In a Citrix NetScaler appliance, the Management CPU is responsible for handling management tasks such as configuration, monitoring, and reporting. On the other hand, the Packet Engine CPU is dedicated to processing network traffic, including tasks like load balancing, SSL offloading, and content switching.

The Management CPU is used for handling administrative tasks and does not directly impact the processing of network traffic. It is responsible for managing the configuration of the NetScaler appliance, monitoring its performance, and handling administrative tasks such as logging and reporting.

The Packet Engine CPU, on the other hand, is responsible for processing network traffic. It handles tasks such as load balancing, SSL offloading, content switching, and other network-related functions. This CPU is crucial for ensuring that network traffic is processed efficiently and in a timely manner.

In summary, the Management CPU is responsible for administrative tasks, while the Packet Engine CPU is dedicated to processing network traffic on a Citrix NetScaler appliance.