JUNE 2013 - Paper 3

16:   In a fully connected mesh network with n devices, there are ____________ physical channels to link all devices.
A.
n(n-1)/2 
B.
n(n+1)/2
C.

 2n

D.

2n+1

 
 

Option: A

Explanation :

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17:  

The baud rate of a signal is 600 baud/second. If each signal unit carries 6 bits, then the bit rate of a signal is 

A.

3600 

B.

100 

C.

6/600 

D.

None of the above

 
 

Option: A

Explanation :

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18:  

Match the following :
a. .Data link layer                                     i. Flow control
b. Network layer                                      ii. Node to node delivery 
c. Transport layer                                   iii. Mail  services
d. Application layer                                iv. Routing

Codes :
a  b  c  d

A.

ii    i     iv     iii

B.

ii      iv        i        iii  

C.

ii      i      iii      iv

D.

ii      iv       iii       i

 
 

Option: B

Explanation :

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19:  

An image is 1024*800 pixels with 3 bytes/pixel  Assume the image is uncompressed. How long does it take to transmit it over a 10 Mbps Ethernet ?

A.

196.6 seconds 

B.

19.66 seconds 

C.

1.966 seconds

D.

0.1966 seconds

 
 

Option: C

Explanation :

Size of the Image = 1024 x 800 x 3 bytes
		  = 2457600 bytes
	          = 19660800 bits
The time it takes to transfer the image over 10 Mbps Ethernet is 
10,000,000 bits = 1 second 
19660800 bits = 1.966 seconds

 

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20:  

The  _______________ measures the relative strengths of two signals or a signal at two different points. 

A.

frequency 

B.

attenuation

C.

 throughput

D.

decibel

 
 

Option: D

Explanation :

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