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Mastering the Concepts of OSI Model
Rating: 4.3 out of 5(120 ratings)
5,005 students

Mastering the Concepts of OSI Model

Everything about the 7 Layers of OSI Model
Created byDhananjay Naldurgkar | Cybersecurity Expert
Last updated 12/2024
English
English [Auto],

What you'll learn

  • Understand the OSI (Open Systems Interconnection) model as a conceptual framework for understanding network communication.
  • Learn the seven layers of the OSI model, including Physical, Data Link, Network, Transport, Session, Presentation, and Application layers.
  • Gain in-depth knowledge of the functions, protocols, and technologies associated with each OSI layer.
  • Explore practical applications of the OSI model in real-world networking scenarios.
  • Master troubleshooting techniques using OSI layer concepts to diagnose and resolve network issues.
  • Gain hands-on experience through lab exercises, simulations, and case studies to reinforce theoretical knowledge.
  • Develop critical thinking skills to analyze network architectures and design solutions using OSI layer principles.
  • Learn about the OSI model's relationship with the TCP/IP model and other networking standards.
  • Understand the advantages and limitations of the OSI model in modern network design and implementation.
  • Prepare for industry certifications, such as CompTIA Network+, Cisco CCNA, or other networking certifications that require a strong understanding of the OSI mod

Course content

2 sections • 18 lectures • 3h 2m total length

  • Course Orientation - OSI Model5:38

    Explore the OSI model and its layered cake-like structure that enables internet communication, and embrace a practical, finish-line mindset to master data transfer and device communication.

  • Introduction to OSI and TCP IP Model7:32

    Explore how the OSI model provides a structured framework for network communications and how TCP/IP became the de facto standard, with seven layers guiding modern protocols.

  • Understanding Application Layer23:08

    Identify how the application layer provides networking services to user applications by attaching port numbers and enabling protocols like HTTP, FTP, SMTP, and DNS.

  • Application Layer Analysis using Wireshark12:30

    Analyze how the application layer of the OSI model uses ports like 80 and 443 to communicate with web servers, capturing HTTP and HTTPS traffic with Wireshark.

  • Understanding Presentation Layer7:48

    Explore the presentation layer of the OSI model, and how encoding, encryption, and compression prepare data for secure, computer-readable transmission.

  • Presentation Layer Analysis using Wireshark13:15

    Explore the presentation layer's encryption, decryption, compression, and encoding as demonstrated with Wireshark, including TLS handshakes, cipher suites, and encrypted https traffic.

  • Understanding Session Layer7:32

    Establish, maintain, and terminate sessions with a session ID to prevent data clashes. Mitigate session hijacking and fixation; analyze with Wireshark and apply session-layer encryption.

  • Session Layer Analysis using Wireshark4:29

    Explore session layer analysis with Wireshark and Network Miner, parsing pcaps and exporting data to csv or Excel, while inspecting IPs, ports, DNS requests, and credentials on unencrypted HTTP traffic.

  • Understanding Transport Layer18:26

    Master the transport layer of the OSI model, learn TCP vs UDP, sequencing, segmentation, reassembly, error correction, and flow control for reliable or fast data transfer.

  • Transport Layer Analysis using Wireshark17:03

    Analyze transport layer traffic with Wireshark to observe TCP handshake, HTTP get and post, port numbers, sequence and ack, and end-to-end connectivity in OSI model.

  • Understanding Network Layer14:17

    Explore the network layer of the OSI model, where routing and routed protocols determine paths and handle IP addressing. Identify routers and default gateways, routing tables, and path selection.

  • Understanding Datalink Layer9:08

    Explore the data link layer of the OSI model, focusing on mac addresses as physical addresses (a 48-bit hex mac address) and frames, CRC checks, error detection, switches, and bridging.

  • Understanding Physical Layer and Comparing OSI Model with TCPIP Model11:44

    Explore how data is converted to binary signals at the physical layer, transmitted over wired and wireless media, and how OSI encapsulation and decapsulation relate to TCP/IP mapping.

  • Bonus Lecture5:14

    Celebrate mastering the OSI model with practical insights into Wireshark, data flow from remote systems, and next steps in IP addressing and physical network connectivity.

Requirements

  • Basic Computer Knowledge

Description

In this course, you learn about the basics of network communication. All about how the data is transferred on the network and logical addressing to communicate on the network. Dhananjay has tried demystifying the concepts of network communication through the 7 layers of the OSI model.

Following topics are covered -


  1. Physical Layer

    • Understanding the basics of data transmission

    • Different types of cables (e.g., copper, fiber optics)

    • Connectors (e.g., RJ45)

    • Voltage levels and signaling

    • Data rates and bandwidth

  2. Data Link Layer

    • Introduction to MAC addresses

    • Ethernet and Ethernet frames

    • Error detection and correction

    • ARP (Address Resolution Protocol)

    • PPP (Point-to-Point Protocol)

    • Switching and bridging

  3. Network Layer

    • IP addressing (IPv4 and IPv6)

    • Routing protocols (e.g., RIP, OSPF)

    • Subnetting and CIDR

    • ICMP (Internet Control Message Protocol)

    • NAT (Network Address Translation)

    • VLANs (Virtual LANs)

  4. Transport Layer

    • TCP (Transmission Control Protocol)

    • UDP (User Datagram Protocol)

    • Port numbers

    • Flow control

    • Error detection and correction

    • Multiplexing and demultiplexing

  5. Session Layer

    • Session establishment, maintenance, and termination

    • Checkpointing and recovery

    • Synchronization

    • Session-layer protocols and APIs

  6. Presentation Layer

    • Data compression

    • Encryption

    • Data translation and formatting

    • Character encoding (ASCII, Unicode)

  7. Application Layer

    • HTTP (Hypertext Transfer Protocol)

    • FTP (File Transfer Protocol)

    • SMTP (Simple Mail Transfer Protocol)

    • DNS (Domain Name System)

    • Client-server architecture basics

Who this course is for:

  • Working professionals who want to upgrade to RHEL8
  • College Students or Freshers
  • working professionals who want to brushup their foundational skill to prepare for certifications like CISSP, CEH or CompTIA Security+
  • This course builds the coundation for N+ Skills

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