Data Comms Reviewer for UT2

The ______ is the physical path over which a message travels.

• a. Protocol

• b. Medium

• c. Signal

• d. All of the above

The information to be communicated in a data communications system is the ______.

• a, Medium

• b. Protocol

• c. Message

• d. Transmission

Frequency of failure and network recovery time after a failure are measures of the _______ of a network.

• a. Performance

• b. Reliability

• c. Security

• d. Feasibility

Unipolar, bipolar, and polar encoding are types of encoding.

• a. Line

• b. Block

• c. NRZ

• d. Manchester

______ encoding has a transition at the middle of each bit.

• a. RZ

• b. Manchester

• c. Differential Manchester

• d. All of the above

PCM is an example of ______ conversion.

• a. Digital-to-digital

• b. Digital-to-analog

• c. Analog-to-analog

• d. Analog-to-digital

______ encoding has a transition at the beginning of each 0 bit.

• a. RZ

• b. Manchester

• c. Differential Manchester

• d. All of the above

Which of the following methods does not provide for synchronization?

• a. NRZ-L

• b. RZ

• c. NRZ-I

• d. Manchester

Which encoding method uses alternative positive and negative values for 1s?

• a. NRZ-I

• b. RZ

• c. Manchester

• d. AMI

Block coding can help in ______ at the receiver.

• a. Synchronization

• b. Error detection

• c. Attenuation

• d. (a) and (b)