Notes, summaries, assignments, exams, and problems for Technology

The Internet: A Global Network

The Internet is a global network of interconnected computer networks, linking billions of devices worldwide using TCP/IP. It comprises millions of networks, including private, public, academic, business, and government, and provides extensive information resources.

The History of the Internet

The Internet, originating from ARPANet, an experimental network created in the 1960s by the US military, was launched online in 1969 under a contract by ARPA, connecting four US universities. The history of the Internet reflects the continuous growth of this network, connecting millions of people, businesses, governments, schools, and universities.

The ARPANet

The ARPAnet, created in 1969, began with four computers connecting.... Continue reading "The Internet: A Comprehensive Overview" »

ELECTRICAL INSTALLATIONS:
The electricity used to meet our energy needs (housing, buildings and industries) But there are serious dangers such as fires and electrocucions if facilities do not meet the appropriate security.
Low Voltage Electrotechnical Regulations (REBT) technical conditions and guarantees must be met by electrical installations connected to a low voltage supply in order to:
-Preserve the safety of persons and property.
-Ensure the normal operation of these facilities and prevent disruptions that could cause other facilities and prevent disruptions that could cause other facilities and services.
-Contribute to the technical reliability and efficiency of economic facilities.
Complementary technical instructions (ITC - BT)... Continue reading "Domestic Electrical Installations" »

Cloud Computing Essentials

What is a Distributed File System (DFS)?

A distributed file system (DFS) in cloud computing manages data across multiple servers for scalability, fault tolerance, and efficient access. It replicates data for high availability, balances loads, ensures data consistency, and can be cost-effective.

Examples include Hadoop Distributed File System (HDFS), Google File System (GFS), Amazon Elastic File System (EFS), and Azure Blob Storage. DFS is essential for handling large-scale data storage and processing in cloud environments.

HDFS Architecture

HDFS: Hadoop Distributed File System. Google published its paper GFS and on the basis of that HDFS was developed.

It states that the files will be broken into blocks and stored in nodes... Continue reading "Cloud Computing Essentials: DFS, HDFS, Security, and Virtualization" »

Windows Server 2016 Disk Storage Types: Basic vs. Dynamic

Windows Server 2016 supports two essential disk storage types: basic disks and dynamic disks. They differ significantly in how they manage partitions and volumes:

• Basic Disks: Use traditional disk management techniques and contain primary partitions, extended partitions, and logical drives.
• Dynamic Disks: Do not use traditional partitioning. Dynamic disks offer greater flexibility than basic disks, providing virtually no restriction on the number of volumes that can be created on a single disk.

Purpose and Function of a Subnet Mask

A subnet mask is a crucial component in networking used to divide an IP address into two distinct parts: the network portion and the host portion. Its primary... Continue reading "Windows Server 2016 Fundamentals: Storage, Networking, and Security" »

Mastering Microsoft Access Field Creation

Methods for Creating Fields in Access

There are two primary ways to create a field in Microsoft Access:

1. Adding fields using a predefined template.
2. Using an existing field copied from another table.

Access Field Templates Collection

Access includes a collection of field templates designed to significantly reduce the time required when setting up new fields.

Understanding Multi-Valued Fields in Access 2007

Multi-valued fields are suitable for specific scenarios, particularly when using Office Access 2007 to interact with information stored in Microsoft Windows SharePoint Services.

Defining Field Properties in Datasheet View

Field properties can be defined in the Datasheet View. Follow these steps:

1. Open the table

... Continue reading "Mastering Microsoft Access Field Creation and Data Types" »

#useradd nombredeusuario :: para crear usuarios

#passwd :: nombredelusuario

#groupadd :: nombredelgrupo :: (forma normal)

#groupadd -g 600 nombredelgrupo :: (guid sobre 650)

#userdel nombredelusuario :: para deletear usuarios

#groupdelnombredelgrupo :: borrar el grupo

#usermod -G nombredelgrupo nombredeusuario :: para asignar usuario a grupo.

opcion 2: editar archivo /etc/group -> grupo:x:600:usuarioqueseagregara

#nano /etc/shadow :: para poder ver los usuarios y poder bloquearlos

#passwd -l nombredeusuario :: para bloquear usuario

#passwd -u nombredeusuario :: para desbloquear usuario

#sudo passwd :: para cambiar la contraseña de root

# tail /etc/passwd :: paraver informacion de usuarios

#su nombredelotrousuario :: para iniciar sesion como el usuario... Continue reading "Centos 5.5" »

Core Concepts of Palo Alto Networks

Strata

PA-Series: PA-220, PA-800, PA-3200, PA-5200, PA-7000

VM Series: VM-50, VM-100, VM-300, VM-500, VM-700

• Amazon Web Services
• Cisco ACI
• Citrix NetScaler SDX
• Google Cloud Platform
• Kernel-based Virtual Machine (KVM)
• Microsoft Azure and Microsoft Hyper-V
• OpenStack
• VMware ESXi, VMware NSX, and VMware vCloud Air

Panorama

• Policy Management
• Centralized Visibility
• Network Security Insights
• Automated Threat Response
• Network Security Management
• Enterprise-Level Reporting and Administration

Prisma (Cloud, SASE, SaaS, VM Series ML-Powered NGFWs)

• Cloud Security - Delivers complete security across the development lifecycle on any cloud.
• Prisma Cloud - Cloud Security Posture Management and Workload Protection (Uses API)
  • Alibaba Cloud
  • Amazon

... Continue reading "Palo Alto Networks: Core Concepts and Product Ecosystem" »

Computer Network and Its Types

A network refers to a collection of interconnected nodes or entities that can communicate and share information with each other. These nodes can be computers, devices, or even people. Networks are used to facilitate the exchange of data, resources, or services among the connected entities.

Types of Networks

There are several types of networks, including:

• Local Area Network (LAN): LANs are typically limited to a small geographic area, such as a home, office, or campus. They are used for connecting devices within a relatively close proximity, often using Ethernet cables or Wi-Fi.
• Wide Area Network (WAN): WANs cover larger geographical areas and connect LANs over long distances. The internet is the most extensive example

... Continue reading "Computer Networks: Types and Definitions" »

Introduction

In the coming years, the manufacture of mirrors and glass will grow because the demand will be higher.

The process of making glass consists of melting certain substances until they solidify. This process dates back to a time before 2000 BC when glass was worked by hand using molds. Over time, glass has been used to make containers, decorative objects such as jewelry, and also in architecture and industry. At present, its recycling provides an important benefit to conserve the environment and reduce pollution.

Hypothesis

How viable is it to assemble a glass processing plant in Ecuador?

Ecuador does not manufacture glass; it is always imported. What they do in Ecuador is the processing of glass, such as:

• Polishing
• Vice-lane
• Stacking and

... Continue reading "Glass Processing Plant Viability in Ecuador" »

Understanding Sound Types

Analogue Sound Explained

Analogue sound imitates the vibrations of real sound. Its electrical signal has an analogue curve similar to a real sound wave.

Digital Sound Explained

Digital sound recording does not imitate vibrations but converts them into a binary code, the language computers use.

Digital sound is obtained through a converter. It transforms real sound (analogue) into a computer-readable format.

The Digitization Process

Role of the Converter

A converter is a device that transforms real sound into digital sound. The process is called sampling.

Sound Reproduction

To reproduce sound, the converter follows the inverse process, transforming the digital information back into real sound.

The MIDI System: Digital Communication

... Continue reading "Digital Audio Essentials: Sound, MIDI, and Formats" »