I'm confused with some concepts please help me out,
- Data link layer manage flow control hop to hop. Flow control requires acknowledgement receiving but If we observe data link layer header, it does not have any ack field.
So does that mean data link layer always depend on transport layer for acknowledgement processing?
- On receiving a packet from any local nodes does router gives acknowledgement in return? If they do then how it is possible as they operate only up to network layer and ack generate in transport layer?