Physical Layer, SONET is the other name used for it
Data link layer
FTP (File Transfer Protocol) is an application layer, or Layer 7, protocol.
Network Layer
TCP, the Transmission Control Protocol, is a layer-4 protocol (in the 7-layer OSI model).
in the osi model data link layer is adds source & destination mac address to frames
because osi is open system interconnection that used to interact with open system
The Open Systems Interconnect or OSI model has seven layers. The layer that is responsible for creating frames is the Data Link layer.
The physical layer of the OSI model is responsible for encoding frames in to the electronic/RF/optical signals of the physical medium and for reading the media and translating back in to usable frames.
ports protocol
Data link layer
International Standards Organization(ISO)
Ethernet is a data link layer protocol - layer 2
FTP (File Transfer Protocol) is an application layer, or Layer 7, protocol.
Network Layer
TCP, the Transmission Control Protocol, is a layer-4 protocol (in the 7-layer OSI model).
Anything that is described in the OSI model is a standardized protocol, including any new ones such as IPv6.
UDP or User Datagram Protocol works on the Transport Layer (layer 4) in the OSI model.