Traffic Classification and Marking Issues refer to problems that occur when network traffic is incorrectly identified or labeled within QoS configurations. These issues arise when classification rules fail to accurately detect application types, protocols, or traffic patterns. Incorrect marking, such as wrong DSCP or CoS values, can lead to improper prioritization of data packets. This results in degraded performance for critical services like voice, video, and real-time applications. Network administrators analyze QoS policies, inspection rules, and device configurations to identify inconsistencies. Resolving these issues ensures accurate traffic handling, improved bandwidth utilization, and consistent network performance in enterprise environments.