The benefits of a layered model are as follows:
• It helps with the design of protocols, because each layer has a standard function and a standard interface for communication with other layers.
• It allows products from different vendors to work together, allowing for collaboration in design and competition between manufacturers of compatible components.
• It allows the technology of one layer to improve without affecting other layers.
• It provides common terminology to teach, learn, and discuss networks and network protocols.
Table 1-2 compares the OSI seven-layer model and the TCP/IP model.
Layer 2 of the OSI model, the data link layer, is made up of two ...