This figure shows a network setup with a client, connected to a C E device, which is connected to a P E device. The P E device is connected to the internet and to web-based application servers, using port 80.

One classification is applied at the C E device to mark requests to web-based applications and another classification marks internet requests from the client.

At the P E device, one classification marks incoming internet traffic and another classification marks incoming traffic from web-based applications.