Which of the following uses a set of rules that filter network traffic and can be configured on network devices with packet filtering capabilities?

Access control lists (ACLs) are lists of permissions that define what traffic is allowed or denied on a network. They are implemented on routers and firewalls to filter packets based on criteria such as IP addresses, protocols, and port numbers. These rules help manage network security by controlling which traffic can flow through a network device and to which destinations.

ACLs are essential for network management, as they determine how data packets are handled by devices, making them a fundamental part of network security architecture. By applying ACLs, network administrators can enforce security policies and protect networks from unauthorized access and various threats.

The other options, while related to network security, do not specifically involve rule-based packet filtering in the same manner as ACLs. Next-gen firewalls incorporate more advanced functions like deep packet inspection and application awareness, but they also work alongside or use ACLs. NetFlow is primarily used for traffic analysis and monitoring rather than filtering, and web content filtering focuses on restricting access to certain web content, usually based on URLs or keywords, rather than filtering packets based on defined rules.