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d) Write the equivalent Boolean expression for the following logic circuit. 2

X Y

F

Ans: (X+Y’)(X’Y)(X’+Y’)

7. a) Write two advantages of using an optical fibre cable over an Ethernet cable

to connect two service stations which are 200mt away from each other. 1
Ans: It is faster communication

Low attenuation
No EMI interface
It has much more greater bandwidth than metal cables

b) Which type of network (out of LAN, MAN, WAN, PAN) is formed when you
connect two mobiles using Bluetooth to transfer a video. 1

Ans: PAN
c) What is the difference between HTTP and FTP? 2

Ans: HTTP( Hyper Text Transfer Protocol) used by web browser to allow web pages to be
shown in a web browser.
FTP( File transfer Protocol) transferring a file from one computer to another. Commonly used

for uploading a web page to a web server.
d) Write one advantage of each for Open Source Software and Proprietary

software. 1
Ans: Open source software in which the source code is available to the general public for use
and/or modification from its original design free of charge.
Proprietary s/w refers to any computer s/w that has restrictions on any combination of the
usage, modification, copying or distributing modified version of the s/w.

e) Write one advantage of BUS topology of network. Also, illustrate how 4
computers can be connected with each other using star topology of network. 1

Ans: Cable length required for this topology is the least compared to other networks.
Illustration of 4 computers connected with each other using star topology of network.

XII / Comp. Sc. Page 15 of 17