CertiGuide to A+ (A+ 4 Real)  9  Chapter 13: Basic Networking Terminology       9  OSI Reference Model and Networking Protocols and Technologies            9  Layer 3 - Network Layer

Layer 3 - Network Layer 1 Class A

The Internet Protocol (IP) is the most popular implementation of a hierarchical network-addressing scheme. IP is the network protocol the Internet uses. As information flows down the layers of the OSI model, the data is encapsulated at each layer within packets. The IP determines the form of the IP packet header (which includes addressing and other control information), but does not concern itself with the actual data. It accepts whatever is passed down from the higher layers

There are three classes of IP addresses (Class A, B, and C) that an organization can receive from the American Registry for Internet Numbers (ARIN) or from the organization's ISP)

Layer 3 - Network Layer 1 Class A