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A computer network is a collection of interconnected computing devices that can exchange data and share resources with each other. These networked devices use standardized rules called communication protocols to transmit information over physical or wireless connections. Computer networks enable distributed processing where tasks are divided among multiple computers rather than being handled by a single machine. This collaborative approach allows organizations to achieve greater efficiency, resource sharing, and scalability across different locations. Basic Computer Network Structure Client Client ... Read More
In computer networks, services can be classified based on how they handle data transmission between devices. The two primary approaches are connection-oriented and connectionless services, each with distinct characteristics and use cases. Connection-Oriented Services In a connection-oriented service, a dedicated communication path is established between the sender and receiver before data transmission begins. Each packet follows the same predetermined route, known as a virtual circuit, ensuring reliable and ordered delivery. The service operates in three phases: connection establishment, data transfer, and connection termination. This approach guarantees that packets arrive in the correct order without duplication or loss. ... Read More
The Spanning Tree Protocol (STP) is a network protocol that prevents switching loops in Ethernet networks by creating a loop-free logical topology. STP convergence is the process by which switches in a network calculate the optimal path and block redundant links to maintain network stability. When network topology changes occur, STP convergence ensures that the network quickly adapts while preventing broadcast storms and forwarding loops that could disrupt communication. Understanding STP Convergence STP convergence involves three critical processes: root bridge election, port role determination, and port state transitions. During convergence, all switches in the network must agree ... Read More
Electronic mail, commonly known as Email, is a method of exchanging digital messages over computer networks. Understanding the difference between email as a technology and specific email services like Gmail is essential for anyone using digital communication. What is Email? Email stands for Electronic Mail and refers to the transmission of messages over the internet using standardized protocols. Email operates using multiple protocols within the TCP/IP suite: SMTP (Simple Mail Transfer Protocol) − Used to send messages POP3 or IMAP − Used to retrieve messages from mail servers Configuration requirements − ... Read More
A recent study conducted by KPMG found that even though 94% of businesses consider cybercrime to be their primary security concern, 72% of those same businesses have been the target of a cyberattack in the previous year, and 78% still don't have a cyber-incident response plan in place. According to Steve Langan, Chief Executive Officer of Hiscox Insurance, cybercrime "cost the global economy over $450 billion in 2016, more than two billion personal records were stolen, and in the United States alone, more than 100 million Americans had their medical records stolen." Even Consumers WannaCry When hackers target ... Read More
A Virtual-Circuit Network is a category of packet switching network where a virtual path is established between the source and destination systems for data communication. This path appears to the user as if it is a dedicated physical path, but is actually a logical circuit allocated from a managed pool of circuit resources based on traffic requirements. The network resources forming parts of this path can be shared by other communications, however this sharing is not visible to the user. Virtual-Circuit Network Path Source ... Read More
The Stop and Wait Protocol is a fundamental flow control mechanism in data communication where the sender transmits one data packet at a time and waits for an acknowledgment (ACK) from the receiver before sending the next packet. This simple approach ensures reliable data transmission but comes with significant performance limitations. This protocol operates on a request-response basis, making it suitable for applications where data integrity is more critical than speed. However, network issues like packet loss, delayed acknowledgments, and propagation delays can severely impact its efficiency. Stop and Wait Protocol Operation ... Read More
An IPv4 address is a unique 32-bit identifier used to distinguish devices on a network. IPv4 (Internet Protocol version 4) operates at the network layer and assigns logical addresses to every interface that needs to communicate using TCP/IP. These addresses consist of 32 bits represented in binary notation, but to make them human-readable, they are typically expressed in dotted decimal notation. This format uses four decimal numbers (0-255) separated by periods, where each number represents 8 bits (one octet). IPv4 Address Structure (32 bits) ... Read More
ISDN (Integrated Services Digital Network) is a circuit-switched network technology that provides end-to-end digital connectivity over traditional telephone infrastructure. It bridges the Central Office's local loop and customer premises by using digital switching and transmission techniques to deliver voice, data, video, and fax services over a single line. The term "Integrated Services" refers to ISDN's capability to simultaneously deliver multiple types of communication services—data, voice, video, and fax—over a single digital connection. Multiple devices can be connected to the line and used as needed, making it a versatile solution for both residential and business applications. ISDN Services ... Read More
IPv4 supports various types of addressing modes to enable different communication patterns across networks. Understanding these addressing types is crucial for network design and implementation. Unicast Addressing A unicast address is assigned to a single network interface located on a specific subnet and facilitates one-to-one communication. This is a unique address worldwide for the identification of a machine on the network. Subnet prefix − The network identifier or network address portion of an IP unicast address. All nodes on the corresponding physical or logical subnet must share the same subnet prefix, which must be unique ... Read More