400-007 Exam Dumps : CCDE written exam

Agile project management supports:

Frequent updates and iterative feedback loops

Flexibility to accommodate evolving requirements

Continuous customer collaboration and transparency

This methodology is ideal for projects where scope may shift and customer involvement is essential. In contrast:

Waterfall is linear and rigid

Phased delivery segments milestones but limits change midstream

“Three principles” is not a recognized methodology in this context

Agile aligns with modern IT deployment models and is supported in CCDE methodology as a business-aligned and adaptive design execution strategy.

D (LISP — Locator/ID Separation Protocol):

Supports massive scale with centralized control plane (mapping servers).

CE routers do not run routing protocols with PE.

Allows load balancing and multi-homing using locator sets.

Supports IPv4 and IPv6.

Lightweight CE requirements fit low-cost platforms.

Why other options are incorrect:

A: FlexVPN is control-plane intensive and less scalable for large managed CE deployments.

B: Point-to-point GRE doesn ' t scale well with 250,000 CEs.

C: DMVPN requires routing protocol overlays which violate the requirement.

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.

—