Labels:text | screenshot | colorfulness OCR: Application Named RPC APPC Presentation Pipes XDR Session NetBIOS Sockets LU 6.2 Transport SPX TCP Network IPX IP PU 2.1 Data Link IEEE 802.5/8023 SDLC Physical Cabling Plant Figure 3. Major Protocols within the OSI model, As with Figures 1 and 2, a layer communicates only with the adjacent layers pictured above and below it (not with the layers pictured to the right or left).