The Internet model consists of .......... layers.

The process-to-process delivery of the entire message is the responsibility of the ............ layer.

The ................ layer is the layer closest to the transmission medium.

Mail services are available to network users through the ................. layer.

As the data packet headers moves from upper layer to lower layers headers are ...........

The ................ layer lies between the network layer and the application layer.

Layer 2 lies between the physical layer and the ........... layer.

When data are transmitted from device A to device B, the header from A's layer 4 is read by B's _____ layer.

The ............. layer changes bits into electromagnetic signals.

Which of the following is an application layer service?