Abstract
This chapter describes the logical architecture of wireless networks with reference to the Open Systems Interconnect (OSI) model. The logical architecture of a wireless network is determined principally by standards that cover the Data Link and physical (PHY) layers of the OSI model. The Internet Protocol (IP) is responsible for addressing and routing each data packet within a session or connection set up under the control of transport layer protocols such as Transport Control Protocol (TCP) or User Datagram Protocol (UDP). The core of IP is the IP address, a 32-bit number that is attached to each data packet and is used by routing software in the network or on the Internet to establish the source and destination of each packet. While IP addresses, which are defined at the network layer, link the billions of devices connected to the Internet into a single virtual network, the actual transmission of data frames between devices relies on the media access control (MAC) addresses of the network interface cards (NICs).
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