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Module 1: Introduction to Cybersecurity
Cybersecurity is the ongoing effort to protect individuals, organizations and governments from digital attacks by protecting networked systems and data from unauthorized use or harm. Personal data is any information that can be used to identify you, and it can...
Using Android Debug Bridge (ADB) to remotely send commands to an Android device
Android Debug Bridge (adb) is a versatile command-line tool that lets you communicate with a device. The adb command facilitates a variety of device actions, such as installing and debugging apps. adb provides access to a Unix shell that you can use to run a v...
Slow sorting on an SSD folder with a lot mixed media
Problem You want to make the sorting process faster (as it somehow was before) on a folder that contains a huge amount of folder and files. Solution We have to fix the folder optimization to treat this H:\Descargas folder in the example as a standard ...
Gestión del dominio
Nominalia + Dynu [2022]
Dynu + Cloudflare [2023]
Transferencia del dominio a Dynu
A finales de 2023, antes de que venciese el año y se renovase automáticamente el dominio en Nominalia, lo transferí a Dynu ya que el precio era la mitad de lo que costaría la renovación en Nominalia. Como ya tenía la gestión del DDNS en Dynu, de esta forma cen...
Cloudflare: Introducción y setup
¿Cómo funciona Cloudflare? Básicamente, Cloudflare es una vasta red de servidores que puede mejorar la seguridad, el rendimiento y la fiabilidad de cualquier recurso conectado a Internet. Para ello, Cloudflare funciona como un proxy inverso para tu tráfico ...
Configuración de Cloudflare
Email Routing Ocultar mi email con Cloudflare Email Routing me permite crear un alias personalizado (como el que aparece en la pagina de bienvenida de la wiki: inquiries@sergio-jimenez.net) que reenvie correos a mi cuenta real, protegiendo mi dirección princi...
Actualización de los registros DNS de Cloudflare via API
Introducción Dado que los nameservers han pasado de Dynu a Cloudflare, se necesita un script similar al que se usa para la parte DDNS de Dynu. API de Cloudflare La API de Cloudflare permite actualizar registros DNS con una simple llamada. Aquí lo que se b...
GNS3
Setting up GNS3
0. Introduction to GNS3 and its documentation
Introduction GNS3 is used by hundreds of thousands of network engineers worldwide to emulate, configure, test and troubleshoot virtual and real networks. GNS3 allows you to run a small topology consisting of only a few devices on your laptop, to those that ha...
1. Comparison of emulators
Dynamips This is the "grandfather" of network emulation. It specifically emulates the hardware of older MIPS-based Cisco routers (like the 2600, 3600, or 7200 series). It runs the actual Cisco IOS binary files. Dynamips is the technology leveraged by GNS3 sin...
2. GNS3 GUI installation on Windows / GNS3 VM installation on VMware Workstation
Download Link The official download link for the lastest stable release as of 10 May 2026: https://www.gns3.com/software/download This downloads the file GNS3-2.2.59-all-in-one-regular.exe GNS3 GUI and VM Setup On the installer, at the Choose Component...
3. Creating a Project and GUI Tuning
Projects and Resources After configuring the GNS3 VM, we can finally launch the GNS3 GUI and start a new project, which I will name "CCNA Security" (I will use it on the CCNA Security Labs). At the right section "Servers Summary", we can see both the GNS3 ...
Labs
Lab 1-1: Cisco Secure ACS 5.8.1 - Introduction and VMware Installation
Introduction ACS is a policy-based security server that provides standards-compliant Authentication, Authorization, and Accounting (AAA) services to your network. ACS facilitates the administrative management of Cisco and non-Cisco devices and applications. ...
Lab 1-2: Cisco Secure ACS 5.8.1 - Licensing
Introduction After succesfully installing the ACS on a VMware VM and accessing the GUI, we are prompted to enter a license, otherwirse the product cannot be used: Obtaning an Evaluation License from cisco.com Go to Cisco Software Central and then access...