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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 306

Which design benefit of bridge assurance is true?

Correct Answer: D
Bridge Assurance is a mechanism used with Rapid PVST+ and MST that helps prevent loops caused by unidirectional failures on point-to-point links. When enabled, both ends of a point-to-point STP link must continuously exchange BPDUs. If one side stops receiving BPDUs, the port transitions into a blocking state, preventing loops caused by silent failures.
* This directly addresses unidirectional link failures that otherwise may not be detected quickly by traditional STP timers.
* It is typically deployed between switches in the core and distribution layers, where point-to-point links exist.
Other options explained:
* A: Incorrect - STP TCNs are not triggered simply by station connection events.
* B: Incorrect - Path optimization is handled by STP/RSTP convergence, not bridge assurance directly.
* C: Incorrect - Bridge assurance is not designed for unmanaged switches at the access layer.
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Question 307

How can EIGRP topologies be designed to converge as fast as possible in the event of a point-to-point link failure?

Correct Answer: D
EIGRP's convergence time is heavily impacted by the size of the query domain - the group of routers involved when a route goes into active state. The larger the query domain, the longer the convergence.
Summarization naturally bounds query propagation because routers receiving a summary have no knowledge of individual prefixes beyond that summary, preventing them from being queried about specifics they don't track.
This design technique is emphasized in CCDE v3.1 because:
* Summarization reduces the query scope.
* Faster convergence happens as fewer routers process queries.
* Hierarchical design is enabled for stability and scalability.
Why other options are incorrect:
* A: Distribute lists filter prefixes but don't reduce query propagation.
* B & C: Triangulated or squared physical topology doesn't control protocol-level query scope.
* E: Default routes may help limited routing domains but don't optimize EIGRP convergence specifically.
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Question 308

Which solution component helps to achieve comprehensive threat protection and compliance for migration to multicloud SDX architectures?

Correct Answer: D
* D (SASE - Secure Access Service Edge):SASE integrates networking and security functions (e.g., SD- WAN, firewall, CASB, ZTNA) into a single cloud-native service model, designed specifically for multicloud and distributed environments.
Other options explained:
* A/B/C: These do not represent industry-standard security frameworks like SASE.
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Question 309

An enterprise has identified these causes for inefficient CAPEX spending:
CAPEX planning is driven by technology and not by business objectives.
The CAPEX planning team lacks the data it needs to perform due diligence tasks.
The organizational structure lacks sufficient accountability and incentives.
Which corporate cultural change contributes to improving the effectiveness of CAPEX spending?

Correct Answer: A
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Question 310

Refer to the exhibit.

OSPF is running as the IGP to provide reachability to all AS100 networks R3 and R4 are the current ABRs at the boundary of OSPF Area0 and Areal Now BGP must be deployed within AS 100 because it will be receiving Internet routes from its eBGP peers (the service provider) connected to R1 and R2 What is an optimal solution for this deployment to configure BGP relationships and redistribute BGP learned routes into OSPF?

Correct Answer: A
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