Which statement about the service label is FALSE?

The statement suggesting that a P device performs a service label swap operation is not accurate. In the context of MPLS (Multiprotocol Label Switching), P devices, or provider edge routers, are primarily responsible for forwarding labeled packets based on the MPLS label in the label stack. They do not perform the service label swap operation because that function is typically reserved for ingress and egress PE (Provider Edge) devices.

Ingress PE devices add service labels to the packets when they enter the MPLS network, effectively categorizing the packets according to the type of service they require. Conversely, egress PE devices are tasked with removing these service labels before the packets are sent to their final destination, which allows the receiving device to process the packets without MPLS labels.

Thus, the other options accurately reflect the functions and responsibilities of the network devices involved with service labels in an MPLS environment.