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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 326

Company XYZ, a global content provider, owns data centers on different continents. Their data center design involves a standard three-layer design with a Layer 3-only core. HSRP is used as the FHRP. They require VLAN extension across access switches in all data centers, and they plan to purchase a Layer 2 interconnection between two of their data centers in Europe. In the absence of other business or technical constraints, which termination point is optimal for the Layer 2 interconnection?

Correct Answer: B
In a standard 3-tier data center architecture (access, aggregation, core), the Layer 2-to-Layer 3 boundary typically resides at the aggregation layer. When extending VLANs between data centers using a Layer 2 interconnection, the most optimal and scalable termination point is at the aggregation layer because:
* It naturally handles VLAN demarcation and Layer 3 boundary.
* Spanning Tree Protocol (STP) domains remain contained within local aggregation blocks.
* The core remains Layer 3-only, ensuring scalability, stability, and no STP involvement.
* Simplifies traffic engineering, FHRP operations, and minimizes control-plane complexity across sites.
This design is consistent with CCDE v3.1 best practice where VLAN extension is isolated to aggregation to avoid STP scaling issues and maintain hierarchical design principles.
Why other options are incorrect:
* A: STP isolation can still be achieved at aggregation while keeping the core Layer 3.
* C: Access layer extensions would increase STP scope and complexity unnecessarily.
* D: Core termination violates Layer 3 core design, bringing STP into the core, which is not scalable.
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Question 327

The network designer needs to use GLOP IP addresses in order to make them unique within their ASN Which multicast address range should be used?

Correct Answer: A
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Question 328

Which network management framework can be used to develop a network architecture that contains business requirements analysis, gap analysis, and network diagrams as artifacts to be used for design and implementation later?

Correct Answer: B
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Question 329

Refer to the exhibit.

An engineer is designing the traffic flow for AS 111. Traffic from AS 111 should be preferred via AS 100 for all external routes. A method must be used that only affects AS 111. Which BGP attributes are best suited to control outbound traffic?

Correct Answer: B
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Question 330

You want to split an Ethernet domain in two.
Which parameter must be unique in this design to keep the two domains separated?

Correct Answer: A
To split an Ethernet domain and ensure isolation of configuration and topology changes, the key mechanism is separating the VLAN management domains. This is achieved through:
* VTP (VLAN Trunking Protocol) domain separation
Each VTP domain controls its own set of VLAN information and will not propagate VLAN changes across domain boundaries. By assigning unique VTP domain names to each half of the network, administrators prevent unintended synchronization of VLANs between switches.
Other options:
* B. VTP password: Adds security but does not separate domains.
* C. STP type: All switches in the domain can run the same or different STP versions and still be part of the same Ethernet domain.
* D. VLAN ID: These can overlap across domains; uniqueness is not required to split domains.
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