$1$

In Point to Point Protocol, MAC Address of the receiver node is:

A$.$ Not required, since there is one transmitter and one receiver.

B$.$ Is required, since there is one transmitter and many receivers.

C$.$ Not required, since there is one transmitter and many receivers.

D$.$ Is reauired. since there is one transmiller and one receiver.

E$.$ None is true.

$2$

In Selective Repeat protocol, if the sequence number is $(8)$ and the window size is $(7).$ What possibly may happen?

A$.$ Packets being recognized incorrectly $($old packets will be considered as new packets$).$

B$.$ The receiver may send false Ack $($or NAK$).$

$$ C$.$ Overhead may occur.

D$.$ The scenario will be normal $($no problem will occur$).$

$$ E$.$ None is true.

$3$

In Selective Repeat protocol, if the sequence number is $(8)$ and the window size is $(7).$ What possibly may happen?

A$.$ Packets being recognized incorrectly $($old packets will be considered as new packets$).$

B$.$ The receiver may send false Ack $($or NAK$).$

C$.$ Overhead may occur.

D$.$ The scenario will be normal $($no problem will occur$).$

E$.$ None is true.

$4$

Select the right answers$).$

The interface between the application layer and transport layer known as:

$*$Socket$.$

$*$Gate$.$

$.$ Application Programming Interface.

$*$Thread$.$

$*$None is true.

$5$

For Ethernet, the best MAC Access protocol which has proven its efficiency is:

A$.$ CSMA$/$CD

B$.$ CSMA$/$CA

C$.$ CSMA

D$.$ Token Ring.

E$.$ Polling.