lowest layer concerned with end-to-end delivery
network
layers that know about routing
only network
layers that do not know about end-to-end delivery
below network
layers that do not know about the topology of the network
above network
Where are transport layer and up used?
only at endpoints
Where are link and network layer headers inspected and updated?
throughout network
layers responsible for congestion control
network and transport
layer that control the workload and how
transport
implements congestion control and flow control by reducing sending rate