Summary: Discussion in the First Chapter

Note: Answers are grouped by question number. Each option is explained briefly along with examples. For terms already explained in earlier questions, see the short reference below.

1. Basic Hardware

Option	Term	Explanation	Example
a	Scanner	A hardware device that captures images or physical documents and converts them into digital data.	A flatbed scanner for scanning photos or documents.
b	Monitor	An output device that displays information visually to the user.	An LCD monitor on a computer.
c	Modem	Converts a computer’s digital signal into an analog signal that can be transmitted over a phone line or internet connection.	A broadband cable modem.
d	Flashdisk	A portable flash-memory-based storage device for saving and transferring data between computers.	A USB flash drive.

2. Additional Input & Output Devices

• a. Data Projector — An output device that projects text and images from a computer onto a larger screen. Example: a digital projector for presentations.
• b. Touch Pad — A touch-sensitive input device that replaces the function of a mouse on laptops. Example: a laptop touchpad.
• c. Scanner — See question 1.
• d. Bar Code Reader — A device for reading bar codes on products or labels. Example: a barcode scanner at a supermarket checkout.

3. Storage & Sound

• a. Tape — A magnetic storage medium for backing up data or archives. Example: a corporate backup tape.
• b. Modem — See question 1.
• c. Data Projector — See question 2.
• d. Sound Card — A piece of hardware that produces sound from a computer. Example: an onboard sound card on a motherboard.

4. The Acronym PDA

• a. Personal Digital Assistant (PDA) — A portable device for managing schedules, notes, and personal tasks. Example: the PalmPilot.
• b. Personal Data Assistant — (not the correct expansion)
• c. Person Digital Assistant — (not the correct expansion)
• d. Program Digital Assistant — (not the correct expansion)

5. Computer-Related Professions

• a. Programmer — An individual who writes computer code to develop software. Example: an application developer.
• b. Lawyer — A legal professional who provides legal services. Example: a corporate lawyer.
• c. Hacker — Someone with deep computing skills; can be used for either positive or negative purposes. Example: an ethical hacker hired to test system security.
• d. Cracker — An individual who uses their skills to break into computer systems or software with harmful intent. Example: a cracker who attempts to access private data without permission.

6. The Acronym CPU

• a. Central Processing Unit (CPU) — The main part of a computer that performs data processing. Example: an Intel Core i7 CPU.
• b. Communication Processing Unit — (not the correct expansion)
• c. Complication Processing Unit — (not the correct expansion)
• d. Central Production Unit — (not the correct expansion)

7. Internet & Security Terms

• a. E-mail — An electronic way to send messages over the internet. Example: sending an email to a friend.
• b. Hacking — The activity of looking for security holes in a computer system. Example: a hacker trying to gain access to a website.
• c. Cracking — The act of breaking software protections for unauthorized use. Example: cracking paid software so it can be used without a license.
• d. Netiquette — Etiquette for communicating online. Example: saying thank you in an email.

8. Large Storage Units

Option	Unit	Equivalent to	Example
a	Zeta Byte (ZB)	~1 trillion gigabytes	Estimated total capacity of the internet.
b	Mega Byte (MB)	~1 million bytes	The size of a small music file.
c	Giga Byte (GB)	~1 billion bytes	The capacity of a USB flash drive.
d	Tera Byte (TB)	~1 trillion bytes	The capacity of an external hard drive.

9. Basic Data Units

• a. Bit — The smallest unit in computing, with a value of either 0 or 1. Example: representing data in binary form.
• b. Byte — A group of eight bits used to store a character or piece of data. Example: the character 'A' is represented in one byte.
• c. Character — A symbol or letter in computer language. Example: 'A', 'B', 'C'.
• d. Kilo Byte (KB) — Equivalent to 1,000 bytes or 8,000 bits. Example: the size of a text document file.

10. Bit vs Byte

• a. Byte — See question 9.
• b. Kilo Byte (KB) — See question 9.
• c. Kilo Bit (Kb) — Equivalent to 1,000 bits. Example: internet data transfer speeds in kilobits per second.
• d. Bit — See question 9.

Conversion note: $1\ \text{byte} = 8\ \text{bit}$, so $1\ \text{KB} = 1000\ \text{byte} = 8000\ \text{bit}$.

11. Storage Block Sizes

Option	Size	Equivalent to	Example
a	256 Byte	256 characters / 2,048 bits	The capacity of a small memory block.
b	512 Byte	512 characters / 4,096 bits	The data block size in a file system.
c	1000 Byte	1 KB (decimal) / 8,000 bits	The KB count under the standard SI definition.
d	1024 Byte	1 KB (binary) / 8,192 bits	The KB count commonly used in computers.

12. Common File Extensions

• a. .mp3 — An audio file compressed with the MP3 format. Example: a .mp3 music track.
• b. .docx — A document created with Microsoft Word 2007 or later. Example: a .docx text document.
• c. .xls — A spreadsheet created with Microsoft Excel. Example: an .xls data table.
• d. .psd — An Adobe Photoshop project document. Example: a .psd image editing project file.

13. Software & Operating Systems

• a. Oracle — A database management system (DBMS) for managing and storing data. Example: a company using Oracle to store customer data.
• b. MySQL — An open-source database management system widely used in web development. Example: an e-commerce site that stores product data in MySQL.
• c. Java — A programming language often used for web-based software development. Example: a web application coded in Java.
• d. UNIX — A computer operating system often used on servers and in large computing environments. Example: a web server running on UNIX.

14. Other Languages & Software

• a. Perl — A high-level programming language often used for text processing and web development. Example: a Perl script for data analysis.
• b. MS-Office 2000 — A version of the productivity software suite released by Microsoft. Example: using Microsoft Word in Office 2000.
• c. Xenix — A Unix-variant operating system. Example: the use of Xenix in business environments.
• d. PHP — A programming language often used for web development. Example: developing dynamic websites with PHP.

15. URL Format Validity

• a. www.http://yahoo.com — Invalid format; www and http:// are written in the wrong order.
• b. http://mail~yahoo.com — Incorrect URL; the tilde character (~) is not part of a valid domain name.
• c. www.mail.yahoo.com — The URL for Yahoo’s email service. Example: accessing Yahoo email through the web address.
• d. http://id.yahoo.com — The URL for Yahoo Indonesia with the id subdomain.

16. Anatomy of a URL

Referring to an example URL such as http://www.republika.co.id:

• a. http:// — The protocol used to access the website.
• b. www — A subdomain commonly used to indicate a website.
• c. co.id — A domain segment indicating the type of organization as well as the country (Indonesia).
• d. republika — The specific domain name referring to the Republika site.

17. Domain Extensions

• a. .tv — Frequently used for websites related to video and entertainment.
• b. .idn — Not commonly recognized as a standard domain extension.
• c. .co — Frequently used for business and commercial websites.
• d. .to — The country-code domain extension for Tonga.

18. News Site URLs

• a. www.news.tv — A news site with the .tv domain, often focused on video content.
• b. www.news.com.sg — A news site with the .com.sg domain (associated with Singapore).
• c. www.news.com.my — A news site with the .com.my domain (associated with Malaysia).
• d. www.news.biz — A news site with the .biz domain, often used for business content.

19. Input Devices

• a. Scanner — See question 1.
• b. Monitor — See question 1. (Note: a monitor is actually an output device, not an input device.)
• c. Barcode Reader — A device for reading bar codes on products or labels. Example: a barcode scanner at a retail store.
• d. Touch Screen — A touch-sensitive screen that functions as an input device. Example: the touch screen on a smartphone.

20. Output Devices

• a. Data Projector — See question 2.
• b. Printer — An output device for printing documents or images from a computer. Example: an inkjet printer.
• c. Speaker — An output device for producing sound from a computer or audio device. Example: computer speakers.
• d. Bar Code Reader — See question 2. (Note: a barcode reader is actually an input device.)

21. Internal CPU Components

• a. Control Unit (CU) — The part of the CPU that coordinates a computer’s operations. Example: the control unit inside a processor.
• b. Buffer — A temporary storage area for holding data during transfer or processing. Example: a buffer in computer memory.
• c. Arithmetic and Logic Unit (ALU) — The part of the CPU that performs mathematical and logical operations. Example: the ALU in a processor.
• d. Register — A small, very fast component inside the CPU that stores data temporarily during computational operations.

22. ccTLD vs gTLD

ccTLD (Country Code Top-Level Domain) is a top-level domain reserved for a specific country or territory.

Examples of ccTLDs: .uk (United Kingdom), .de (Germany), .fr (France), .jp (Japan).

gTLD (Generic Top-Level Domain) is a top-level domain that is not tied to any specific country or territory.

Examples of gTLDs: .com (commercial sites), .org (non-profit organizations), .net.

Type	Purpose	Examples
ccTLD	Marks a country/territory	.fr, .jp, .id, .uk
gTLD	Generic, not tied to a country	.com, .org, .net