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

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.

IPFIX probes can perform deep flow inspection beyond what routers/switches natively collect, making them well suited for security monitoring (DDoS detection, anomaly detection, intrusion attempts).

Probes can extract Layer 7 information unavailable from normal router flow records.

Why other options are incorrect:

A, C, D: Can also be done using router-integrated flow exports; dedicated probes are primarily deployed for advanced security visibility.

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MLD (Multicast Listener Discovery) snooping for IPv6 operates similarly to IGMP snooping in IPv4. It tracks listener reports to restrict multicast flooding within a Layer 2 domain.

C: Querier elections are triggered when a querier becomes unreachable or its IP address changes.

D: The querier with the lowest IPv6 address is elected as the active querier, which manages report/query communication.

Other options:

A: QoS is not automatically enabled with MLD snooping.

B: MLD querier functionality operates per VLAN—not per group—so only one querier is elected per VLAN.

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B (Software as a Service - SaaS):SaaS provides end users with complete applications hosted and managed by third-party providers, accessed via web interfaces.

Other options explained:

A: PaaS provides platforms for application development, not complete applications.

C: IaaS provides compute/storage resources but not full applications.

D: WaaS (Workspace as a Service) is a niche model, not generally used as standard SaaS definition.

Reducing BGP keepalive and hold timers can help improve convergence but must be done carefully in provider-managed networks:

A: The service provider must agree to support modified timers on both PE and CE; otherwise, mismatched timer settings can break neighbor relationships.

C: The service provider may need to schedule configuration changes on PE routers to synchronize the timer adjustments and avoid service interruptions.

Why other options are incorrect:

B: Peer groups simplify policy application but do not impact BGP timers directly.

D: The number of routes affects convergence processing but not directly tied to timer adjustment.

E: The number of VRFs is a scalability consideration but unrelated to BGP timer negotiation.

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C (PIM Sparse Mode with RP located at the hub):DMVPN networks typically leverage sparse mode multicast due to their efficiency in dynamic topologies. Locating the Rendezvous Point (RP) at the hub simplifies multicast state management, since the hub serves as the central aggregation point and ensures optimal rendezvous functionality without requiring complex RP placement across spokes.

Other options explained:

A: Dense mode is inefficient and generates unnecessary flooding, especially in WAN environments.

B/D: Placing RPs at remote sites introduces unnecessary complexity and operational challenges.

B (Dynamic real-time change):SDN must adapt dynamically as network demands and application requirements evolve.

E (Integration of device context):Understanding device-level status, capabilities, and resource availability allows controllers to make informed decisions, reducing visibility gaps.

Other options explained:

A: On-demand growth is a business benefit but not related to visibility/performance gaps.

C: Reverting to legacy behaviors undermines SDN benefits.

D: Peer-to-peer controllers help scale, but not directly tied to visibility gaps.

Cisco FabricPath is a Layer 2 multipath technology that blends traditional Layer 2 Ethernet with routing technologies to enable loop-free forwarding and scalability. Two critical mechanisms used to mitigate loops:

C. RPF (Reverse Path Forwarding) Check: FabricPath applies a reverse path forwarding check, similar to multicast, to verify the source of a frame and discard duplicates arriving on unexpected paths.

D. TTL Header: FabricPath adds a Time-To-Live (TTL) field to Layer 2 frames, which is not present in traditional Ethernet. This prevents indefinite circulation of frames by limiting their lifetime in the network—much like in IP.

These elements allow FabricPath to prevent broadcast storms and loops in multipath Layer 2 topologies, addressing legacy STP limitations with efficient loop-avoidance methods.

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