Class B

Duration: 6 min

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Inside: a video lesson and guided study material.

Module outline

  1. Quantitative Aptitude: Number System, Divisibility Rules, HCF LCM, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Mixture and Alligation, Partnership, Age Problems, Time and Work, Pipe and Cistern, Speed Time and Distance, Algebra, Arithmetic, Data Interpretation, Sequence and Series (Series), Logarithm, Powers and Exponents (Surds and Indices), Permutation and Combination, Probability, Speed Mathematics and Basic Mathematics, Trigonometry
  2. Logical Reasoning: Coding Decoding, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Seating Arrangements, Puzzle Solving (Puzzles), Data Arrangement, Syllogisms, Inequality, Data Sufficiency, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Series (Number and Letter Series) (Numerical Relations and Reasoning), Venn Diagram, Logical Sequence Of Words, Calendar, Clock, Cubes & Dices, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning)
  3. Verbal Ability: Noun, Pronoun, Adjectives, Verb, Adverb, Tenses, Subject Verb Agreement (Verb Noun Agreement), Articles, Preposition, Conjunction, Modals, Determiner, Vocabulary, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Active Passive Voice (Voice), Direct and Indirect Speech, Sentence Construction
  4. Data Structures (Domain Test): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  5. Algorithms (Domain Test):
  6. OOPs (Domain Test): Object Oriented Programming (OOPS)
  7. DBMS (Domain Test): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  8. SQL (Domain Test): SQL
  9. Operating Systems (Domain Test): Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  10. Computer Networks (Domain Test): 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, Cloud Computing and IoT, Cyber and Info Security
  11. Coding: Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  12. Written English Test: English Writing Ability
  13. Psychometric Test: Behavioral Assessment (Behavioral Competency Profiling) (Psychometric Test)
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture segment introduces Class B IP addressing within the context of classful IPv4 networks. The instructor presents a slide titled “Class B” stating that in Class B, NetID = 16 bits and HostID = 16 bits. The first two bits are reserved as “10” in binary, which fixes the range of the first octet to [128, 191] in dotted decimal notation. The slide also gives the total number of networks available in Class B as 2^14 (16,384) and the total number of hosts that can be configured in every network as 2^16 − 2 (65,534). A comparison table at the bottom of the slide lists Class Prefixes and First byte ranges for Classes A through E, with Class B shown as 128 to 191. The instructor uses hand-drawn circles and arrows to highlight the key values 2^14 (16,384) and 2^16 − 2 (65,534), linking them to a small sketch on the right. Earlier in the segment, a transition from Class A is visible, where NetID = 8 bits and HostID = 24 bits, first bit reserved as “0”, range [0, 127], and reserved addresses such as 0.0.0.0 for broadcasting and 127.0.0.1 for loopback are mentioned.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens on a “Class B” slide listing NetID = 16 bits and HostID = 16, the binary prefix “10”, first octet range [128, 191], and totals of 2^30 networks and 2^14 hosts. A transition to a “Class A” slide is visible, showing NetID = 8 bits and HostID = 24, first bit “0”, range [0, 127], and reserved addresses 0.0.0.0 (broadcast) and 127.0.0.1 (loopback). A comparison table of Class Prefixes and First byte ranges appears at the bottom.

  2. 2:00 – 5:00 02:00-05:00

    The instructor returns to the “Class B” slide, emphasizing that NetID = 16 bits and HostID = 16, with the first two bits reserved as “10” in binary. The range of the 1st octet is [128, 191]. A hand-drawn oval circles the value (16,384) next to “Total number of networks available in class B is 2^14”. The instructor points with a pen at “Total number of hosts that can be configured in every network in class B is 2^16 − 2 (65,534)”. A bottom diagram shows four “8 bits” segments with Class A–E rows labeled Prefix/Suffix, beside a “Class Prefixes / First byte” table.

  3. 5:00 – 6:09 05:00-06:09

    The “Class B” slide remains on screen with red hand-drawn circles highlighting “2^14 (16,384)” and “2^16 − 2 (65,534)”, with arrows linking them to a small sketch on the right. The bottom-left diagram shows four “8 bits” segments and rows for Class A through E with shaded Prefix and Suffix blocks. The right-hand table headed “Class | Prefixes | First byte” lists B as n = 16 bits with first byte “128 to 191”. The instructor continues pointing at the key values while explaining.

The central teaching point is the structure and capacity of Class B IPv4 addresses. The instructor defines NetID as 16 bits and HostID as 16 bits, identifies the class by the binary prefix “10”, and derives the first octet range [128, 191]. The total number of networks is given as 2^14 (16,384), and the usable hosts per network as 2^16 − 2 (65,534), with the subtraction of two accounts for network and broadcast addresses. A comparison table across Classes A–E reinforces how prefix bits determine first-byte ranges. The instructor uses hand-drawn circles, arrows, and pen gestures to draw attention to the key numerical values. The segment also briefly references Class A (NetID 8, HostID 24, range [0,127], reserved addresses) to provide context before focusing on Class B. The visual aids include a 32-bit IP structure diagram with four 8-bit segments and shaded Prefix/Suffix blocks for each class.

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