GRADE12-COMMUNICATION AND INTERNET TECH

Introduction

  • Subject Matter: OSI Model, Protocols, Circuit Switching, and Packet Switching

  • Authors: Mr. Christian Ngolo, Mr. Irfan Hamid, Mr. C. C. Maurice

Objectives

  • Understand foundational elements of modern communication networks.

  • Importance of communication in the digital age.

  • Evolution from analog to digital signals.

Communication Protocols

  • Definition: Rules for transmitting data between devices.

  • Types:

    • TCP/IP: Backbone of the internet, with TCP for reliable data transmission and IP for addressing and routing.

    • HTTP/HTTPS: Web content protocols ensuring secure communication.

    • Email Protocols: SMTP, POP, IMAP for sending, receiving, and managing email.

  • Function: Ensure data integrity, security, and efficiency.

OSI Model Overview

  • Definition: Conceptual framework for network functions.

  • Layers:

    1. Physical: Data transmission over hardware.

    2. Data Link: Reliable data transfer between nodes.

    3. Network: Routing and forwarding data packets.

    4. Transport: End-to-end communication and error control.

    5. Session: Manages sessions between applications.

    6. Presentation: Translates data for application understanding.

    7. Application: User interface with network services.

TCP/IP Model Overview

  • Link Layer: Physical data transmission, manages node communication.

  • Internet Layer: Routing of packets across networks using IP.

  • Transport Layer: End-to-end communication; TCP provides reliability, UDP offers connectionless service.

  • Application Layer: Interfaces with user applications (file transfer, email, web access).

Common Protocols Used

  • Ethernet: Protocol for local area networks (LANs).

    • Features: CSMA/CD for data transmission, supports various speeds, both wired and fiber-optic.

  • Wireless Protocols: Standards for wireless communication (e.g., Wi-Fi, Bluetooth).

    • Security protocols like WPA2/WPA3 for Wi-Fi, mobile communications capabilities.

  • Bluetooth: Short-range wireless technology for data exchange.

    • Low power consumption, operates in 2.4 GHz frequency.

  • WiMAX: Wireless broadband over long distances.

  • P2P File Sharing: Efficient file distribution method (BitTorrent protocol).

Circuit Switching

  • Concept: Dedicated physical path for communication session.

  • Characteristics: Reserved channel, examples in traditional PSTN.

  • Advantages: Guaranteed bandwidth, low latency.

  • Disadvantages: Inefficient bandwidth use.

Packet Switching

  • Concept: Data is sent in packets that travel independently.

  • Characteristics: Shared network resources, examples: modern data networks.

  • Advantages: Efficient resource use, scalability.

  • Disadvantages: Variable latency, complex routing.

Comparison: Circuit vs. Packet Switching

Feature

Circuit Switching

Packet Switching

Resource Use

Inefficient

Efficient

Latency

Low

Variable

Bandwidth

Fixed

Dynamic

Scalability

Limited

High

Cost

Higher for setup

Lower, scalable

Applications and Future Trends

  • Applications:

    • Circuit Switching: Legacy systems, telephony.

    • Packet Switching: Internet, mobile networks, IoT.

  • Future Trends: Integration of AI in network management, evolution towards integrated services via 5G.

Conclusion

  • Thank you!