CSMA-CD Part - 2

Duration: 5 min

This video lesson is available to enrolled students.

Return to /learn/HPSC-PGT-COMPUTER-SCIENCE/computer-networks/dll-access-control/csmacd/asset-csma-cd-part-2 after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. HPSC Interview Preparation: Interview Preparation
  2. Python Language: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis, DSA using Python
  3. Data Structure & Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Sorting Algorithms, Minimum Spanning Trees, Time Complexity Analysis, Graph Theory, Shortest Path Algos
  4. Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security
  5. Computer System & Organisation: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer
  6. Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, SQL, File Organization & Indexing, Transaction Management, Concurrency Control
  7. Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling
  8. Digital Logic & Circuits: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  9. Theory Of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Pushdown Automata & CFG, Turing Machines, Moore & Mealy Machines
  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. Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, Data Warehousing & Mining
  12. Introduction to Emerging Trends: Emerging Tech Trends
  13. Digital Society & Cyber Law: Society, Law & Ethics
  14. HPSC PGT Previous Year Paper:
  15. HPSC Assistant Professor Previous Year Paper:
  16. Live Sessions: HPSC Live Sessions, EMRS TGT/PGT Live Class
  17. Full Mock Test:
  18. HPSC PGT - MOCK Test Series:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture segment introduces the CSMA-CD protocol flowchart, defining key variables such as $K$ (Number of attempts) and $T_p$ (Maximum propagation time). The instructor explains the process starting with applying persistence methods like 1-persistent, nonpersistent, or p-persistent. Upon transmission, the system checks for collisions; if detected, it sends a jamming signal and increments $K$. The back-off procedure involves calculating a random number $R$ between 0 and $2^K - 1$, then waiting for time $T_B = R \times T_p$. The total transmission time is noted as $T_T = 2 \times T_p$.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The lecture begins with a flowchart displayed on screen, defining variables $K$ and $T_p$. The instructor points to the step "Apply one of the persistence methods (1-persistent, nonpersistent, or p persistent)". A handwritten formula $T_T = 2 \times T_p$ appears in the top right corner. The flowchart illustrates the initial transmission phase and collision detection logic, with decision diamonds checking if "(Transmission done) or (Collision detected)."

  2. 2:00 – 4:58 02:00-04:58

    The instructor details the collision handling mechanism, specifically pointing to a circled box labeled "Send a jamming signal". He explains the back-off procedure where $T_B = R \times T_p$ or $R \times T_{fr}$ is calculated. The flowchart shows the loop where $K$ increments after a collision, and a random number $R$ is chosen between 0 and $2^K - 1$. The diagram concludes with the "Wait TBtime" step before retrying transmission.

The video provides a structured walkthrough of the CSMA-CD protocol using a visual flowchart. Key concepts include persistence methods for channel access, collision detection via jamming signals, and the exponential back-off algorithm. The instructor emphasizes the mathematical relationships between propagation time ($T_p$), transmission attempts ($K$), and back-off duration ($T_B$). The formula $T_T = 2 \times T_p$ represents the round-trip propagation time, critical for collision detection windows. The back-off mechanism ensures network stability by randomizing retransmission times based on the number of previous collisions.

Loading lesson…