Computer Networks: Network Technology and Data Communications

LO1 (Part D) Quiz (Formative Assessment)

Test your knowlegde

Closed Book. Time allowed 45 minutes. Pass mark: 12 or greater out of 20

1. What type of encoding is illustrated by this graphic?

A) Manchester
B) AMI
C) NRZ
D) QAM

2. Which two digital line encoding methods are the most common?
A) Polar and Multipolar
B) Bipolar and Unipolar
C) Unipolar and Polar
D) Polar and Bipolar

3. How many levels of amplitude does Polar encoding use to represent bits?
A) 1
B) 2
C) 3
D) 4

4. Which of the following is regarded as using Polar Encoding?
A) AMI
B) B8ZS
C) NRZ
D) HDB3

5. What is the most common type of Biphase polar encoding used?
A) NRZ
B) Manchester
C) AMI
D) HDB3

6. Where is differential Manchester encoding commonly used?
A) Token passing networks
B) Mainframe communication
C) Ethernet LANs
D) ISDN links

7. What does it mean if the line is idle when using NRZ encoding?
A) 0
B) 1
C) 2
D) No transmission

8. What type of encoding is illustrated by this graphic?

A) AMI
B) Manchester
C) NRZ
D) B8ZS

9. What bit pattern is shown by this graphic?

A) 01100001
B) 10100100
C) 01010110
D) 01001110

10. What bit pattern is shown by this graphic?

A) 10010101
B) 01110100
C) 11010010
D) 01101101

11. How many voltage levels does bipolar encoding use?
A) 1
B) 2
C) 3
D) 4

12. What does the M stand for in AMI?
A) Mode
B) Map
C) Mark
D) Metre

13. What type of encoding is illustrated by this graphic?

A) AMI
B) Manchester
C) NRZ
D) 4B3T

14. What bit pattern is shown by this graphic?

A) 01010101
B) 11001010
C) 01001110
D) 01101011

15. Which of the following types of encoding uses a "Violation" bit?
A) HDB3
B) Manchester
C) AMI
D) NRZ

16. What does the T stand for in 4B3T?
A) Ternary
B) Tertiary
C) Token
D) Telephone

17. Which of the following types of encoding is a block code?
A) AMI
B) Manchester
C) NRZ
D) 4B3T

18. What layer of the OSI model does AMI encoding take place?
A) 1
B) 2
C) 6
D) 7

19. Manchester Encoding is a synchronous clock encoding technique used by the OSI model at the
A) Session Layer
B) Physical Layer
C) Network Layer
D) Transport Layer

20. Non-Return to Zero signalling encodes the bits to be transmitted using:
A) The changes in the signal
B) The phase of the signal
C) The delay in the signal
D) The amplitude of the signal