Traditional Network Concepts
Stuart Jacobs · 2011
This chapter focuses on the concepts and technologies currently found in major networks. It discusses the primary network architectures that are the ISO open systems interconnection (OSI) model and the Internet model. The OSI models seven layers are the application, presentation, session, transport, network, data link, and physical layers. They can be grouped in lower and upper layers. There are a number of physical and logical structures that modern networks rely on local area network (LAN), wireless LAN (WLAN), metropolitan area networks (MAN), wide area networks (WAN) and internet. The chapter also discusses the protocols used, along with both the mandatory and optionally available security capabilities of each protocol. It concludes by reviewing functionality and considering, by protocol layer, just what intrinsic security capabilities exist; starting with the physical layer and ending with the application layer. Controlled Vocabulary Terms metropolitan area networks; open systems; wide area networks; wireless LAN