Question

b. explain three reasons for choosing this computer over others mentioned in question 1a. (2 marks for each point making 6marks) explain the main difference between virtual reality and augmented reality.
question 2
a. research what is meant by blockchain technology and how it could revolutionize data security and privacy in future smart - devices. (2 marks)
b. describe how the internet works, based on the following:
i. data transmission
ii. networking hardware
iii. connection types
iv. ip addresses and dns
(2 marks each)
question 3
explain how data is transmitted over the internet using tcp/ip protocols. (5 marks)
explain why without an isp we would be unable to connect to the internet. (3 marks)
note!!!

Explanation:

Step1: Define blockchain technology

Blockchain is a decentralized, distributed ledger technology that records transactions across multiple computers in a secure, transparent, and immutable way. It consists of blocks of data that are linked together in a chain, with each block containing a cryptographic hash of the previous block.

Step2: Discuss its potential for revolutionizing data security and privacy

In future smart - devices, blockchain can enhance security as it is highly resistant to tampering due to its distributed nature. Each node in the network has a copy of the ledger, making it difficult for a single entity to manipulate data. For privacy, it can enable more control over personal data. Users can have more say in who accesses their data, as transactions are encrypted and can be made more private through techniques like zero - knowledge proofs.

Step3: Describe data transmission in networking hardware

i. Data Transmission: In networking hardware, data is broken into packets at the source. These packets are then sent over the network through various intermediate devices like routers. Each packet contains source and destination IP addresses, along with the actual data payload.
ii. Network Hardware: Network hardware includes devices such as routers, switches, and network interface cards (NICs). Routers are responsible for forwarding packets between different networks, switches connect devices within a local network, and NICs are used to connect devices to the network.
iii. IP Addresses and DNS: IP addresses are unique identifiers assigned to devices on a network. They are used to route packets to the correct destination. DNS (Domain Name System) is like a phone - book for the internet. It translates human - readable domain names (e.g., example.com) into IP addresses so that devices can communicate with the correct servers.

Step4: Explain data transmission using TCP/IP

TCP/IP (Transmission Control Protocol/Internet Protocol) is a suite of protocols used for communication over the internet. TCP is responsible for ensuring reliable data transfer. It breaks data into segments, numbers them, and ensures that all segments are received correctly at the destination by using acknowledgments and re - transmissions if necessary. IP is responsible for addressing and routing the packets across different networks.

Step5: Explain the importance of IP

An IP address is essential for connecting to the internet. Without an IP address, a device has no unique identifier on the network. The internet is a vast network of interconnected devices, and IP addresses are used to route data packets to the correct destination. Just like a letter needs a destination address to be delivered, a device on the internet needs an IP address to send and receive data.

Answer:

1. Blockchain is a decentralized, distributed ledger for secure and private data handling in smart - devices.
2. i. Data is packetized for transmission. ii. Routers, switches, and NICs are key network hardware. iii. IP addresses identify devices and DNS translates domain names to IPs.
3. TCP ensures reliable data transfer and IP for addressing/routing. Without IP, no unique device identification for internet connection.