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MCA Articles
Page 62 of 95
Types and Uses of Backbone Networks
A backbone network is the central infrastructure component that interconnects multiple networks and provides a high-capacity pathway for data transmission between them. It serves as the primary conduit connecting different local area networks (LANs) within buildings, campuses, or across larger geographical areas to form wide area networks (WANs) or metropolitan area networks (MANs). The backbone network acts as a data superhighway, utilizing various transmission media including optical fiber, copper cables, and wireless technologies such as microwave links and satellite connections. A key characteristic of backbone networks is that their capacity must exceed that of the individual networks they support ...
Read MoreWhat is Vishing (Voice Phishing)?
Vishing (voice phishing) is a type of social engineering attack that uses telephony, typically Voice over IP (VoIP) technology, to deceive victims into revealing sensitive personal or financial information over the phone. Unlike traditional landline services that are tied to physical locations and bill-payers, modern VoIP technologies enable attackers to use caller ID spoofing and automated systems to evade detection. Criminals exploit these technologies to steal credit card numbers, banking credentials, and personal information for identity theft purposes. How Vishing Works Attacker ...
Read MoreWorking and Types of Smart Card
A smart card is a compact microprocessor-based device the size of a credit card that stores and processes data. Smart cards have largely replaced conventional magnetic stripe cards since they can store significantly more data and perform complex functions. Smart cards are now used in various industries, including banking, public transportation, healthcare, and security systems. Smart card manufacturers use advanced technologies such as electron beam lithography to embed small circuits and microprocessors on a printed card. As data storage technology progresses, manufacturers continue to increase the functionality of smart cards by working with nanoscale components. The solid-state design ...
Read MoreWhat is a Wireless Local Loop (WLL)?
A Wireless Local Loop (WLL) is an access system that connects users to the local telephone company's switch using wireless links instead of traditional copper cables. Also known as fixed wireless access (FWA) or fixed radio, this technology provides telephone, facsimile, and data services to business and residential subscribers using analog or digital radio technology. WLL systems enable rapid deployment of basic phone service in areas where geography or telecommunications development makes traditional wireline service prohibitively expensive. They integrate easily with the public switched telephone network (PSTN) and can typically be installed within a month, much faster than traditional ...
Read MoreWhat is E-Governance?
E-governance refers to the application of information and communication technologies (ICT) to government processes and functions to achieve efficient, ethical, accountable, and transparent governance. It encompasses the digital transformation of government services, enabling electronic interactions between government entities and various stakeholders including citizens, businesses, and employees. Through comprehensive multi-stakeholder approaches, e-governance facilitates seamless electronic interactions, streamlining communication between government and non-governmental organizations while improving service delivery to the public. E-Governance Ecosystem Government Digital Services Citizens Business ...
Read MoreXMODEM File Transfer Protocol
XMODEM is a standard file transfer protocol developed by Ward Christensen in 1977. It is a half-duplex communication protocol that sends data in blocks and waits for acknowledgment before transmitting the next block. XMODEM includes effective error detection mechanisms and is widely used in both hardware and software implementations. The protocol organizes file data into packets sent sequentially to the recipient, along with control information that allows the receiver to verify packet integrity. Files are padded with known characters to fill the final block, and file transfer completion is signaled with an end-of-file character. ...
Read MoreWeb Caching and Conditional GET Statements
The activity of saving data for reuse, such as a copy of a web page supplied by a web server, is known as web caching. It is a fundamental technique used to improve web performance and reduce server load. Web caching works by storing frequently accessed content at intermediate locations closer to users. When a user first accesses a page, it is cached or saved, and subsequent requests for the same page are served from the cache rather than the origin server, preventing server overload and improving response times. How Web Caching Works Web caching techniques dramatically ...
Read MoreWhat are Long-Polling, Websockets, Server- Sent Events (SSE) and Comet?
Long-Polling, Websockets, Server-Sent Events (SSE), and Comet are real-time communication techniques that enable persistent connections between client and server. Each method offers different approaches to overcome the limitations of traditional HTTP request-response patterns for real-time applications. Long Polling Long polling is a technique where a client sends an HTTP request to the server and keeps the connection open until the server has data to send back. Instead of immediately responding with empty data, the server holds the request until new information becomes available or a timeout occurs. Long Polling Flow ...
Read MoreWraparound Concept and TCP Sequence Number
The Transmission Control Protocol (TCP) is a reliable, connection-oriented protocol in the transport layer of the OSI model. TCP ensures data integrity and delivery through sequence numbers, acknowledgments, and flow control mechanisms. TCP operates by establishing a connection between source and destination before data transmission. It breaks large data into smaller segments, numbers each byte sequentially, and ensures proper reassembly at the destination. This reliable delivery mechanism makes TCP suitable for applications requiring accurate data transmission. TCP Sequence Numbers TCP uses a 32-bit sequence number field to track data transmission. Each byte in a TCP stream is ...
Read MoreVarious Failures in Distributed Systems
In distributed systems, failure handling is a critical aspect of system design. Unlike centralized systems where failure points are limited, distributed systems face multiple types of failures across different components and locations. Understanding these failure types is essential for building robust, fault-tolerant systems. Distributed systems must handle four primary types of failures that can occur at different levels of the system architecture. Types of Failures in Distributed Systems Transaction Failure Logic errors Site Failure System crash ...
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