CCDE 400-007 Exam Dumps

Virtual Private LAN Service (VPLS) provides Layer 2 VPN connectivity over MPLS. Each Provider Edge (PE) device must learn and maintain MAC addresses per virtual instance.

PE Scalability is the primary concern: With 2000 VLANs, each PE participating in those instances must maintain a large forwarding table and handle associated control-plane activity.

MAC learning and aging, along with full-mesh label-switched paths (LSPs), place a heavy burden on CPU and memory.

Flooding (A) is expected but not the primary concern; it’s a symptom of scale.

The underlying transport (C) and VLAN ID limits (D) are important but not as critical in the context of PE resource scalability.

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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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In Cisco Wireless Guest Anchor deployments, traffic between foreign and anchor controllers is typically tunneled using CAPWAP (Control and Provisioning of Wireless Access Points).

The CAPWAP tunnel operates over IP and can traverse MPLS VPN or VRF-Lite Layer 3 segmentation to maintain logical separation across different segments or geographic sites.

This allows end-to-end isolation of guest traffic from the enterprise network into the DMZ anchor location, as shown in the diagram.

Why other options are incorrect:

B: Unencapsulated traffic would expose guest traffic inside the enterprise network.

C: EoIP is not a standard Cisco wireless tunneling method.

D: IPinIP or IPsec tunnels are not typically used between WLCs for guest anchor tunneling.

SDN controller — Maintains a complete view of everything that is happening in the network; Manifested as either a physical or virtual component

Southbound interface — Communicates with network devices to program the data plane; Provides access to the network to configure or to retrieve information from it

Northbound interface — Exposes access to the controller; Characterized as a software interface