An allow list, formerly known as whitelisting, explicitly permits known and trusted entities to access a network, while implicitly denying all others. It is an effective way to control ingress and egress traffic, minimizing exposure to malicious or unnecessary traffic and enhancing the security posture of the cloud environment. While blocking suspect ports can reduce the attack surface, it is not the primary goal of an allow list. Similarly, analyzing traffic pattern behavior is related to network monitoring rather than the primary function of allow lists. Randomizing ports is a security practice unrelated to the concept of traffic listing.