CS601 Midterm Solved Paper by Sadia Ali

MIDTERM EXAMINATION Spring 2010

CS601- Data Communication Time: 60 min Marks: 40

Q1. The information to be communicated in a data communications system is the (1 marks)

• Medium
• Protocol
• Message

p_5

• Transmission

Q2. Which is not an element of protocol (1 marks)

• semantics
• timing
• communication service module

p_17-18

Q3. Line configuration refers to the way two or more devices attach to a ______. (1 marks)

• Link

p_24

• Circuit
• Route
• Node

Q4. _________requires the maximum number of I/O ports. (1 marks)

• Bus
• Star
• Mesh

p_28-29

• Ring

Q5. Which topology requires a central controller or hub? (1 marks)

• Mesh
• Star

p_29

• Bus
• Ring

Q6. Layers 5, 6 and 7 also called as network support layers. (1 marks)

• True
• False

p_42

Q7. Internet with small “i” specifies the world wide Network the actual internet. (1 marks)

• True
• False

p_39

Q8. Data link layer deals with mechanical and electrical specifications of transmission medium and interface (1 marks)

• True
• False

p_44

Q9. Data synchronization is a function related with ___________ (1 marks)

• session layer

p_52

• presentation layer
• transport

Q10. OSI model was developed prior to TCP/IP model. (1 marks)

• True
• False

p_56

Q11. Fourier transform tells us that any digital signal can be decomposed into infinite number of periodic signals (1 marks)

• True

p_61

• False

Q12. A signal that repeats a pattern over a regular interval of time is called_______. (1 marks)

• periodic signal

p_60

• analog signal
• composite signal

Q13. Frequency band in which 99% of the total power resides is called_______ (1 marks)

• power bandwidth

p_70

• half power bandwidth
• 3dB bandwidth
• F.M.

Q14. In differential Manchester we require two transition or signal changes to represent binary_____ (1 marks)

• zero

p_78

• one
• both zero and one

Q15. In Alternate mark inversion the term mark comes from_________ (1 marks)

• telegraphy

p_79

• telephony
• digital telephony

Q16. A 56k modem can download at a rate of __________ Kbps and upload at a rate of __________ Kbps. (1 marks)

• 33.6: 33.6
• 33.6: 56.6

p_122

• 56.6: 33.6
• 56.6: 56.6

Q17. The bit rate always equals the baud rate in which type of signal? (1 marks)

• FSK

p_92

• QAM
• 4-PSK
• PSK

Q18. Asynchronous transmission is ___________ (1 marks)

• slow

p_103

• costly
• non-effective
• fast

Q19. At the ______________layer, a DCE takes data generated by a DTE. (1 marks)

• physical

p_106

• transport
• data link
• application