Once the packet has been identified, you can modify the bits to have it do its next thing. Some people call them actions. The fourth and fifth functions are often used together. One is compression of the data in the packet and the other is encryption. Encryption tries to keep the data secure so it can only be looked at by the intended receiver and no one else.
Compression shrinks the packet back down.
The last function is called traffic shaping, also known as traffic engineering. It replicates the flow of packets in and out of network nodes, and every application chooses a mix of these functions. For example, once you've classified and verified the packet, the action is either to let the packet pass the firewall or not. There is no compression, no encryption and no traffic shaping. Sometimes the packet is so trivial that if you do the classification you don't need to do anything else.