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

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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

B (Cloud OnRamp for IaaS):This allows certain applications to have direct optimized access to public cloud resources while other enterprise traffic remains centralized. OnRamp for IaaS provides dynamic path selection and policy control based on application behavior and performance.

Other options explained:

A: MPLS L3VPN does not offer cloud-optimized direct access.

C: SaaS OnRamp is for SaaS applications, not IaaS workloads.

D: Direct Connect links to the cloud but lacks policy-driven traffic engineering.

When unmanaged switches are connected to access ports, there's a risk that they may start participating in Spanning Tree Protocol (STP) or introduce loops. BPDU Guard is the most effective mechanism to mitigate this risk:

BPDU Guard disables a port immediately upon receiving any BPDU, ensuring that only end hosts (non-switch devices) are connected to access ports.

This protects the stability of the STP topology by preventing accidental or malicious introduction of switches into the Layer 2 domain.

Other options explained:

A (PortFast): Accelerates port transition to forwarding state but does not protect against loops caused by BPDUs.

B (UDLD): Detects unidirectional physical link failures but not STP participation.

C (Root guard): Prevents the connected device from becoming a root bridge but still allows BPDUs.

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TOGAF (The Open Group Architecture Framework) provides a full enterprise architecture methodology including:

Business requirements gathering

Gap analysis

Architecture modeling

Comprehensive design documentation

TOGAF is widely referenced in CCDE v3.1 for high-level architecture development.

Why other options are incorrect:

B (ITIL): Focuses on service management, not architecture design.

C (FCAPS): Defines network management functional areas.

D (COBIT): Focuses on governance and compliance, not design frameworks.

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A (Focus on the solution instead of the problem): While resolving issues quickly is important for operations, solution-oriented thinking during the design phase may overlook essential requirements analysis. Design decisions must be based on problem understanding, traffic analysis, and actual network behavior.

Other options explained:

B, C, D: All directly impact WAN design by influencing QoS, capacity planning, flow optimization, and visibility.

A (EIGRP summarization):Summarization reduces unnecessary routing information exchange, simplifies the routing table, and improves convergence.

D (Route leaking on London-Rome link):Route leaking allows specific prefixes (such as important routes for direct communication) to be advertised across the London-Rome link, ensuring it's utilized where appropriate.

Other options explained:

B: Filtering routes on Barcelona would prevent reachability unnecessarily.

C: Filtering on London-Rome link would prevent its usage entirely.

In the design ofIPv6 multicast services, particularly usingPIM Sparse Mode, thefirst-hop router(which is connected to the multicast source) must register the multicast source with theRendezvous Point (RP). This registration involves encapsulating the multicast packets in unicast messages and sending them to the RP.

This encapsulation is done over adynamically created tunnel interface, typically referred to as aPIM Register Tunnel. This temporary tunnel is established by the source-side router to send encapsulated multicast traffic to the RP for initial source registration.

Therefore, the dynamic tunnel serves the purpose of:

Encapsulating and sending the first multicast packets from the source to the RP

Allowing the RP to learn about new sources and initiate shared tree or shortest-path tree forwarding

This operation aligns with CCDE v3.1 design principles, where understanding the internal operation of multicast protocols—especially source registration and RP role—is critical for scalable and reliable multicast service delivery.

Why other options are incorrect:

A: First-hop router doesn’t register itself, it registers thesourceto the RP.

B: Clients (receivers) do not register to the RP; they send IGMP/MLD joins which flow toward the RP.

D: Not all IPv6 multicast traffic is transported via tunnels; only initial registration traffic is encapsulated in this manner.

This mechanism is essential for source discovery in sparse-mode multicast and is foundational to multicast tree building in IPv6 networks.

C: MPLS TE (Traffic Engineering) is designed to optimize IP traffic flow by considering bandwidth constraints, delay sensitivity, and administrative policy. It enables operators to steer traffic based on defined metrics rather than pure shortest-path IGP routes.

Other options:

A: MPLS TE can coexist with LDP and still rely on IGP for link-state info; it does not replace LDP.

B: MPLS TE by itself doesn’t provide protection; it requires Fast Reroute (FRR) mechanisms like link/node protection extensions.

D: MPLS TE is independent of VPN topology; it can operate without requiring a full-mesh of Layer 3 VPNs.

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Cisco NFVi (Network Function Virtualization Infrastructure) solutions integrate with Red Hat’s virtualization stack using:

C. Cisco Nexus switches: Provide data center network fabric.

D. Cisco UCS: Provides the compute platform for NFV workloads.

F. Cisco Virtual Network Functions: The software-based network functions running on NFVi (e.g. virtual routers, firewalls, etc.).

Why other options are incorrect:

A: Cisco Prime Service Catalog is a management tool, not part of NFVi infrastructure.

B: Cisco Open vSwitch is not a Cisco product (Open vSwitch is open-source).

E: Cisco Open Container Platform is not part of the NFVi reference solution in conjunction with Red Hat.

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