OSI reference model: the physical layer, data link layer, network layer, transport layer, session layer, presentation layer, application layer.
The data link layer : MAC address that is responsible for allocating a physical address by 48 bits long, 12-digit hexadecimal number.
Network layer : responsible for routing the data packet and store and forward, the agreement includes: IP, IPX, ICMP, IGMP , ARP, RARP, OSPF.
Transport Layer : the first end, which is the process to the level of the process. Since a host can run multiple processes simultaneously, the transmission layer demultiplexing and multiplexing functions. With a transport layer protocol: TCP, UDP, SCTP. Unit transport layer data packets or data segments.
Application Layer : provides access to network services for the operating system or network application programming interfaces, protocols are: RIP, TELNET, FTP, HTTP , SNMP.
