Basics of Open System Interconnection OSI model

Duration: 10 min

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Module outline

  1. Quantitative Ability: Speed Mathematics and Basic Mathematics, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Pipe and Cistern, Speed Time and Distance, Number System, HCF LCM, Data Interpretation, Age Problems, Mixture and Alligation, Partnership, Algebra, Sequence and Series (Series), Mensuration and Geometry, Arithmetic
  2. Reasoning Ability: Puzzle Solving (Puzzles), Seating Arrangements, Coding Decoding, Blood Relations, Directions (Direction Test), Syllogisms, Data Sufficiency, Ranking, Order and Sequence, Series (Number and Letter Series) (Numerical Relations and Reasoning), Logical Sequence Of Words, Calendar, Clock, Cubes & Dices, Analytical Reasoning (Counting Figures Reasoning), Data Arrangement, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning)
  3. Verbal Ability: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Vocabulary, Sentence Completion (Fill in the blanks), Active Passive Voice (Voice), Direct and Indirect Speech, Subject Verb Agreement (Verb Noun Agreement), Tenses, Preposition, Articles, Sentence Correction (Error Correction)
  4. Programming Basics (MCQs + Interview): C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  5. OOPs (MCQs + Interview): Object Oriented Programming (OOPS)
  6. DBMS (MCQs + Interview): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Transaction Management, Decomposition Properties & 4NF, Concurrency Control, Database Recovery, File Organization & Indexing, Relational Algebra, Database Security & Authorization
  7. SQL (MCQs + Interview): SQL
  8. Operating Systems (MCQs + Interview): Introduction to OS, Process Management, CPU Scheduling, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Process Synchronization, Disc Scheduling, File Management, Security
  9. Computer Networks (MCQs + Interview): 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, Network Security, Mobile Technology, Cloud Computing and IoT, Cyber and Info Security
  10. Coding: Coding Questions by Yash Sir
  11. HR Interview: MR & HR Interview Preparation
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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