Advantage and Disadvantage of Virtual Machines

Duration: 4 min

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Module outline

  1. Communication Round: Vocabulary, Subject Verb Agreement (Verb Noun Agreement), Tenses, 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), Direct and Indirect Speech, Active Passive Voice (Voice), Verbal Analogy (Word Based Analogy), Articles, Preposition, Conjunction, Sentence Construction, English Writing Ability, Communication Assessment
  2. Quantitative Aptitude: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Speed Time and Distance, Percentage, Average, Powers and Exponents (Surds and Indices), Time and Work, Mensuration and Geometry, Age Problems, Pipe and Cistern, Probability, Profit and Loss, Simple Interest and Compound Interest, Algebra
  3. Analytical and Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Directions (Direction Test), Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Logical Sequence Of Words, Puzzle Solving (Puzzles), Syllogisms, Seating Arrangements, Calendar, Clock, Blood Relations, Cubes & Dices, Venn Diagram, Analytical Reasoning (Counting Figures Reasoning)
  4. Cognizant Gaming Aptitude: Gamified / Game Based Aptitude
  5. Java (Cluster 1): Java
  6. ANSI SQL MySQL (Cluster 1,2,3): SQL
  7. HTML, CSS, JavaScript (Cluster 1,3): HTML, CSS, JavaScript
  8. Python (Cluster 2): Python for Placements by Yash Sir
  9. Cloud Fundamentals (Cluster 2): Emerging Tech Trends
  10. C# (Cluster 3): C#
  11. OOPs: Object Oriented Programming (OOPS)
  12. Technical Assessment (Coding): Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Pseudo Codes
  13. Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. DBMS: 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
  15. Operating Systems: 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
  16. Computer Networks: 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, Mobile Technology, Cloud Computing and IoT, Cyber and Info Security
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video presents a lecture on the advantages and disadvantages of virtual machines (VMs). The instructor begins by outlining the benefits of VMs, including the ability to run multiple operating systems on a single physical computer, which saves space, time, and management costs. VMs are also shown to support legacy applications, reducing migration costs, and provide integrated disaster recovery and application provisioning. The lecture then transitions to the disadvantages, highlighting that running multiple VMs on one physical machine can lead to unstable performance if infrastructure requirements are not met. It is also noted that VMs are less efficient and run slower than a full physical computer. The instructor uses a digital whiteboard to draw diagrams and write key terms like 'Cloud', 'PaaS', 'SaaS', and 'IaaS' to illustrate the concepts.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video starts with a slide titled 'Advantages of Virtual Machine' which lists three key benefits. The first advantage is that VMs can run multiple operating system environments on a single physical computer, saving physical space, time, and management costs. The second is that VMs support legacy applications, reducing the cost of migrating to a new operating system. The third is that VMs can provide integrated disaster recovery and application provisioning options. The instructor highlights these points with a yellow marker and begins to draw a diagram on the right side of the screen, writing 'Cloud' and 'Cloud Service Provider' to illustrate the concept of cloud computing.

  2. 2:00 – 4:19 02:00-04:19

    The instructor continues to build on the diagram, adding 'PaaS' (Platform as a Service) and 'SaaS' (Software as a Service) to the cloud model. The slide then transitions to the 'Disadvantages of Virtual Machine' section. The first disadvantage listed is that running multiple virtual machines on one physical machine can result in unstable performance if infrastructure requirements are not met. The second disadvantage is that virtual machines are less efficient and run slower than a full physical computer. The instructor draws a simple diagram of a physical computer and a virtual machine to visually represent this performance difference.

The lecture provides a balanced overview of virtual machines by first detailing their significant advantages, such as cost and space savings, support for legacy systems, and robust disaster recovery. It then logically transitions to the disadvantages, emphasizing performance limitations and inefficiency. The use of a digital whiteboard to draw diagrams of cloud services (PaaS, SaaS) and the comparison between physical and virtual machines effectively illustrates the core concepts, making the information accessible and reinforcing the key points of the lesson.

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