a transport technology, not multicast control-plane solution.

D: PIM-SM is used within a domain, not across multiple autonomous systems.

In most Cisco NAT implementations:

Local-to-global NAT translations occur before policy-based routing (PBR), meaning that NAT happens first, and then PBR decisions are made based on the translated addresses.

This sequence is important when designing overlapping address spaces, as NAT must be applied before routing policies can correctly forward traffic based on global addresses.

Other options explained:

A: Incorrect sequence.

B/D: Global-to-local translations occur during inbound processing but not in the order described relative to PBR.

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A (Additional MPLS provider):True path diversity includes provider diversity to eliminate the possibility of shared failures within a single provider’s infrastructure. Multiple providers minimize correlated failures, increasing WAN availability.

Other options explained:

B: Out-of-band management improves operational access but doesn ' t address WAN availability.

C: Dual-homing branches is valuable but not directly related to the data center’s WAN failure condition.

D: Hardware redundancy improves local device availability but doesn ' t mitigate WAN failures.

B (OpenConfig):OpenConfig YANG models are vendor-neutral, community-driven standards designed to simplify multi-vendor network automation and interoperability — ideal for heterogeneous SDN fabrics.

Other options explained:

A: Proprietary models limit flexibility and interoperability.

C: Native models are vendor-specific.

D: IETF YANG models exist but are not as comprehensive for full operational SDN automation as OpenConfig.

A (Policy-based routing):Allows classification of traffic based on source, destination, or protocol and applies forwarding policies accordingly, such as sending VoIP over MPLS and best-effort traffic over either link. PBR operates in fast-path switching modes to avoid process switching if properly configured.

Other options explained:

B: Virtual links relate to OSPF, not traffic steering.

C: Visualization is not a network forwarding technology.

D: Floating static routes select one link for all traffic, not per-traffic-type control.

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.

In a DMVPN (Dynamic Multipoint VPN) design:

One site (here, Chicago) functions as the Next Hop Server (NHS), which facilitates dynamic spoke-to-spoke tunnel establishment.

DMVPN is based on multipoint GRE tunnels combined with NHRP (Next Hop Resolution Protocol).

The ability to detect remote tunnel endpoint failures is essential for reliable routing convergence and tunnel restoration.

While GRE (Option C) is the encapsulation mechanism used in DMVPN, it does not inherently provide failure detection. Likewise, VPLS and L2TPv3 are Layer 2 VPN technologies and not applicable in DMVPN design.

To meet the requirement of peer failure detection, the correct mechanism is:

B. IP SLA (Service-Level Agreement): This is a feature that actively monitors the health and reachability of tunnel endpoints through periodic probes (e.g., ICMP echo). When the peer becomes unreachable, routing protocol adjacencies can be withdrawn, and alternate paths selected.

Using IP SLA in a DMVPN design helps detect endpoint failure scenarios such as:

A spoke going down unexpectedly

Loss of return traffic

Partial link failures

This design pattern is aligned with CCDE v3.1 " Protocol Design Implications " , emphasizing resiliency, fault detection, and efficient routing convergence in overlay VPN designs like DMVPN.