Exam 300-620 topic 1 question 22 discussion

A. enable Limit IP Learning to Subnet

Limit IP Learning to Subnet: This option is similar to a unicast reverse-forwarding-path check. If this option is selected, the fabric will not learn IP addresses from a subnet other than the one configured on the bridge domain. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/2-x/L2_config/b_Cisco_APIC_Layer_2_Configuration_Guide/b_Cisco_APIC_Layer_2_Configuration_Guide_chapter_010.pdf

A is correct: Select the option "Limit Local Learning To BD/EPD Subnet(s): Limits IP address learning to the bridge domain subnets only. Every BD can have multiples subnets associated with it. By default, al IPs are learned.

Limit IP Learning to Subnet - This option does not prevent remote IP endpoint learning. Enforce Subnet Check - Limits both local and remote endpoint learning to instances only when the source IP address belongs to a bridge-domain subnet in the VRF instance Note: Neither the built-in prevention mechanism for second-generation leaf switches nor the Enforce Subnet Check feature is available on first-generation leaf switches. Instead, you can configure the Limit IP Learning To Subnet option and the Disable Remote EP Learn option on the border leaf. Refer to the section discussing each feature to learn the differences between the features. https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739989.html

Fabric operations, we recommend configurations that cause ACI to only learn IP addresses, which are configured on a BD Subnet https://www.cisco.com/c/dam/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/aci-endpoint-learning.pdf

A work friend passed using these questions about six weeks ago, he said to keep an eye out for new ones.

Any new exam takers? Is this still valid? I heard that Cisco Data Center certification is getting some revisions.