21)Which of the following are part of a data communication system?
a) Sender, receiver
b) Transmission medium
c) Message, protocol
d) All
22)The hardware interface between a computer and network is known as ……………..
a) NIC
b) router
c) mesh
d) protocol
23)Which of the following TCP/IP layer contain IP and ARP protocol?
a) Application layer
b) Transport layer
c) Internet layer
d) Network access layer
24) Which of the following layers is a part of the TCP/IP internetworking model?
a) Internet Layer
b) Transport layer
c) Application Layer
d) Network access layer
d) All