Free Cisco 400-007 Practice Exam with Questions & Answers | Set: 2

B (Reduce config complexity):Central controllers abstract policies, simplifying configuration.

C (Centralized IT functions):Controllers centralize management, automation, analytics, and assurance.

Other options explained:

A: Licensing varies but not universally inflated.

D: Failures are dependent on hardware design, not controller presence.

E: SDN does not inherently increase bandwidth usage.

Transparent Interconnection of Lots of Links (TRILL) is an IETF standard specifically designed to improve scalability, convergence, and loop prevention in data center environments while supporting virtualization at scale. TRILL replaces traditional Spanning Tree Protocol (STP) with a shortest path forwarding protocol, combining the benefits of routing with the simplicity of bridging.

TRILL uses IS-IS as its control plane protocol to calculate optimal paths dynamically, enabling better bandwidth utilization and faster failover—critical for server virtualization that demands highly available, resilient, and scalable Layer 2 networks.

Why other options are incorrect:

A. Data Center Bridging (DCB) is a set of enhancements for Ethernet but doesn’t directly address virtualization scaling.

B. Unified Fabric combines storage and data traffic but is not IETF standardized and focuses on cabling consolidation.

D. FabricPath is Cisco proprietary, not IETF standard.

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A picture containing table Description automatically generated

IPv4:

Host Registration - IGMP

Router Registration - PIM-DM, PIM-SM, SSM, BIDIR

Inter-Domain Source Discovery - MSDP

IPv6:

Host Registration - MLD

Router Registration - PIM-SM, SSM, BIDIR

Route Distinguishers (RDs) are fundamental to MPLS Layer 3 VPN architecture (RFC 4364). They allow the service provider to distinguish identical IP prefixes from different VPN customers by adding a unique identifier to each VPN route, preventing conflicts from overlapping IP spaces.

Unique RDs ensure that the VPNv4 address family maintains separation of identical customer prefixes.

Why other options are incorrect:

B: Route Targets control route import/export policy but do not differentiate overlapping prefixes.

C: NAT is not required inside MPLS VPN for overlapping IPs.

D: VRF IDs are local identifiers on routers; not relevant for prefix uniqueness in control plane.

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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.

B: Setting a higher minimum data rate reduces airtime consumption from low-speed clients, improving overall capacity.

D: Utilizing 5 GHz reduces contention on the heavily congested 2.4 GHz band, allowing better spectral efficiency in high-density environments.

Why other options are incorrect:

A: 2.4 GHz only supports 3 non-overlapping channels; 4-channel design introduces interference.

C: Excessive SSIDs increase management overhead and beacon traffic.

E: Channel bonding in 2.4 GHz is discouraged in high-density deployments due to channel overlap and interference.

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