CS601  MIDTERM  MCQS  MOAAZ  AND  WAQAR 


1. Error correction is more ___ than the error detection.

a) Easy

b) Useless

c) Informal

d) Difficult

 

2. ___ is responsible for governing node to node communication.

a) Application layer

b) Session layer

c) Data link layer

d) Presentation layer

 

3. The extra bits added with the original data for error detection/correction

are called ___.

a) Fault bits

b) Port numbers

c) Redundant bits

d) Process IDs

 

4. The ___ is the number of signal elements sent per unit time.

a) Data rate

b) Signal rate

c) Bit rate

d) Period

 

5. The ___ protocols uses both flow and error control.

a) TCP/IP

b) HDLC

c) ICMP

d) Stop-and-wait

 

6. ___ is an Authentication Protocol, which uses two-step process to

authenticate user information.

a) CHAP

b) LCP

c) PAP

d) ICMP

 

7. In Block coding we divide our message into blocks of k bits called as

____.

a) Code words

b) Data words

c) Passwords

d) Cross words

8. To control and manage the transfer of data, a protocol called Point to

Point Protocol (PPP) is used at the ____ layer.

a) Physical

b) Network

c) Presentation

d) Data link

 

9. ___ is an authentication protocol, which is used by the PPP to

authenticate passwords.

a) CHAP

b) PAP

c) LCP

d) ICMP

 

10. No matter whether the link is dedicated or broadcast, data link control

(DLC) layer provides services between ___.

a) Virtual LANs

b) Tow adjacent nodes

c) Ethernet links

d) Source and destination PCs

 

11. S-frames in High-Level Data Link Control (HDLC) are only used to

transfer ___ information.

a) User data

b) Control

c) Redundant

d) Original

 

12. Congestion Control is a feature of ___ layer (s).

a) Data Link

b) Network

c) Transport

d) All mentioned

 

13. ___ is used in the stop-and-wait protocol to overcome the issue of

duplication.

a) Frame sequencing

b) Acknowledgement numbering

c) Counter and Timer reset

d) Frame sequencing and Acknowledgement numbering

 

14. DLC in Data Link Layer stands for ___.

a) Divide Line Communication

b) Data Line Code

c) Data Link Control

d) Demand Link Coordination

 

15. In even parity check code, the value of syndrome is ___ If the number

of 1s is even.

a) 1

b) 2

c) 0

d) 4

 

16. If the hamming distance between sent and received code word is ___

then it shows that received data is corrupted.

a) ≠ 0

b) = 0

c) ≠ 1

d) = 1

 

17. ___ is not a function of Data Link Control.

a) Framing

b) Modulation

c) Error Control

d) Flow Control

 

18. Checksum is an error-detection technique that can be required to a

message of ___ length.

a) Exactly 4

b) Exactly 8

c) Exactly 32

d) Any

 

19. ___ category of coaxial cable is used for cable TV.

a) RG-58

b) RG-59

c) RG-11

d) RG-47

 

20. In circuit switched networks we have low efficiency but minimal ___.

a) Delay

b) Speed

c) Throughput

d) Errors

 

20. In circuit switched networks we have low efficiency but minimal ___.

a) Delay

b) Speed

c) Throughput

d) Errors

 

21. In ___ systems. Resources are allocated on demand.

a) Frequency switching

b) Line switching

c) Circuit switching

d) Packet switching