Chapter II Understanding Functions and operations of various of Information Communication Technology devices

A. Multiple Choice

1. a
2. c
3. b
4. b
5. e
6. e
7. c
8. b
9. a
10. c

 B. Essay

  1. In ASCII code, by what code is letter W represented?

• The letter W is represented by the number code 87.       

  2. Name and explain all supporting deviced inside a CPU?

• Control unit is to translate commands or instructions in a series and then continues them to the entire computer parts. 
• Arithmetic Logic Unit (ALU) is to process data by adding, substracting, comparing and using logical formulas. 
• Memory is to collect or to store data to run an application program. 

   3. What is the abbreviation and the function of ROM?

• ROM is a permanent memory that can be read but cannot be updated. ROM is to save computer operation program, such as BIOS and booting.  

  4. Name three examples of network interface cards?

• Ethernet
• Arcnet
• Token Ring

  5. Name and explain several cables that use on a wired network?

• UTP Cable (Unshielded Twisted Pair) it consists of a pair of plastic wrapped conductor and each is colored. The frequency ranges from 100 Hz to 5 MHz. A UTP connector is required to install a UTP cable on network card, such as RJ 45 connector. The cost of UTP is relatively cheap.
• STP Cable (Shielded Twisted Pair) is a similar with UTP cable, except that is has double wrap. The middle wrap is metal shield or metal foil to avoid electromagnetic interference. 
• Coaxial Cable consists of a main copper conductor with three wrap. The first and third are plastic wraps. 
• Optical Fiber is made of plastic or glass that acts as a medium for signal transmission in the form of light.