Aakash Tiwari enhanced the ACL testing framework in the sonic-net/sonic-mgmt repository, focusing on improving the reliability of network policy validation. He implemented pre-validation checks using Python to ensure that ACL rules are active and that the ACL table exists before any traffic validation occurs. By introducing new verification utilities, he enabled automated confirmation of both ACL table presence and rule status, which helps reduce flaky tests and accelerates early detection of configuration issues. His work leveraged skills in networking and testing, resulting in a more robust and maintainable testing process for validating security policies within the codebase.