Special Edition Using TCP/IP, Second Edition

Summary

An internetwork is a group of networks that are connected to one another. The process of constructing and managing internetworks is called internetworking. The International Standards Organization (ISO) created a set of specifications called the Open Systems Interconnection (OSI) model for designing a network architecture that would enable data transfer across networks irrespective of the underlying hardware architecture. The OSI model comprises seven layers and each one of them plays a vital role in communication. The TCP/IP reference model, which is based on the OSI model, acts as a standard for communication on the Internet. The TCP/IP reference model is comprised of four layers.