Refer to Figure 6-1 on page 109 and Figure 6-2 on page 110. The task of creating a message to be sent, dividing it into packets and delivering them to their ultimate destination is performed by the following layers:
Upper Layer Protocols (ULPs).
Verbs Layer.
Transport Layer (i.e., QPs and EECs).
Network Layer.
Link Layer.
Physical Layer.
The following sections provide an introduction to the layers.