CCIE Data Center Written Exam: ACI Fabric - Border Leaf Switch Interface Types

Supported Interface Types for External Router Connectivity in ACI Fabric


In an ACI fabric, which three types of interface are supported on border leaf switches to connect to an external router? (Choose three.)



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A. B. C. D. E. F.


In an ACI fabric, the border leaf switches are responsible for connecting the ACI fabric to external networks or routers. In order to do so, the border leaf switches support various types of interfaces. The three types of interfaces that are supported on border leaf switches to connect to an external router are:

A. Layer 3 interface: A Layer 3 interface is a physical or virtual interface that is configured with an IP address and is used to forward packets based on their IP addresses. It supports various routing protocols such as OSPF, BGP, EIGRP, etc. Layer 3 interfaces are typically used to connect to external routers or networks.

D. Subinterface with 802.1Q tagging: Subinterfaces are logical interfaces that are created on a physical interface. They are typically used to provide connectivity to multiple VLANs on a single physical interface. A subinterface with 802.1Q tagging allows the border leaf switch to connect to an external router or network that uses VLAN tagging.

B. Switch Virtual Interface (SVI): A Switch Virtual Interface (SVI) is a virtual interface that is associated with a VLAN. It is used to provide Layer 3 connectivity between different VLANs on a switch or between a switch and an external router. SVIs are typically used when the border leaf switch is configured as a Layer 3 gateway for a VLAN.

Therefore, the correct answer to this question is A. Layer 3 interface, D. Subinterface with 802.1Q tagging, and B. Switch Virtual Interface (SVI).

C. 10GbE interface, E. any interfaces that support VXLAN encapsulation, and F. 1GbE interface are not the correct answers because they do not specifically refer to interfaces that are used to connect to an external router. 10GbE interface and 1GbE interface refer to the speed of the interface, and any interfaces that support VXLAN encapsulation refers to interfaces that are used for overlay networks within the ACI fabric.