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  1. Home
  2. Cisco Certification
  3. 400-007 Exam
  4. Cisco.400-007.v2025-12-06.q401 Dumps
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Question 101

An engineer must design a network for a company that uses OSPF LFA to reduce loops. Which type of loop would be reduced by using this design?

Correct Answer: B
* B (Micro loops):OSPF Loop-Free Alternates (LFA) pre-calculate backup next-hops to reduce transient micro loops during the convergence process when primary routes fail.
Other options explained:
* A: DTP relates to trunk negotiation, not loop prevention.
* C: STP handles Layer 2 loops.
* D: REP is a Cisco Layer 2 redundancy protocol, unrelated to OSPF loop prevention.
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Question 102

An enterprise wants to provide low-cost delivery of network systems that can be scaled on business demand, followed by an initiative to reduce capital expenses for new IT equipment. Which technology meets these goals?

Correct Answer: A
* A (IaaS within a private cloud):IaaS allows on-demand scaling of compute and storage resources, and private cloud deployment reduces capital expenditures by pooling hardware resources and increasing utilization, while allowing control over security and compliance.
Other options explained:
* B: On-prem IaaS still requires significant CapEx.
* C: PaaS delivers platform services, but the scenario is focused on network systems.
* D: SaaS on-prem is uncommon and does not address infrastructure scaling.
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Question 103

SDN is still maturing. Throughout the evolution of SDN, which two things will play a key role in enabling a successful deployment and avoiding performance visibility gaps in the infrastructure? (Choose two.)

Correct Answer: B,E
* 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.
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Question 104

Which BGP feature provides fast convergence?

Correct Answer: C
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Question 105

Which optimal use of interface dampening on a fast convergence network design is true?

Correct Answer: B
Interface dampening is primarily designed to suppress rapid, repetitive interface flaps (high-frequency short- duration flaps), which can cause instability in routing protocols and excessive reconvergence events.
* When many brief interface failures happen, dampening delays the routing protocol's reaction until the interface remains stable.
* This helps prevent control-plane churn in fast-converging designs.
This approach is emphasized in CCDE v3.1 design principles where balance between stability and convergence is required.
Why other options are incorrect:
* A: Occasional long-duration flaps don't require dampening.
* C & D: Hardware speed mismatches are better handled by carrier-delay or debounce-timer mechanisms, not dampening.
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