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Operating System Articles
Page 165 of 171
What are the types of Hubs in the Computer Network?
A hub is a networking device used to connect multiple devices in a network, creating a single collision domain where all connected devices share the same bandwidth. Hubs operate at the Physical Layer (Layer 1) of the OSI model and simply repeat incoming signals to all connected ports. There are three main types of hubs based on their functionality and features: Passive Hub Passive hubs are the simplest networking devices that contain no electronic components or signal processing capabilities. They act as simple connection points that physically join network cable segments together without amplifying or regenerating signals. ...
Read MoreDistinguish between Connection-Oriented and Connectionless Service
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 MoreWhat is IPv4 Addressing?
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 MoreWhat are the types of IPv4 Addresses?
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 MoreWhat is Multimedia in the Computer Network?
Multimedia in computer networks refers to the integration of multiple forms of content such as text, audio, graphics, animation, and video to create rich communication experiences. It represents one of the most significant challenges and opportunities in modern networking, requiring sophisticated protocols and infrastructure to deliver synchronized content across networks. The term multimedia literally means "multiple media" and involves the simultaneous transmission and presentation of different types of digital content. In networking contexts, multimedia applications include video conferencing, streaming services, interactive media, and real-time communication systems that combine various media elements. Multimedia Elements in ...
Read MoreWhat is the Function of Protocol?
Protocol suites are collections of protocols that act at different layers of the network model to ensure successful communication. Protocols perform various essential functions that enable reliable data transfer across networks. Connection Establishment/Release Data transfer can be either connection-oriented or connectionless. Connection-oriented services establish a reliable communication path before data transfer, making them suitable for large volume transfers. Connectionless services, while faster, are less reliable as they don't establish a dedicated path. Encapsulation A protocol defines how data is encapsulated within frames or packets. Each Protocol Data Unit (PDU) contains control information fields alongside the actual ...
Read MoreWhat is Reverse Address Resolution Protocol (RARP)?
The Reverse Address Resolution Protocol (RARP) is a network protocol described in RFC 903 that performs the opposite function of ARP. While ARP resolves IP addresses to MAC addresses, RARP resolves MAC addresses to IP addresses. This protocol is primarily used by diskless workstations and network devices that know their hardware address but need to discover their IP address during the boot process. How RARP Works RARP uses the same packet format as ARP but operates in reverse. A diskless system reads its hardware address from the network interface card and broadcasts a RARP request asking for its ...
Read MoreWhat is ICMP Protocol?
The Internet Control Message Protocol (ICMP) is a network layer protocol that provides error handling and diagnostic capabilities for IP networks. It serves as a companion protocol to IP, addressing its inherent limitations in error reporting and network management. IP protocol operates as a best-effort delivery service but has two significant deficiencies: Lack of Error Control − No mechanism to report delivery failures or routing problems Lack of Assistance Mechanisms − No way to provide feedback about network conditions IP also lacks mechanisms for host and management queries. Network administrators need to determine if routers ...
Read MoreExplain the Error Reporting Messages in ICMP Protocol
The error-reporting messages in ICMP Protocol are generated when routers or hosts encounter problems while processing IP packets. These messages are sent back to the original source because the only addressing information available in a datagram is the source and destination IP addresses. When network devices detect issues like unreachable destinations, congestion, or header problems, they use ICMP error messages to inform the sender about the specific problem encountered during packet processing. ICMP Error Reporting Messages Destination Unreachable ...
Read MoreWhat is FDDI in the Computer Network?
FDDI stands for Fiber Distributed Data Interface. It is a collection of ANSI and ISO standards for data transmission on fiber-optic lines in a local area network (LAN) that can extend up to 200 km (124 miles). The FDDI protocol is based on the token ring protocol and provides high-speed data transmission at 100 Mbps. FDDI is generally implemented as a dual token-passing ring topology, suitable for campus networks and building backbones. This dual-ring architecture provides fault tolerance, making it ideal for mission-critical network infrastructure. FDDI Architecture FDDI cabling consists of two fiber rings operating in opposite ...
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