An engineer has been requested to utilize a method in an ACI network that will ensure only permitted communications are transmitted between each End Point Group tier in a three tier application. Which element would be utilized to accomplish this within the fabric?
A. Filter
B. Contract
C. Label
D. Subject
the Contract is the correct anwser.
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/aci-fundamentals/b_ACI-Fundamentals/b_ACI-Fundamentals_chapter_010001.html
B is correct answer