Basics of Open System Interconnection OSI model

Duration: 10 min

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Inside: a video lesson and guided study material.

Module outline

  1. About Course: About the Course
  2. Paper 2 | Digital Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep
  3. Paper 2 | Computer Organization And Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Control Unit Design, Instr Formats & Modes, Programming the Basic Computer
  4. Paper 2 | Analog And Digital Communication: Introduction to Communication Systems & Random Signals, Analog Communication Systems, Information Theory & Digital Communication Fundamentals, Digital Modulation & Detection Techniques, Error Control, Synchronization & Multiple Access Techniques
  5. Paper 2 | Programming in C: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  6. Paper 2 | Data Structures And Programming: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Java, OOPS with C++, Java Fundamentals, Array, String, IO & References
  7. Paper 2 | Algorithms: Algorithm Analysis, Sorting Algorithms, Time Complexity Analysis, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  8. Paper 2 | Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  9. Paper 2 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS, Linux OS
  10. Paper 2 | Databases: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Relational Calculus, File Organization & Indexing, Transaction Management, Concurrency Control
  11. Paper 2 | Information Systems and Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  12. Paper 2 | Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware Basics
  13. Paper 2 | Internet & Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, HTML Basics, JavaScript-Basics, CSS, XML, HTML5
  14. Paper 2 | Cyber Security And Emerging Technologies: Emerging Tech Trends, Internet of Things
  15. Paper 2 | Cloud Technology: Cloud Computing
  16. Paper 2 | Probability and statistics: Probability, Statistics
  17. Paper-1 English: Vocabulary, Preposition, Articles, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Cloze Test (Cloze Passage), Sentence Construction
  18. Paper 1 General Mental Ability & Logical reasoning: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Percentage, Average, Powers and Exponents (Surds and Indices), Algebra, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Pipe and Cistern, Mensuration and Geometry, Mental Ability, Age Problems, Partnership, Arithmetic, Speed Mathematics and Basic Mathematics, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Selection Decision Table (Decision Making), Logical Sequence Of Words, Venn Diagram, Analogy
  19. Paper-1 General Knowledge & Current Affairs: State Wise GK, History, Geography, GK- Current Affairs, Static General Knowledge
  20. Full Length Mock Test:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The lecture introduces the OSI model as a conceptual framework proposed by ISO to enable communication between heterogeneous systems. It emphasizes that the OSI model is not a protocol but an architectural reference, consisting of seven layers: Application, Presentation, Session, Transport, Network, Data Link, and Physical. The instructor uses diagrams to show encapsulation, where headers (AH, PH, SH, TH, NH, DH) are added to data as it moves down the stack, ending in bits on the media. A protocol table maps real-world protocols like TCP, UDP, IP, ICMP, ARP, and RARP to their respective layers, contrasting the OSI model as 'Directive Principles' with actual protocols as the 'Constitution'.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The slide titled 'Network Models' introduces the OSI model, noting that ISO proposed it to allow two systems to communicate regardless of architecture. A seven-layer diagram is shown alongside a staircase encapsulation model with headers AH, PH, SH, TH, NH, and DH. The instructor enters the frame to begin explaining the layered task concept.

  2. 2:00 – 5:00 02:00-05:00

    The lecture clarifies that an open system allows different systems to communicate without changing underlying hardware or software logic. A key transition occurs where the instructor states, 'The OSI model is not a protocol,' but rather a model for designing flexible and robust network architectures. A protocol table appears, mapping TCP/UDP to Transport and IP/ICMP to Network.

  3. 5:00 – 10:00 05:00-10:00

    The instructor elaborates on the seven separate but related layers, using a stylus to point at the encapsulation diagram. The diagrams are labeled 'Directive Principles' for the OSI stack and 'Constitution' for the protocol table. The slide text emphasizes that each layer defines a part of the process of moving information across a network.

  4. 10:00 – 10:02 10:00-10:02

    The final view shows the complete 'Constitution' chart mapping additional protocols like SNMP, NTP, HTTP, and FTP to their layers. The summary reinforces that the OSI model provides a standardized framework for understanding how data is encapsulated and transmitted through different system architectures.

The lecture provides a foundational overview of the OSI model, focusing on its role as an architectural reference rather than a specific protocol. Key concepts include the seven-layer hierarchy and the process of encapsulation, where data is wrapped with headers at each level. The instructor uses a metaphor comparing the OSI model to 'Directive Principles' and actual protocols like TCP/IP to the 'Constitution,' highlighting that while the model provides a standard for design, real-world implementations vary. This distinction is crucial for students to understand that the OSI model is a tool for analysis and design, ensuring interoperability across different hardware and software environments.

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