Basics of Flow Control in Data Link Layer

Duration: 7 min

This video lesson is available to enrolled students.

Return to /learn/SSC-JE-IMD-SCIENTIFIC-ASSISTANT-COMPUTER-SCIENCE/computer-networks/dll-flow-control/basics-delay-analysis/asset-basics-of-flow-control-in-data-link-layer after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. General Intelligence & Reasoning: Analogy, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Logical Sequence Of Words, Syllogisms, Venn Diagram, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Data Sufficiency, Puzzle Solving (Puzzles), Data Arrangement, Cubes & Dices, Calendar, Clock, Arithmetic, Number System, HCF LCM, Verbal Analogy (Word Based Analogy), Visual Recognition and Figure Completion, Paper Folding and Cutting, Transformation of Shapes, Clocks and Calendars, Direction Sense, Cubes and Dice, Patterns in Two-Dimensional Figures, Seating Arrangements, Analogy and Classification, Logical Deduction and Induction, Alphabet and Word Tests, Mathematical Operations, Series Completion, Simplification and Approximation, Coding and Decoding, Numerical Reasoning, Assembling and Grouping of Shapes, Three-Dimensional Patterns and Visualization, Vocabulary, Number System, Averages, Mixtures and Alligation, Simple and Compound Interest, Percentages, Algebra, Speed, Time and Distance, Seating and Arrangement Puzzles, Traverse Surveying, Order, Ranking and Sequence, Constraint Puzzles, Syllogisms and Venn Diagrams, Reading Comprehension, Critical Reasoning, Permutations and Combinations, Narrative Sequencing, Project Monitoring, Resources and Safety, Profit, Loss and Discount, Ratio and Proportion, Time and Work, Mensuration, Data Interpretation, Powers, Surds and Logarithms, Sequences and Series, Articles and Determiners, Sentence Completion, Data Sufficiency, Blood Relations, Simple Interest and Compound Interest, Mixture and Alligation, Sequence and Series (Series), Speed Time and Distance, Algebra, Profit and Loss, Powers and Exponents (Surds and Indices), Permutation and Combination
  2. General Awareness: Physics, Chemistry, Biology, History, Geography, Polity, Indian Economy, Environment, Static General Knowledge, GK- Current Affairs, Artificial Intelligence, MS Office Applications, Terms & Abbreviations, Keyboard Shortcuts, Evolution of Indian Banking (Banking & Financial Awareness), Emerging Tech Trends
  3. Engineering Mathematics: Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Linear Algebra, Calculus, Probability, Statistics, Signal Space and Optimum Detection, Probability, Statistics
  4. Digital Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep, Number Systems and Codes, Registers and Counters, Boolean Algebra and Logic Gates, Microprocessors and Microcontrollers, Logic Families and CMOS Logic, Microprocessors, Logic Gates and Boolean Algebra, Minimization of Boolean Functions, Timing, Hazards and Testing, Logic Families, Combinational Logic Design, Arithmetic Circuits, Waveform Generators and Timer Circuits, Semiconductor Memories and Programmable Logic Devices, Combinational Logic Circuits, Latches and Flip-Flops, Finite State Machines, Sequential Circuits and State Machines, Minimization of Boolean Functions, Arithmetic Circuits, Latches and Flip-Flops, Number Systems and Codes, Registers and Counters
  5. Computer Organisation & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer, Register Transfer and Microoperations, Semiconductor Memories and Programmable Logic, Processor Organization and Instructions, Memory Hierarchy and Input/Output, Registers and Counters
  6. Programming & Data Structures: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, HTML Basics, OOPS with C++, Java, Object Oriented Technology
  7. Databases: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, Database Security & Authorization
  8. Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  9. Theory of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Complexity Theory
  10. 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
  11. Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Security, Windows OS, Distributed Systems, Unix OS, Linux OS
  12. Computer Networks: Introduction to CN, 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, Data Communication, Website, Browser & Services, Web Design & Development, Network Security, Cyber Threats and Malware Attacks, Cyber Safety and Security
  13. Full Length Mock Tests:
  14. Sectional Tests:
  15. Paper 2 - Full-length Mock Tests:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces flow and error control mechanisms within the Data Link Layer of computer networks. The instructor begins by defining flow control as a method to prevent overwhelming the receiver, utilizing memory buffers for temporary data storage. Key concepts include the necessity of checking incoming data before processing and the requirement for receivers to signal senders to halt transmission when buffers fill. The lesson transitions to error control, defined as the detection and retransmission of lost or corrupt frames. The instructor introduces Automatic Repeat Request (ARQ) as the primary implementation method, classifying protocols based on channel types: noiseless channels utilize simple methods like Stop-and-Wait, while noisy channels require complex protocols such as Go-Back-N and Selective Repeat. Visual aids include whiteboard diagrams of devices A and B, buffer filling illustrations with cross-hatching, and hierarchical classifications of ARQ protocols.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor introduces flow control concepts using a slide titled "FLOW AND ERROR CONTROL" which lists four numbered points. Point 1 states data flow must not overwhelm the receiver, while Point 2 highlights buffer usage for storing incoming data. The instructor draws a diagram with two boxes labeled "A" and "B" connected by a line to illustrate sender-receiver communication. Text on screen emphasizes that receiving devices have limited processing speeds and memory buffers, requiring them to inform the sender before limits are reached.

  2. 2:00 – 5:00 02:00-05:00

    The lecture transitions to error control mechanisms, defining it as detection and retransmission of lost or corrupt frames. The instructor uses a whiteboard to draw diagrams connecting devices A and B, illustrating buffering scenarios where cross-hatching demonstrates buffer filling when data arrives faster than processing speed. Visible text outlines that flow control prevents receiver overwhelm by storing data until processed. The lesson introduces Automatic Repeat Request (ARQ) as a simple implementation where damaged frames trigger retransmission, marking the shift from flow management to error handling.

  3. 5:00 – 7:18 05:00-07:18

    The instructor explains error control protocols, specifically focusing on Automatic Repeat Request (ARQ) classifications. A hierarchical diagram classifies protocols for noiseless versus noisy channels, with the instructor using gestures to distinguish between these types. Specific ARQ protocols listed include Stop-and-Wait for noiseless channels, described as the simplest method, and Go-Back-N and Selective Repeat for noisy environments. Text on screen defines error control as both detection and correction, though the data link layer primarily focuses on retransmission methods.

The lecture systematically progresses from flow control to error control within the Data Link Layer. Flow control is established as a buffer management technique where receivers signal senders to halt transmission when memory limits approach, preventing data loss due to processing speed mismatches. Error control is then introduced as a mechanism for handling lost or corrupt frames through detection and retransmission. The instructor categorizes ARQ protocols into those suitable for noiseless channels, such as Stop-and-Wait, and those designed for noisy environments like Go-Back-N and Selective Repeat. This progression highlights the layered approach to ensuring reliable data transmission, starting with rate matching and advancing to integrity verification.

Loading lesson…