Information Technology
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BIOS stands for Basic Input/Output System. It is firmware stored on a chip on the motherboard that initializes hardware components and loads the operating system. BIOS interfaces are text-based, and users access them by pressing keys like DEL, F2, or ESC during system startup. BIOS uses Legacy Boot, has limited drive support (up to 2.2…
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Modern wireless networks operate using evolving Wi-Fi standards, each offering different speed, range, and frequency capabilities. These standards, managed by the IEEE under the 802.11 umbrella, are critical to understand for any technician tasked with configuring or troubleshooting wireless networks. 802.11n, released in 2009, was the first to support dual-band operation—using both 2.4 GHz and…
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The duplexing assembly is a specialized component in many modern printers that enables automatic double-sided printing—also known as duplex printing. Rather than requiring the user to manually flip pages to print on the other side, the duplexer takes over that function, flipping the sheet internally and refeeding it through the print path for the second…
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Older laptop models that use CCFL (Cold Cathode Fluorescent Lamp) backlighting rely on a display inverter to power the screen’s illumination. The inverter’s job is to convert the laptop’s DC power into AC voltage needed by the CCFL tube inside the display panel. Without a functioning inverter, the screen may be technically on but will…
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The /sbin directory in Linux holds system administration commands, which are mostly used by the root user or users with administrative privileges. Commands in /sbin help control and manage core parts of the system such as filesystems, networking, and startup processes. Tools like fsck (file system check), ifconfig (network configuration), and reboot are typically located…
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Trusted Platform Module (TPM) is a dedicated chip embedded on a computer’s motherboard, designed to secure hardware through integrated cryptographic keys. It stores sensitive information such as encryption keys, digital certificates, and passwords in a tamper-resistant environment. TPM is commonly used for: BitLocker drive encryption Secure Boot validation Windows Hello biometric authentication Digital Rights Management…
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Using FTP, File Transfers are fun; I can use tcp/20 or /21! With port 22, I’m feeling well; Secure communication in my little Shell. Telnet’s the same, but more easy to see; nobody likes you when you’re port 23. SMTP is where Simple Mail thrives; it’s Transferred to servers with port 25. With DNS, I…
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What Is an SSD? A Solid-State Drive (SSD) uses flash memory chips to store data. There are no moving parts, making it faster, quieter, and more durable than traditional hard drives. SSDs have extremely fast read/write speeds, especially in NVMe (PCIe) form, which are ideal for boot drives, gaming systems, and business apps. SSDs come…
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A thermal printer uses heat to transfer images onto paper. It comes in two types: No ink or ribbon needed. Uses heat-sensitive paper that blackens when heated. Common in receipts and shipping labels. Uses a heated ribbon to transfer wax or resin onto media. Durable prints ideal for barcode labels and inventory tags. Consumables and…
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Two of the most recognized and widely used printer languages in the industry are PCL (Printer Command Language) and PostScript. Each one comes with unique advantages and is suited for different types of environments and workloads. PCL, developed by Hewlett-Packard, is a standard language found in many office printers. It’s built for speed and efficiency—great…
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Every desktop computer relies on a Power Supply Unit (PSU) to convert wall electricity into usable voltage levels that safely power internal components. The PSU takes in AC (Alternating Current) and outputs DC (Direct Current) in multiple voltages—typically +12V, +5V, and +3.3V—distributed to the motherboard, CPU, storage devices, and GPU. Without proper power regulation, even…
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Liquid Crystal Display (LCD) monitors use liquid crystals and a backlight to create images on screen. Each pixel is composed of subpixels (red, green, and blue) controlled by liquid crystal alignment, which either blocks or passes light from the backlight. There are two key types of LCD panel technologies: Fast response times Lower cost Narrower…
