COMPUTER NETWORK MCQS

1) If N is the maximum sequence number,then the window sizes in selective reject and Go- Back -N protocols are respectively- 
 A. N/2,N-1
 B. N,N+1
 C. N+1/2,N
 D. N-1,N+1
Ans:-  A

2) The store and forward mechanism is used in 
 A. Packet switching
 B. Message switching 
 C. Circuit switching 
 D. Data gram switching 
Ans:-B

3) The idea of RZ and the idea of NRZ-L are combined into the .....scheme. 
 A. Manchester
 B. Differential manchester
 C. Both (a) and (b)
 D. Neither (a) and (b)
Ans:-A

4) ASK,PSK,FSK and QAM are examples of....... 
 A. Digital to digital
 B. Digital to analog
 C. Analog to analog
 D. Analog to digital
Ans:-B

5) To prevent signal alternation ,what is the maximum number of repeaters that can be placed on one 10 Base 5 or 10 Base 2 network? 
 A. Four
 B. Five
 C. Three
 D. Any number
Ans:-A

6) How many carrier frequencies are used in BASK? 
 A. 2
 B. 1
 C. 0
 D. None of above
Ans:-B

7) The systems that can be used in both priority and non priority modes is 
 A. TDM
 B. Register insertion
 C. Carrier sense system
 D. All of these
Ans:-C

8) In TCP ,a unique sequence number assigned to each 
 A. Byte
 B. Word
 C. Segment
 D. Message
Ans:-A

9) The constellation diagram of QPSK has.......dots 
 A. 2
 B. 4
 C. 0
 D. None of above
Ans:- B

10) The value of N(S) is related to the value of P(S) as 
 A. N(S)-P(S)=number of outstanding packets
 B. N(S)-P(S)=number of outstanding frames
 C. N(S)-P(S)=number of active logical channels in the link
 D. They are not related
Ans:-D

11) Which is reserved address for private networks? 
 A. 10.0.0.0 to 10.255.255.255
 B. 128.0.0.0 to 191.255.255.255
 C. 150.0.0.0 to 150.255.255.255
 D. 202.40.55.0 to 202.40.55.255
Ans:-A