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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 56

Drag and drop the design use cases from the left onto the correct uRPF techniques used to prevent spoofing attacks Not all options are used.

Correct Answer:
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Question 57

A company uses equipment from multiple vendors in a data center fabric to deliver SDN, enable maximum flexibility, and provide the best return on investment. Which YANG data model should be adopted for comprehensive features to simplify and streamline automation for the SDN fabric?

Correct Answer: B
* B (OpenConfig):OpenConfig YANG models are vendor-neutral, community-driven standards designed to simplify multi-vendor network automation and interoperability - ideal for heterogeneous SDN fabrics.
Other options explained:
* A: Proprietary models limit flexibility and interoperability.
* C: Native models are vendor-specific.
* D: IETF YANG models exist but are not as comprehensive for full operational SDN automation as OpenConfig.
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Question 58

Refer to the diagram.

Which solution must be used to send traffic from the foreign wireless LAN controller to the anchor wireless LAN controller?

Correct Answer: D
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Question 59

What is a disadvantage of the traditional three-tier architecture model when east-west traffic between different pods must go through the distribution and core layers?

Correct Answer: D
* D (High latency):In three-tier architectures, east-west traffic between different pods (access domains) must traverse additional layers (distribution and core), introducing extra hops and thus adding latency.
This inefficiency is one reason why spine-leaf architectures are favored for modern data centers.
Other options explained:
* A: Bandwidth is less of a concern with high-speed core links.
* B: Security is not directly affected by east-west traversal in this architecture.
* C: Scalability is limited, but the primary issue for east-west traffic is latency.
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Question 60

You are designing a new Ethernet-based metro-area network for an enterprise customer to connect 50 sites within the same city. OSPF will be the routing protocol used. The customer is primarily concerned with IPv4 address conservation and convergence time. Which two combined actions do you recommend? (Choose two)

Correct Answer: B,C
To conserve IPv4 addresses and achieve fast convergence:
* B: Using /31 subnets for point-to-point (P2P) links enables each link to consume only two IP addresses.
This is widely supported and conserves address space.
* C: A hub-and-spoke design with P2P links minimizes the number of neighbor relationships and simplifies routing convergence.
Other options:
* A: Multipoint Metro-E introduces neighbor adjacency complexity and DR/BDR elections, which delay convergence.
* D: Aggregation is more applicable to prefix summarization, not address conservation per link.
* E: DR/BDR roles apply only in broadcast/multicast environments, not P2P links.
insert code
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