Protocol Functions
Ordered Delivery
- PDUs may travel different routes, and may arrive out of order with respect to the transmitting order
- a protocol must be able to reorder the PDUs in the correct order
Flow Control
- a receiver may not be able to process the PDUs as fast as the transmitter can send them
- a receiver requires some way of limiting the rate of the transmitter
- flow control functions ensure that data sent does not overwhelm the receiver