Explain MODEM, Firewall, Router. List 2 examples each of optical and magnetic storage devices. Describe one use of OCR to a secretary.

Here are the explanations and applications:

i) Briefly explain the following terms:

a) MODEM
A MODEM (Modulator-Demodulator) is a device that converts digital signals from a computer into analog signals for transmission over communication lines (modulation) and converts incoming analog signals back into digital signals (demodulation). It enables internet connectivity.

b) Firewall
A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and untrusted external networks, like the internet.

c) Router
A router is a networking device that forwards data packets between computer networks. It directs traffic on the internet and within local networks, ensuring data reaches its intended destination efficiently.

ii)

a) Storage devices are either optical or magnetic. List two examples of each of optical and magnetic:

• Optical storage devices:
  1. CD (Compact Disc)
  2. DVD (Digital Versatile Disc)
• Magnetic storage devices:
  1. HDD (Hard Disk Drive)
  2. Magnetic Tape

b) Describe one use of OCR to a secretary.
A secretary can use OCR (Optical Character Recognition) software to convert scanned paper documents, such as letters or reports, into editable digital text files. This eliminates the need for manual retyping, saving significant time and effort.

c) Give ONE limitation of OCR.
One limitation of OCR is its accuracy can be low when dealing with poor quality documents, such as faded text, complex layouts, or handwritten notes, often requiring manual correction of errors.

iii) Explain ONE application of computers in each of the following domains:

a) Tourism
In tourism, computers are used for online booking systems, allowing travelers to search, compare, and book flights, hotels, and tour packages from anywhere in the world.

b) Banking
In banking, computers power Automated Teller Machines (ATMs), enabling customers to perform transactions like cash withdrawals, deposits, and balance inquiries 24/7 without human assistance.

c) Marketing
In marketing, computers are essential for digital advertising, allowing businesses to create, target, and deliver personalized advertisements to specific demographics across various online platforms and social media.