Which packet information can be used for complex traffic classification?

Using source and destination addresses for complex traffic classification is highly effective because these addresses are crucial in determining the origin and destination of network traffic. They provide context about which devices are communicating and can indicate the type of application or service being used and the traffic's source or destination. This contextual information allows network administrators to effectively categorize and manage traffic flowing through a network, facilitating quality of service (QoS) measures, security policies, and traffic engineering.

Additionally, classification based on addresses can support various advanced functions, such as inserting rules for specific applications or protocols that might otherwise not be easily distinguished when only considering other factors, like packet size or protocol type alone. This results in a more nuanced understanding of network behavior and application performance, which is essential for maintaining optimal network operations and troubleshooting issues.