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CBSE AISSCE 2017-2018 Marking Scheme for Computer Science
(2018-2019 Sub Code: 083 Paper Code: 91)

(d) Reduce the following Boolean Expression to its simplest form using K-Map: 3
G(U,V,W,Z) = ​∑​(3,5,6,7,11,12,13,15)

OR

F(U,V,W,Z)= VZ + WZ + UVW’+ U’VW

(½ Mark for drawing K-Map and correctly plotting 1s in the given cells)
( ½ Mark each for 4 groupings)

( ½ Mark for writing final expression in reduced/minimal form)
Note:
● Deduct ½ mark if wrong variable names are used
7 (a) Differentiate between Bus Topology and Star Topology of Networks. What are the 2
advantages and disadvantages of Star Topology over Bus Topology?

Ans
Bus Topology Star Topology
It is characterised by common It is characterised by central
transmission medium shared by all the switching node connected directly
connected nodes. to each of multiple nodes in the
network.

OR
Bus Topology Star Topology

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