Introduction When designing digital systems, especially for the first time, such as calculators, computers, and communication devices, we often start with complex Boolean expressions that involve several variables and gates. These expressions can be simplified using specific techniques later, allowing the same logical function to be performed using fewer gates Read more…
History The concept of flip-flops dates back to the early days of electronics. The idea behind bistable circuits (flip-flop) dates back to early 20th-century electronics. The first practical bistable multivibrator flip-flop circuit was invented by William Eccles and F. W. Jordan in 1918, and it was called the Eccles–Jordan trigger Read more…
Definition Filters in Tableau allow users to control and refine the data displayed in visualizations. Characteristics Basic Filters help limit the data based on user-defined conditions. Types of Filters There are three main types of basic filters used in Tableau :- Dimension Filters Measure Filters Date Filters Dimension Filters This Read more…
Tableau provides a user-friendly drag-and-drop interface designed for data visualization and analysis. Below is a breakdown of its key components. Tableau’s intuitive UI makes it easy to analyze data using Sheets, Dashboards, and Stories. The Menu, Toolbar, and Data Window help manage data and create impactful visualizations. Understanding data types Read more…
Operators in Tableau are used to perform calculations, comparisons, and logical operations within calculated fields and formulas. These operators help in data transformation, filtering, and decision-making. Types of Operators in Tableau Tableau provides General, Arithmetic, Relational, and Logical operators to create powerful calculations and filters in dashboards. They are categorized Read more…
Types of Built-In Functions Tableau provides several types of built-in functions that are used to manipulate and analyze data in calculated fields. Tableau functions help in data transformation, calculation, and analysis. These functions are categorized into:- Number Functions (Math operations) String Functions (Text manipulation) Date Functions (Date calculations) Logical Functions Read more…
Firewalls are critical for securing Linux systems by controlling incoming and outgoing network traffic based on predefined rules. A firewall is a security system that monitors and controls network traffic. Linux firewalls operate at the kernel level using Netfilter, a packet-filtering framework. Firewalls perform filtering i.e., It blocks or allows Read more…
DNS DNS(Domain Name System) is a hierarchical system used to translate human-readable domain names (e.g., example.com) into their respective machine-readable IP addresses (e.g., 192.0.2.1). In other words, a DNS Server resolves domain names into IP addresses and vice versa. Structure/Components of DNS DNS consists of several components:- Zones and Domains: A Read more…
Partitioning is essential for organizing disk storage in Linux. It allows us to efficiently allocate space for the operating system, swap, data storage, and other purposes. Disk Storage and Devices Storage devices in Linux are represented by device files: HDD/SSD: /dev/sda, /dev/sdb, etc. Partitions: /dev/sda1, /dev/sda2, etc. Storage types in Read more…
Linux permissions are a fundamental aspect of system security and user management. Basic Linux Permissions Linux employs a three-tiered permission system to control access to files and directories. Each file or directory has three main permission types: Permission Types Read (r): This permission allows viewing the contents of a file Read more…