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  2. Cisco Certification
  3. 400-007 Exam
  4. Cisco.400-007.v2025-12-06.q401 Dumps
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Question 346


Refer to the exhibit: A customer is migrating from a TDM-based Layer 2 VPN (L2VPN) to an MPLS Layer 3 VPN (L3VPN) in phases. The backbone OSPF connection between HUB A and HUB B will be replaced by eBGP. During the migration, some spokes (A2 and B1) are already moved to the L3VPN. The goal is to avoid routing loops during this hybrid transition.
Which design choice helps prevent routing loops during the backbone link migration?

Correct Answer: A
# Comprehensive Explanation:
* A: In hybrid WAN designs where routing domains are gradually migrating from OSPF to BGP, particularly with overlapping domains or redistribution points, loops can occur if the same routes are seen via multiple protocols (e.g., BGP and OSPF). Implementing route filtering on the OSPF backbone prevents it from learning and advertising spoke routes that it also receives via BGP-eliminating the loop scenario.
* B: Advertising a low administrative distance (AD) for transit traffic does not prevent loops and may worsen convergence or cause routing inconsistency.
* C: Summarizing OSPF routes may reduce the routing table size, but it does not solve the loop issue caused by dual protocol redistribution unless filtering is applied.
* D: Redistributing EIGRP routes into BGP with a low cost might cause preference toward one path but does not address the loop risk between the hybrid segments (OSPF and BGP).
This is a classic use case for route filtering in dual-protocol or dual-backbone migrations, where ensuring consistent path selection and loop prevention is essential.
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Question 347

Which two factors provide multifactor authentication for secure access to applications and data, no matter where the users are or which devices they are on? (Choose two.)

Correct Answer: A,E
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Question 348

The major business applications of an enterprise are largely monolithic and hard-coded As part of a major modernization and overhaul of the applications the goal is to move to a modular and containerized application architecture mode At the same time decoupling from the hardware is desired to move to an on-demand provisioning However the CyberOps team mandated that the final architecture must provide the same security levels as an air-gapped data center. Which cloud architecture meets these requirements?

Correct Answer: A
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Question 349

You have been tasked with designing a data center interconnect as part of business continuity You want to use FCoE over this DCI to support synchronous replication. Which two technologies allow for FCoE via lossless Ethernet or data center bridging? (Choose two.)

Correct Answer: B,E
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Question 350

Refer to the exhibit.

As part of a redesign project, you must predict multicast behavior What happens to the multicast traffic received on the shared tree (*,G), if it is received on the LHR interface indicated*?

Correct Answer: C
https://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/16450-mcastguide0.html When a multicast packet arrives on an interface, the RPF process checks to ensure that this incoming interface is the outgoing interface used by unicast routing in order to reach the source of the multicast packet. This RPF check process prevents loops. Multicast routing does not forward a packet unless the source of the packet passes a RPF check. Once a packet passes this RPF check, multicast routing forwards the packet based only upon the destination address.
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