CHAPTER-8 COMPUTER NETWORKS 8.1 Evolution of Networking: 8.1.1 Introduction to Computer Networks: Network: – To connect the more than one devices via a medium, is called network. Why do we need network? 1. Fast and Secure Communication 2. Resource sharing 3. Reduce Cost 8.1.2 Evolution of Network: ARPANET: The Advanced Research Projects Agency Network (ARPANET) was an early packet switching…
(CBSE Class XII – Computer Science / Informatics Practices) Networking Devices, Network Topologies & Network Protocols 1. Networking Devices We use Networking Devices to connect computers and other devices in a network. These are hardware components that help us make a network. 1.1 Modem (Modulator-Demodulator) A Modem converts signals to analog and analog to digital….
1. Foundations of Networking and System Architecture The architecture of data management has undergone a strategic evolution, shifting from localized, isolated storage to a globalized, centralized networking model. In the pre-networking era—exemplified by traditional banking—data was confined to physical registers or local hard drives. A customer’s record existed only at their specific “home branch.” If…
1. Strategic Introduction to the 2027 Board Examination The final window before the CBSE Class 12 Computer Science exam is not merely for reading; it is for high-stakes, tactical alignment. Transforming 365 days of curriculum into exam-ready precision requires the “Science Adda247” methodology. With 15 years of board-level experience, I have distilled this revision to…
1. Introduction to Data Persistence In software architecture, data is the most critical asset, yet it is inherently ephemeral when confined to Random Access Memory (RAM). As a developer, the “So What?” factor of file handling is absolute: without it, your program suffers from “Ghajini-style” short-term memory loss. The moment the power cuts or the…
1. Introduction to Python Functions A function is a reusable block of code that only executes when it is called. Core Characteristics 2. The Three Types of Functions in Python Python categorizes functions based on their source and accessibility. Type Definition Examples Built-in Functions Pre-defined functions always available in the Python interpreter. print(), input(), len(),…
1. Introduction to Python Exceptions In professional software development, the gap between a functional script and a robust application is defined by how the system manages the unexpected. An Exception is a specific type of error occurring during a program’s execution, while Handling refers to the strategic architectural pattern used to manage these events without…
1. Fundamentals of Functions Definition and Role In Python, functions are sub-programs—modular segments of a larger program designed to execute specific, well-defined tasks. The fundamental philosophy is Modularity and Reusability, summarized by the mantra: “Write Once, Use Many Times.” The “Zero-Mark” Paradox (Exam Strategy) Board Consultant Insight: Students often neglect this chapter because direct questions…
1. About Python Python is a high-level programming language developed by Guido Van Rossum. It is an interpreted and platform-independent language, meaning the exact same code can run on any operating system. Python is completely free to use, based on the ABC and Modula-3 programming languages, and supports both procedural and object-oriented programming approaches. 2….
