300-620 · Question #129
A Cisco ACI bridge domain and VRF are configured with a default data-plane learning configuration. Which two endpoint attributes are programmed in the leaf switch when receiving traffic? (Choose two.)
The correct answer is A. Remote MAC, IP D. Local MAC, IP. When a Cisco ACI leaf switch receives traffic, it learns and programs both the local MAC and IP addresses for directly connected endpoints and the remote MAC and IP addresses for endpoints located on other leaf switches within the fabric. These attributes are essential for…
Question
A Cisco ACI bridge domain and VRF are configured with a default data-plane learning configuration. Which two endpoint attributes are programmed in the leaf switch when receiving traffic? (Choose two.)
Options
- ARemote MAC, IP
- BRemote Subnet
- CLocal IP, not MAC
- DLocal MAC, IP
- ELocal Subnet
- FRemote IP
How the community answered
(32 responses)- A91% (29)
- B3% (1)
- C3% (1)
- E3% (1)
Why each option
When a Cisco ACI leaf switch receives traffic, it learns and programs both the local MAC and IP addresses for directly connected endpoints and the remote MAC and IP addresses for endpoints located on other leaf switches within the fabric. These attributes are essential for forwarding decisions and policy enforcement.
When a leaf switch receives VXLAN encapsulated traffic from another leaf via the fabric, the inner header contains the MAC and IP address of the source endpoint which is considered a remote endpoint to the receiving leaf, and these attributes are programmed as remote MAC and IP.
Subnets are network configurations, not direct attributes learned from individual endpoint traffic flow in the same way MAC and IP addresses are; ACI learns specific endpoint IP addresses.
The leaf learns both the local IP and MAC address for directly connected endpoints, so stating 'not MAC' makes this choice incorrect.
When a leaf switch receives traffic directly from an endpoint connected to one of its access ports, it learns the endpoint's MAC address and IP address, which are then programmed as local attributes in the leaf's endpoint table.
Subnets are network configurations, not direct attributes learned from individual endpoint traffic flow in the same way MAC and IP addresses are; ACI learns specific endpoint IP addresses.
While remote IP is learned, the question asks for two attributes and also learns the remote MAC; this choice is incomplete compared to A which combines both MAC and IP.
Concept tested: ACI endpoint learning attributes
Source: https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/sw/security/b-cisco-aci-security-config-guide-501/m-endpoint-learning.html
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