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Articles by sudhir sharma
Page 9 of 98
Cracking the Code: Understanding the LLC Protocol Data Unit
The Logical Link Control (LLC) Protocol Data Unit (PDU) is a critical component in the IEEE 802 reference model that operates at the upper portion of the data link layer. It manages flow control, error detection, and synchronization between network devices, ensuring reliable data transmission across different network technologies. LLC serves as an interface between network layer protocols (such as IP) and the Media Access Control (MAC) sublayer, providing a standardized way to handle data communication regardless of the underlying physical network technology. Purpose and Definition of LLC PDU The LLC PDU encapsulates data received from upper-layer ...
Read MoreBeware of the Bug: Navigating the World of Malicious
In today's digital age, the threat of malware (malicious software) is more prevalent than ever. Malware comes in various forms such as viruses, worms, and ransomware — each designed to compromise computer systems or steal sensitive data. As cybercriminals continue to develop sophisticated techniques for deploying these threats, it's crucial that both novice and professional users stay informed about the different types of malware and their potential impacts on our digital lives. Common Types of Malware Virus Infects files Trojan ...
Read MoreDecoding MAN: Understanding its Role in Computer Networking
A Metropolitan Area Network (MAN) is a computer network that connects multiple Local Area Networks (LANs) within a specific geographical region, typically spanning a city or metropolitan area. MANs serve as the crucial link between smaller LANs and larger Wide Area Networks (WANs), covering distances ranging from 5 to 50 kilometers. MANs play a critical role in modern communication infrastructure by enabling organizations with multiple locations across a city to share resources, data, and services efficiently. Examples include university campuses connecting multiple buildings, city-wide cable TV networks, and corporate networks linking branch offices within a metropolitan area. ...
Read MoreDigital Footprint Management: Leaving Your Mark Without Leaving a Trace
In today's digital age, our online presence is more important than ever. Your digital footprint – the trail of data you leave behind as you navigate the internet – has become an essential aspect of your personal and professional life. From job hunting to maintaining relationships, having a positive and secure digital footprint can be a game-changer. However, managing this vital aspect of your online identity requires consistent effort and attention to detail. This article discusses the importance of managing your digital footprint, provides practical tips on enhancing your online reputation while protecting your privacy, and helps you ...
Read MoreBreaking the Noise Barrier: Maximum Data Rates for Noisy and Noiseless Channels
The maximum data rate or channel capacity determines how much information can be transmitted through a communication channel without errors. Understanding the fundamental limits imposed by both noiseless and noisy channel conditions is essential for designing efficient communication systems. Two key theorems define these limits: the Nyquist theorem for noiseless channels and Shannon's theorem for noisy channels. Both provide mathematical foundations for calculating maximum achievable data rates under different conditions. Maximum Data Rate for Noiseless Channels In a noiseless channel, the maximum data rate is limited only by the bandwidth and the number of discrete signal levels ...
Read MoreAdvanced JavaScript Backend Basics
JavaScript is a lightweight, interpreted programming language primarily used for web development. Each browser has its own JavaScript engine that enables proper code execution. Common browsers and their JavaScript engines include: SpiderMonkey for Firefox V8 for Google Chrome JavaScriptCore for Safari Chakra for Microsoft Internet Explorer/Edge To standardize JavaScript across browsers, the ECMA (European Computer Manufacturers Association) sets official standards for the language. How JavaScript Engine Works JavaScript engines execute code in two distinct phases to ensure proper functionality across all browsers: ...
Read MoreAsynchronous Functions and the Node Event Loop in Javascript
Asynchronous functions allow programs to continue executing without waiting for time-consuming operations to complete. This non-blocking behavior is fundamental to JavaScript and Node.js, enabling better user experience and efficient resource utilization. When executing expensive operations like network requests or file I/O, asynchronous functions prevent the entire program from freezing. Instead of blocking execution, these operations run in the background while other code continues to execute. Understanding Asynchronous Execution In synchronous programming, each operation must complete before the next one begins. Asynchronous programming allows multiple operations to run concurrently, with callbacks or promises handling completion. console.log('One'); ...
Read MoreThe Ultimate Guide to Mastering Ping in C Programming: Basics, Commands, and Troubleshooting
In C programming, implementing a ping utility involves creating ICMP (Internet Control Message Protocol) echo request packets and analyzing the responses. Ping is a fundamental network diagnostic tool that helps test connectivity, measure latency, and troubleshoot network issues. Syntax #include #include #include int socket(int domain, int type, int protocol); int sendto(int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen); How Ping Works Ping operates by sending ICMP echo request packets to a ...
Read Morefopen() for existing file in write mode in C
The fopen() function in C is used to open files for various operations. When opening an existing file in write mode, it's important to understand how different modes affect the file's content. Syntax FILE *fopen(const char *filename, const char *mode); fopen() for an Existing File in Write Mode When using fopen() with write mode on an existing file − 'w' mode: Creates a new file if it doesn't exist, or truncates (empties) an existing file before writing 'w+' mode: Same as 'w' but allows both reading and writing 'a' mode: Appends new ...
Read MoreBitwise recursive addition of two integers in C
In this problem, we are given two numbers. Our task is to create a C program for the bitwise recursive addition of two integers. The logic to find the sum using bitwise operations is similar to manual addition we learned in school. For finding the sum, we add each digit and if a carry is generated, we add it to the next digit position. We will use the XOR operator to find the sum and the AND operation to check for carry. If there is a carry, we recursively add it back to the result. This is the ...
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