TCP Header-Source-Destination Port Address

Duration: 4 min

This video lesson is available to enrolled students.

Return to /learn/RSSB-SENIOR-COMPUTER-INSTRUCTOR/paper-2-data-communication-and-network-security/transport-layer-services/tcp-header-fields/asset-tcp-header-source-destination-port-address after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Mensuration and Geometry, Age Problems, Arithmetic, Statistics, Probability, Profit and Loss, Simple Interest and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, Powers and Exponents (Surds and Indices), Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy
  3. Paper-1 & 2 | Data Interpretation: Data Interpretation
  4. Paper-1 & 2 | General Mental Ability: Mental Ability, RSSB Specific Videos - Mental Ability
  5. Paper-1 & 2 | Logical Reasoning and Analytical Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Syllogisms, Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Venn Diagram, Analogy, Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Arrangement, Logical Sequence Of Words, Crypt Arithmetic
  6. Paper-1 & 2 | Decision Making and Problem Solving: Selection Decision Table (Decision Making)
  7. Paper-1 | General Science: Physics, Biology, Chemistry, RSSB Specific Videos
  8. Paper-1 | General Awareness: State Wise GK, GK- Current Affairs
  9. Paper-2 | Fundamentals of Computer: Basics of COA, Number System, Floating Point Rep, Number Representation
  10. Paper - 2 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits
  11. Paper-2 | Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Linux OS, Distributed Systems
  12. Paper-2 | Database Management System: 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
  13. Paper-2 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  15. Paper 2 | Oops, C++, Java: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
  16. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  17. Paper 2 | Emerging Trends and AI: Emerging Tech Trends, Artificial Intelligence
  18. Paper-2 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Advanced Algorithms
  19. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, 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, Ethical Hacking
  20. Paper-2 I Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  21. Paper-2 | Computer Organization and Architecture: Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations
  22. Paper-2 | Web Development: JavaScript-Basics, HTML Basics, CSS, XML
  23. Pedagogy: Child Development, Concept of Pedagogy, Psychology, Theories, Inclusive Education, Experiential Pedagogy, Curriculum Framework & Reforms, National Education Policy (NEP) 2020
  24. Live Sessions: RSSB Live Sessions
  25. RSSB Paper 1 - Full Mock Tests:
  26. RSSB Paper 2 - Full Mock Tests:
  27. SCI Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces the TCP segment structure, emphasizing that a TCP header ranges from 20 to 60 bytes before application data. The instructor uses a slide titled “TCP Header” with a diagram separating the variable-length header from fixed data, then presents a table mapping the minimum 20-byte header fields. Key fields include source and destination port addresses, sequence number, acknowledgment number, and options/padding up to 40 bytes. The instructor annotates the slide with “20B,” “+40B,” and “60B” to show how options expand the header size, and draws red arrows pointing to the 16-bit source and destination port address fields. The lesson then defines these port fields as identifying the application program’s port number on both sending and receiving hosts. The teaching flow moves from overall segment layout to specific header fields, using visual cues such as underlining “16-bit field” and “port number.” Because the evidence is screenshot-based without audio, some spoken explanations are inferred from visible annotations and slide text.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a slide titled “TCP Header,” stating that a TCP segment consists of a 20- to 60-byte header followed by application data. A diagram shows the segment split into a variable-length Header and Data section, while a table below breaks down the 20-byte minimum header into fields such as source port address, destination port address, sequence number, acknowledgment number, and options/padding. The instructor points to the segment diagram with a pen and gestures toward the “Options and padding (up to 40 bytes)” row, establishing that options can increase the header from 20 to 60 bytes.

  2. 2:00 – 4:07 02:00-04:07

    The instructor writes “20B,” “+40B,” and “60B” on the left side of the slide to illustrate header size calculation, then writes “(18/32b)” above the TCP header diagram. Red arrows are drawn pointing to the “Source port address 16 bits” and “Destination port address 16 bits” fields. The slide transitions to define these as 16-bit fields representing the port number of the application program in both sending and receiving hosts, with key terms like “16-bit field” and “port number” underlined for emphasis.

The lecture builds from a general TCP segment model to specific header field definitions. First, the 20-60 byte header range is established through a diagram and table, clarifying that options account for the additional 40 bytes. Then, the instructor focuses on port addresses, using annotations and arrows to highlight their 16-bit size and functional role in identifying application ports. This progression supports exam revision by linking structural layout to field-level details, particularly the distinction between fixed 20-byte fields and optional padding. The visual emphasis on port addresses suggests they are a central concept, while sequence and acknowledgment numbers appear as supporting fields in the table.

Loading lesson…