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Page 11 of 88
Explain the Orthogonal Frequency Division Multiplexing in Computer Network.
Orthogonal Frequency Division Multiplexing (OFDM) is an advanced frequency division multiplexing technique that transmits multiple data streams simultaneously over a single transmission medium by using closely spaced, mathematically orthogonal subcarriers. Unlike traditional FDM, OFDM allows subcarriers to overlap without interference because they are orthogonal to each other. This orthogonality means the subcarriers are mathematically perpendicular, enabling efficient spectrum utilization while maintaining signal integrity. How OFDM Works OFDM divides the available spectrum into numerous narrowband subcarriers, each modulated with a portion of the data stream. The orthogonality ensures that peak power of one subcarrier occurs at the null ...
Read MoreWhat is Parallel Transmission in Computer Network?
Parallel transmission is a method of data communication where multiple data bits are transmitted simultaneously over separate communication channels or wires. Unlike serial transmission, where bits are sent one after another in sequence, parallel transmission sends several bits at the same time, significantly increasing data transfer speed. In parallel transmission systems, each bit of data travels on its own dedicated wire or channel. For example, to transmit an 8-bit byte, eight separate wires are used − one for each bit. This allows all eight bits to be transmitted concurrently rather than sequentially. Parallel Transmission ...
Read MoreWhat is an IMAP Protocol in the Computer Network?
IMAP (Internet Message Access Protocol) is a standard protocol that allows users to access and manage email messages stored on a remote mail server. Unlike protocols that download messages locally, IMAP enables users to view, organize, and manage their emails directly on the server while maintaining synchronization across multiple devices. IMAP operates at the application layer of the networking model and uses port 143 for standard connections (or port 993 for secure IMAPS connections). This protocol is essential for modern email access, especially for users who need to check emails from multiple devices like smartphones, tablets, and computers. ...
Read MoreWhat is CIFS in the Computer Network?
CIFS (Common Internet File System) is a network protocol that enables file and printer sharing over a network. It is also known as Server Message Block (SMB) and is commonly used for sharing documents and resources on Local Area Networks (LANs). The protocol allows users to access and manipulate files on remote servers as if they were stored locally. Users can perform standard file operations such as read, write, create, delete, and rename on files located on network servers. CIFS Protocol Operation Client ...
Read MoreWhat is DIMM in the Computer Network?
DIMM represents the Dual In-Line Memory Module and is a circuit board that manages memory chips in computer systems. It utilizes a 64-bit bus to transfer data to memory, whereas a single in-line memory module (SIMM) only has a 32-bit path. This allows DIMMs to transfer more information at once, making them significantly more efficient. DIMM contains a series of memory known as dynamic random access memory (DRAM), which serves as primary storage - the main memory that directly reads and executes saved instructions or information to the CPU. DIMMs are widely used in modern computers, servers, and workstations ...
Read MoreWhat is NAS in the Computer Network?
NAS stands for Network Attached Storage. It is a dedicated storage device connected to a network that provides file access services to multiple computer systems. NAS devices consist of storage drives and a specialized engine that implements file services, using protocols like NFS (Network File System) or CIFS (Common Internet File System). NAS systems are popular with enterprises and small organizations across many industries as effective, scalable, and cost-efficient storage solutions. They support applications like email systems, accounting databases, payroll processing, video recording and editing, and data logging operations. Network Attached Storage (NAS) Architecture ...
Read MoreWhat is NFS in the Computer Network?
Network File System (NFS) is a distributed file system protocol that allows users to access files and directories located on remote servers as if they were stored locally. Developed by Sun Microsystems in 1984, NFS enables seamless file sharing across networks using a client-server architecture. NFS operates over IP-based networks and is widely supported by Unix-like operating systems including Linux, Solaris, FreeBSD, AIX, and macOS. The protocol allows multiple clients to simultaneously access shared files and directories stored on NFS servers, providing transparent remote file access. NFS Client-Server Architecture ...
Read MoreWhat is NVMe in the Computer Network?
Non-Volatile Memory Express (NVMe) is a high-performance storage access and transport protocol specifically designed for solid-state drives (SSDs) and flash storage. It delivers significantly higher throughput and faster response times compared to traditional storage interfaces like SATA and SAS. NVMe is optimized for modern flash storage, providing a direct communication path between SSDs and host systems through the PCIe (Peripheral Component Interconnect Express) bus. This eliminates the bottleneck that occurs when high-speed flash storage is connected through legacy interfaces originally designed for slower hard disk drives. NVMe vs Traditional Storage Communication ...
Read MoreWhat is Storage Area Network (SAN) in Computer Network?
SAN stands for Storage Area Network. This is a dedicated high-speed network that connects storage devices to multiple servers, providing a shared pool of storage resources. Each server can access SAN storage as if it were directly attached local storage, enabling centralized data management and improved storage utilization. A SAN consists of interconnected hosts, switches, and storage devices that communicate using specialized protocols. Fibre Channel (FC) is the most common transport protocol, offering high-speed, low-latency connections. Fibre Channel over Ethernet (FCoE) allows organizations to run FC traffic over existing Ethernet infrastructure, converging storage and IP networks. ...
Read MoreDifferentiate between DAS and SAN in Computer Network.
Direct Attached Storage (DAS) and Storage Area Network (SAN) are two distinct storage architectures used in computer networks. Understanding their differences is crucial for selecting the appropriate storage solution based on organizational needs and budget considerations. Direct Attached Storage (DAS) DAS stands for Direct-attached storage. It is computer storage that is connected directly to one computer and not accessible to other systems on the network. The DAS system is attached directly to the computer through the HBA (Host Bus Adapter). Unlike network-attached storage devices, DAS connects directly to the server without requiring network infrastructure. Modern DAS systems ...
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