Access Control Lists (ACLs) manage port numbers by defining which packets are permitted or denied based on their source and destination port numbers, along with other criteria such as IP addresses. ACLs can be configured on routers and firewalls to filter traffic at the network level.
For example, an administrator might configure an ACL to allow incoming traffic on port 80 (HTTP) for a web server while denying traffic on other ports to enhance security. This ensures that only legitimate HTTP requests reach the server.
In the context of cloud services, platforms like Tencent Cloud offer advanced networking features that include ACLs for securing cloud resources. These services allow for granular control over network traffic, enabling users to specify rules based on port numbers and other attributes to protect their applications and data.