In network traffic analysis, which of the following is relevant data?

The size and duration of communications in network traffic analysis provide valuable insights into the behavior and patterns of network usage. This information can help identify anomalies or irregular traffic that may suggest security incidents or network issues. For instance, a sudden spike in the size of data packets or an unusually long duration of a communication session may indicate an attempted data breach or a denial-of-service attack. Analyzing these parameters aids in capacity planning, resource allocation, and threat detection, making them crucial for understanding network performance and security.

The other types of data mentioned are also important in different contexts; however, the size and duration specifically give a clear, measurable view of how data is flowing through the network and can be directly correlated with many common network issues or security threats.