June 2018

Question 1

12 mark question And three other points
Explaining how the performance of a system could be improved and making sure to refer to factors affecting the processor performance.

Answer 1

Server hardware
1. More cores (expand)
2. More cache memory(expand)
3. Faster clock(expand)
Design of computer network.
1.replace any wireless WiFi with wired connections.
2.More effieccient protocal
3.use star topology.
Database and software

Question 2

Describe the principles of operation of an optical disk drive that is USED TO READ data from an optical disk such as CD-rom and DVD- rom.

Answer 2

Reading mechanism

Laser light shone at disk
Light focused on a spot
Some light is reflected back from the disk
Light lens or detects the reflection
Disc spins at a constant linear velocity

How data is represented
Data is read on a spiral
Continuation of land/pit reflects light whereas transition between land and pit scatters light.

Question 3

2 reasons why data is normalised in a database

Answer 3

1. Eliminate redundant data
2. Reduce/ remove update anomalies