Notes, summaries, assignments, exams, and exercises for Computer science for Secondary education

1.  A network technician is configuring port Security on a LAN switch interface. The security policy requires host MAC Addresses to be learned dynamically, stored in the address table, and Saved to the switch running configuration. Which command does the technician Need to add to the following configuration to implement this Policy? Switch(config)# interface fa0/1 
   Switch(config-if)# switchport mode access 
   Switch(config-if)# switchport port-security

·Switch(config-if)# switchport port-security mac-address sticky

2. On which switch interface would an Administrator configure an IP address so that the switch can be managed Remotely?

·VLAN 1

3. Refer to the exhibit. Match the packets with Their destination IP address to the exiting interface on the router.

Python Fundamentals: Practical Code Examples

This document presents a collection of basic Python code snippets, demonstrating fundamental programming concepts such as conditional statements, loops, data input, and list manipulation. Each example is designed to illustrate a specific programming principle, making it ideal for beginners learning Python.

Compare Car Top Speeds with Python

This Python script compares two user-entered car speeds to determine which is faster, showcasing basic input and conditional logic.

car_a = int(input("Please enter the top speed of a Ferrari: "))
car_b = int(input("Please enter the top speed of a Lamborghini: "))

if car_a >= car_b:
    print("The fastest car is a Ferrari.")
elif car_b > car_a:
    print("The

1. Demand Paging

In a standard virtual memory system, the operating system does not load an entire program into physical memory (RAM) at once. Instead, it uses Demand Paging—a strategy where pages are loaded into memory only when they are needed (on demand).

How It Works: The Page Fault Mechanism

1. CPU Reference: The CPU tries to access a specific virtual address.
2. Page Table Check: The Hardware (MMU) checks the page table entry for that page. Each entry has a Valid/Invalid (V/I) Bit:
   • Valid (1): The page is already in RAM. The address is translated, and execution continues.
   • Invalid (0): The page is currently on the disk (hard drive/SSD). This triggers a Page Fault interrupt.
3. OS Trap: The operating system takes control to handle the page fault.
4. Disk

Introduction to JavaScript Objects

In JavaScript, an object is a self-contained environment that stores data as a collection of properties and methods. A property is an association between a name (or key) and a value, while a method is a function associated with an object.

Think of an object as a real-world entity. For example, a Car is an object. It has properties like color, brand, and weight, and methods like start, drive, and brake.

// A simple conceptual look at an object
let car = {
    brand: "Tesla",       // Property (key: value)
    color: "Red",         // Property
    start: function() {   // Method
        console.log("Engine started!");
    }
};

Types of Objects in JavaScript

While almost everything in JavaScript is an object (or acts...

In C++, Input/Output (I/O) operations are managed through a hierarchy of classes collectively known as streams. A stream is an abstraction that represents a flow of data between a source (like a keyboard) and a destination (like a screen).

Here is a comprehensive breakdown of how C++ handles both unformatted and formatted I/O operations, along with the core stream mechanisms.

Streams, Insertion, and Extraction

At the heart of C++ I/O are the standard stream objects:

• cin: Standard input stream (usually the keyboard), an instance of istream.
• cout: Standard output stream (usually the screen), an instance of ostream.

The Insertion Operator (<<)

Used with cout to output data. It "inserts" data into the output stream.

cout << "Hello, World!";

Telephone Means and Equipment

Fixed individual devices (copper networks have been replaced by optical fiber networks)

Private branch exchanges (PBX): it connects calls between two destinations or ends

Function: call transfers among extensions, caller ID…

Types: IP PBXs call centers, they manage just phone calls contact centres, they not only manage phone calls but emails, SMS, online messages, faxes, etc.

Mobile devices: PDA, Smartphone

Services: Internet, e-mail, videoconference, digital camera, audio an Video quality player, an agenda, GPS, own, Operating system

Additional services offered by the telephone equipment

Common features

A.Fixed telephony: -Notice of charge(aviso de cargo) you receive info on the cost of a call Call forwarding(desvio

Image Processing

Imaging Technique

• Bitmap (Raster): Formed by pixels, each with a color. Programs: GIMP, Photoshop. Formats: GIF, JPEG, BMP, TIFF, PNG, PCX (Paintbrush), RAW, TGA, PSD (Photoshop), XCF (GIMP).
• Vector: Obtained using lines. Programs: Corel Draw, OpenOffice.org Draw, AutoCAD, QCad. Formats: DXF, CDR, DWG, ODG/SXD, SWF, AI, SFHx.
• 3D: Three-dimensional figures. Widely used in games. Programs: Virtual Hammer.

Memory Cards

• SD
• MMC
• XD
• Memory Stick

Image Properties

• Color Depth: Total number of bits used to encode an image. More depth means more shades.
• Brightness: Related to light intensity emitted over a given area.
• Contrast: Brightness difference between the maximum and minimum brightness.

Color Specification Systems

• RGB (Red, Green, Blue): Used

Evolution and History of the World Wide Web

1. Introduction and Origins of the Web

The World Wide Web (WWW) is an information system where documents and other web resources are identified by Uniform Resource Locators (URLs), interlinked by hypertext links, and accessible via the Internet.

• The Genesis: Invented by British scientist Sir Tim Berners-Lee in 1989 while working at CERN (European Organization for Nuclear Research).
• The Core Motivation: Developed to automate information-sharing among scientists globally, overcoming compatibility barriers between different computers and operating systems.
• The Core Building Blocks: By 1990, Berners-Lee defined the three fundamental technologies that remain the backbone of the modern web:

1. HTML (HyperText Markup

The application of several binary codes in microprocessor technique

Nbà + integer arithmetic, table/matrix indexing, event counting., C2à integer arithmetic, exponents in floating point notation.,Bcdà Faults:not effetive use of binary Word, absence of sign., Grayà code disksor bars to control position of moving elements., AScià Communication(text), service of: mosaic display, printers, autonomous keyboards.

Neuman:

It has a single storage system, Processor needs two clocks cycles. Dont use pipeline, Only one bus is used for both data transfers, older

Harvards:

It has two separated memories, 1 cycle if appropiate pipeling strategies, It has separate data and instruction busses, modern

Enumerate the phases of processor instruction execution.

Instruction...