claim: Internet access started in the United States of America.
evidence: The data link layer or layer 2 is the second layer of the seven-layer OSI model of computer networking .. OSI model. OSI model. link layer. link layer. This layer is the protocol layer that transfers data between adjacent network nodes in a wide area network -LRB- WAN -RRB- or between nodes on the same local area network -LRB- LAN -RRB- segment .. wide area network. wide area network. local area network. local area network. segment. network segment. The data link layer provides the functional and procedural means to transfer data between network entities and might provide the means to detect and possibly correct errors that may occur in the physical layer .. transfer. transfer ( computing ). physical layer. physical layer. link layer. link layer. The data link layer is concerned with local delivery of frames between devices on the same LAN .. frames. Frame ( networking ). link layer. link layer. Data-link frames , as these protocol data units are called , do not cross the boundaries of a local network .. frames. Frame ( networking ). protocol data units. protocol data units. Inter-network routing and global addressing are higher-layer functions , allowing data-link protocols to focus on local delivery , addressing , and media arbitration .. This way , the data link layer is analogous to a neighborhood traffic cop ; it endeavors to arbitrate between parties contending for access to a medium , without concern for their ultimate destination .. link layer. link layer. When devices attempt to use a medium simultaneously , frame collisions occur .. Data-link protocols specify how devices detect and recover from such collisions , and may provide mechanisms to reduce or prevent them .. Examples of data link protocols are Ethernet for local area networks -LRB- multi-node -RRB- , the Point-to-Point Protocol -LRB- PPP -RRB- , HDLC and ADCCP for point-to-point -LRB- dual-node -RRB- connections .. Ethernet. Ethernet. Point-to-Point Protocol. Point-to-Point Protocol. HDLC. HDLC. ADCCP. ADCCP. In the Internet Protocol Suite -LRB- TCP / IP -RRB- , the data link layer functionality is contained within the link layer , the lowest layer of the descriptive model .. Internet Protocol Suite. Internet Protocol Suite. link layer. link layer