Transport layer .....
The transport layer provides flow control and sequencing.
physical layer
Data Link Layer
presentation layer
Layer 2 - The Data Link Layer Layer 2 of the OSI model provides error-detection capability
Network Layer This layer addresses the data. It adds an IP address which allows our data to flow across networks. The protocols involved in this layer are IP and IPX. Data Link Layer This layer provides the functional and procedural means to transfer data. It also corrects any errors that may occur in the Physical layer. The protocols used at this layer are media access control and logical link control.
Data Link
The application layer.
To reassemble the segments into data.
IP belongs to the Network layer of the OSI Model and provides information about how and where data should be delivered.
The median is the "middle" number in a set of data or a sequence. If you have the sequence 2,3,4,5,6 4 would be the median.
Trailer is added at only data link layer because data link layer provides error and flow control.Header Contains address of device where frames will be send