TCP Connection Termination Three-Way Handshake

Duration: 4 min

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Module outline

  1. Paper 1 | Reasoning Test: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Blood Relations, Puzzle Solving (Puzzles), Venn Diagram, Analogy, Ranking, Order and Sequence, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Selection Decision Table (Decision Making), Logical Sequence Of Words, Cubes & Dices, Analytical Reasoning (Counting Figures Reasoning), Calendar, Alphabet and Word Tests, Numerical Reasoning, Number System, Averages, Mixtures and Alligation, Percentages, Series Completion, Analogy and Classification, Patterns in Two-Dimensional Figures, Coding and Decoding, Mathematical Operations, Direction Sense, Algebra, Logical Deduction and Induction, Syllogisms and Venn Diagrams, Critical Reasoning, Order, Ranking and Sequence, Reading Comprehension, Profit, Loss and Discount, Constraint Puzzles, Speed, Time and Distance, Traverse Surveying, Ratio and Proportion, Time and Work, Mensuration, Permutations and Combinations, Clocks and Calendars, Data Interpretation, Assembling and Grouping of Shapes, Transformation of Shapes, Three-Dimensional Patterns and Visualization, Cubes and Dice, Vocabulary, Blood Relations, Data Sufficiency
  2. Paper 1 | Numerical Analysis: Number System, HCF LCM, Percentage, Ratio and Proportion (Ratios), Average, Sequence and Series (Series), Powers and Exponents (Surds and Indices), Algebra, Statistics, Data Interpretation, Mental Ability, Arithmetic, Logarithm, Profit and Loss, Simple Interest and Compound Interest, Speed Time and Distance, Mixture and Alligation, Mensuration and Geometry, Permutation and Combination, Probability, Sequences and Series, Powers, Surds and Logarithms, Subject-Verb Agreement, Sentence Completion, Geometry, Sentence Structure and Correction, Data Sufficiency, Trigonometry, Measurement and Quantity Take-Off, Signal Space and Optimum Detection, Probability, Statistics, Algebra, Time and Work, Speed, Time and Distance, Data Interpretation, Graph Theory, Combinatorics
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  4. Paper 1 | DBMS: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Transaction Management, Concurrency Control, Relational Calculus, Database Security & Authorization, Database Recovery
  5. Paper 1 | Data Communication & Network: 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, Network Security, Security in Mobile and Wireless Computing, Input Output Organisation, File Management, Hardware Basics, Terms & Abbreviations, Protocols & Services, Network Access Technologies, Cyber Safety and Security, Basics of COA
  6. Paper 2 | System Analysis & Design: Fundamentals of Systems and Information Systems, SDLC and Development Approaches, Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Documentation and Software Requirements Specification (SRS), SDD and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, Security, Risk Management & Maintenance, extras
  7. Paper 2 | Programming Language (Java): Java Fundamentals, OOPS with Java, Array, String, IO & References, Generic & Collections, Multithreading, Java, Miscellaneous, Control Flow, OOPS with C++, Stack, C Fundamentals, Arrays & Pointers, Object Oriented Technology, Control Flow & Looping, Introduction to Python
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture segment explains TCP connection termination using the three-way handshake, focusing on active and passive close. The slide shows a timing diagram with client and server transport layers exchanging FIN, FIN+ACK, and ACK segments. The instructor highlights that a FIN segment consumes one sequence number if it carries no data, using red circles and arrows to emphasize the active close on the client side and passive close on the server side. The sequence numbers progress from seq:x/ack:y to seq:y/ack:x+1 and finally seq:x+1/ack:y+1, illustrating how each side acknowledges the other's FIN and closes its direction of communication.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The slide titled 'Connection Termination (Three-way handshaking)' introduces the termination process with a timing diagram showing Client and Server transport layers. The instructor circles 'Active close' on the client side in red, indicating where the client initiates termination by sending a FIN segment with seq:x/ack:y. The diagram shows the server responding with FIN+ACK (seq:y/ack:x+1), and the client acknowledging with ACK (seq:x+1/ack:y+1). Red arrows point to the seq field and FIN flag box, emphasizing that the client's close command triggers the first FIN segment.

  2. 2:00 – 3:53 02:00-03:53

    The instructor underlines the bullet point stating 'The FIN segment consumes one sequence number if it does not carry data,' highlighting this key rule. Red curved arrows are drawn above the diagram to trace the flow of segments between client and server. The 'Passive close' label on the server side is shown in blue, contrasting with the red-circled 'Active close.' Two 'Connection closed' markers appear on the timeline, indicating when each side completes its termination. The instructor uses red ellipses to circle both the 'Active close' label and the FIN flag within segments, reinforcing which side initiates and how the flags propagate through the handshake.

The core teaching point is that TCP termination requires three segments: the initiating side sends FIN, the other responds with FIN+ACK, and the initiator acknowledges. The critical rule emphasized is that a FIN consumes one sequence number only when it carries no data, which affects how seq and ack values increment. Active close refers to the side that initiates termination (client in this example), while passive close is the responding side. The diagram's progression from seq:x to seq:x+1 and ack:y to ack:y+1 demonstrates how each FIN advances the sequence number by one, ensuring both directions of communication are properly closed before the connection is fully terminated.

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