Inside Your Personal Computer Final Exam

Some of the exam questions that have been puzzling me:

1. What is sampling rate and sampling precision equal to in a JPEG image file?

Is it sampling rate = resolution or frames per second
sampling precision = bits per pixel or colours per pixel

2. Twisted Pair wires have 2,4,6, or 8 wires. Which is false?

Is it 2?

Some of the other questions that came out in the exam:

1. War Drivers

- What are War Drivers?
- What problems can they cause?
- How can we prevent ourselves from being made use of by War Drivers?

Kinda expected this question because it was not asked in the quiz question and it is included in the Sound Bytes.

2. Distributed Denial of Service Attacks

- What are DDOS attacks?
- What else does a hacker do to conduct DDOS attack?
- Why is it difficult to recover from a DDOS attack? How can an ISP help?

Did not do well for the last part of the question cos I misinterpretated what the question was asking.

3. Analog to Digital Graph conversion

- Write the binary digits corresponding to the values in the graph
- Plot the Analog graph on the graph
- Calculate the percentage increase in the number of bits used

Did not do well for this question because I was not able to calculate the bits correctly as well as the percentage increase.

Number of values for 0-3: 4 = 2 ^2
Number of values for 0-15: 16 = 2 ^4

Percentage increase = 4/2 X 100 = 200%

4. Why can't hard drive work very well at high altitides?

I wrote that because of the lesser amounts of airflow that is at higher altititues and hard drive require air to cushion the read/write head above the platters during spinning to prevent it damaging the magnetic surface area of the platters by scratching it

5. JPEG and Bitmap: which utilise compression and which don't?

6. Why is the minimum file size on a hard drive 4096 bytes?

The minimum file size on a hard drive is 4 KB which is 4 X 1024 bytes due to Windows XP and NTFS.

7. When a computer sends data to computer Y through a wireless access point, and there are also computer X and Z in the vicinity, which computer will get the data?

Only Computer Y will receive the data.

Total of 90 questions inclusive of True/False questions, MCQs, fill in the blank answers and short answer questions.