CS revision chapter 2,3 & 4

Which is true about data packet?

• message or data is sent in a big packet with plug in USB

• a small part of a message or data that is transmitted over a network

• after transmission all the data packets are reassembled to form the original message or data

• all of the above

an error checking method in which all the 1-bits in the data packet payload are added and the total is stored in the packet trailer; the same calculation is repeated at the receiving station. What is this statement refer to?

• cyclic redundancy check (CRC)

• data packet

• router

• simplex

What is packet switching?

• a method of transferring data via USB

• a method of network wiring

• a method of transmission in which a message is broken into many data packets which can then be sent along pathway independently of each other

• all of the above

Data packet contain a header. Which are the below components find in header?

• IP address of the source device (sender)

• IP address of the destination device (receiver)

• sequence number of the packet (allowing correct reassembly)

• all of the above

When data can be sent in ONE DIRECTION ONLY, what mode is this called?

• transmission mode

• full-duplex

• half-duplex

• simplex

When data is sent in BOTH DIRECTIONS but NOT AT THE SAME TIME. What mode is this called?

• transmission mode

• full-duplex

• half-duplex

• simplex

When data can be sent in BOTH DIRECTIONS AT THE SAME TIME. What mode is this called?

• transmission mode

• full-duplex

• half-duplex

• simplex

A walkie-talkie where a message can be sent in one direction only at a time; but message can be both received and sent. What kind of data transmission mode is this?

• transmission

• full-duplex

• half-duplex

• simplex

When sending data from a computer to a printer, what kind of data transmission is this?

• transmission

• full-duplex

• half-duplex

• simplex

A broadband internet connection is a type of data transmission, what type is this?

• transmission

• full-duplex

• half-duplex

• simplex