350-601 Question #492: Real Exam Question with Answer & Explanation

Question

An engineer builds a new Cisco ACI fabric. Which VLAN must be configured as the infrastructure VLAN during the Cisco APIC setup script?

Options

• Aa unique in-band management VLAN
• Ba unique native VLAN
• Ca unique OOB management VLAN
• Da unique VLAN within the network

Explanation

When building a new Cisco ACI fabric, the APIC setup script requires a specific VLAN to be configured as the infrastructure VLAN. This VLAN must be unique within the network to ensure proper fabric operation.

Common mistakes.

• A. While in-band management might use a VLAN, the infrastructure VLAN has a specific role for fabric discovery and internal communication that goes beyond just management traffic; it's a fundamental fabric identifier.
• B. A native VLAN is typically associated with untagged traffic on a trunk port, and while VLANs are involved, the infrastructure VLAN is a tagged VLAN with a specific purpose for fabric communication, not simply a native VLAN.
• C. OOB (out-of-band) management VLANs are used for direct management of devices independently of the data plane, which is different from the fabric's internal infrastructure communication VLAN.

Concept tested. Cisco ACI infrastructure VLAN requirements

Reference. https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/config/cisco-aci-config-guide-501/cisco-aci-config-guide-501_chapter_010.html#concept_E77F322D16774DBFA1C98B6D36C5611B

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