A packet usually contains information about its origin and its destination
e bit rate of the physical layer is always expressed in bits per second
The unit of information exchanged between two entities in the Datalink layer is a frame. A frame is a finite sequence of bits. Some Datalink layers use variable-length frames while others only use fixed-length frames.
Two communicating devices are linked through a physical medium.
This is the task of the network layer. The network layer is built above the Datalink layer. Network layer entities exchange packets.
Transport layer entities exchange segments. A segment is a finite sequence of bytes that are transported inside one or more packets
We will use Application Data Unit (ADU)
The most widely used transport layers on the Internet are TCP ,that provides a reliable connection-oriented bytestream transport service, and UDP
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