Frames and packets Recap Messages at the data link layer are called frames Messages at the internet layer are called packets Within a single network, packets are encapsulated in the data fields of frames Frame Packet Frame Trailer (Data Field) Header 8-58-5 Frames and Packets • Messages at the data link layer are called frames • Messages at the internet layer are called packets • Within a single network, packets are encapsulated in the data fields of frames Frame Header Packet (Data Field) Frame Trailer Recap