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MCA Articles
Page 64 of 95
What is Advanced Peer-to-Peer Networking (APPN)?
A Peer-to-Peer (P2P) network is a distributed computing model where tasks and workloads are shared among interconnected nodes called peers. Unlike traditional client-server architectures, all participants have equal capabilities and responsibilities for data processing and sharing. Advanced Peer-to-Peer Networking (APPN) is a sophisticated networking protocol developed by IBM as part of their Systems Network Architecture (SNA). APPN enables computers to communicate directly with each other without relying on a central server or controlling hardware, providing enhanced flexibility and fault tolerance. APPN Network Architecture Node A ...
Read MoreDifference between RIP and OSPF
The Routing Information Protocol (RIP) and Open Shortest Path First (OSPF) are two fundamental routing protocols used in computer networks, but they operate on entirely different principles and are suited for different network environments. Routing Information Protocol (RIP) RIP is one of the oldest distance-vector routing protocols that uses hop count as its primary routing metric. It determines the best path to a destination based solely on the number of routers (hops) a packet must traverse. Maximum hop limit − RIP permits a maximum of 15 hops, which limits the size of networks that can ...
Read MoreWhat is Multiple Spanning Tree Protocol (MSTP)?
Multiple Spanning Tree Protocol (MSTP) is an advanced Ethernet switching protocol that enables efficient loop prevention across multiple Virtual LANs (VLANs) simultaneously. Unlike traditional STP which creates one spanning tree for all VLANs, MSTP allows different VLANs to use separate spanning tree instances for optimal path utilization. MSTP uses Bridge Protocol Data Units (BPDUs) to communicate tree topology information between switches. It prevents loops by creating a loop-free topology while allowing different VLANs to take different paths through the network, maximizing link utilization and providing load balancing capabilities. MSTP - Multiple Spanning Trees ...
Read MoreWhat is a Shielded Twisted Pair (STP) cable?
A Shielded Twisted Pair (STP) cable is a type of network cable that includes two independent wires wrapped in a protective foil or braided metal shielding. Originally developed by IBM for token ring networks, STP cables prevent electromagnetic interference and enable faster, more reliable data transmission. The key distinguishing feature of STP cables is their additional protective layer that surrounds the twisted wire pairs, providing superior electromagnetic interference (EMI) protection compared to unshielded twisted pair (UTP) cables. STP Cable Structure Outer Jacket ...
Read MoreWhat is AAA (Authentication, Authorization, and Accounting)?
Authentication, Authorization, and Accounting (AAA) is a comprehensive security framework that controls access to computer resources, enforces policies, and tracks user activities. This three-step process ensures that only authorized users can access network resources while maintaining detailed logs of their activities. AAA is commonly implemented with network protocols like RADIUS (Remote Authentication Dial-In User Service) and is typically deployed as a dedicated server to centrally manage network security policies across an organization. AAA Framework Process Flow Authentication Who are you? Authorization ...
Read MoreDynamic Domain Name System (DDNS) in Application Layer
The Dynamic Domain Name System (DDNS) is a protocol that provides DNS extensions allowing DNS servers to accept requests to dynamically add, update, and delete entries in the DNS database. Unlike traditional DNS, DDNS automatically updates DNS records when IP addresses change, making it essential for networks with dynamic IP addressing. Dynamic DNS was created to address the problem of frequent IP changes. When an ISP assigns dynamic IP addresses from a pool, the same domain may receive different IP addresses over time. DDNS automatically refreshes the DNS database to maintain accurate domain-to-IP mappings. How DDNS Works ...
Read MoreWhat is Digital Service Unit (DSU)?
A Digital Service Unit (DSU) is a hardware device that connects a Local Area Network (LAN) to an external digital communication carrier service. The DSU works in conjunction with a Channel Service Unit (CSU) to provide the interface between customer premises equipment and the telecommunications provider's digital network. The DSU serves as a critical component in WAN connectivity, converting digital signals between different formats and providing necessary timing and control functions for reliable data transmission over long distances. How DSU Works A DSU typically features multiple ports including a WAN port (connecting to the digital circuit) and ...
Read MoreWhat is Winternitz One Time Signature Scheme?
The Winternitz One-Time Signature (W-OTS) scheme is a quantum-resistant digital signature algorithm proposed by Robert Winternitz. It is considered post-quantum secure because it relies on the security of cryptographic hash functions rather than mathematical problems that quantum computers can solve efficiently. W-OTS uses a parameter W to determine the trade-off between signature size and computation time. The most common implementation uses W = 256, which provides a good balance between security and efficiency. Winternitz One-Time Signature Scheme Private Key 32 random values ...
Read MoreWhat is the difference between SSH and SFTP?
Let us begin by understanding the fundamental concepts and differences between SSH and SFTP. SSH (Secure Shell) SSH (Secure Shell) is a cryptographic network protocol that enables secure communication between two computers over an insecure network, including the internet. It provides encrypted remote login and command execution capabilities, replacing insecure protocols like Telnet, rlogin, and rsh. SSH was developed by SSH Communications Security Ltd to establish secure connections with remote devices. It supports strong authentication methods and encrypted data transmission using public-key cryptography, making it the standard for secure remote administration. SSH ...
Read MoreWhat is IrDA (Infrared Data Association)?
IrDA represents the Infrared Data Association, a universal consortium of hardware and software manufacturers that creates and supports interoperable solutions for infrared (IR) data networking for computer networks, connections, and different networking applications. Infrared communication uses a transceiver (a set of transmitters and receivers) in both devices that connect. Specialized microchips support this functionality, and several devices may require specific software for synchronized communication. An example is the special provision for IR in Microsoft's Windows 95 operating system. In the IrDA-1.1 standard, the maximum data frame size is 2048 bytes and the maximum transmission rate is 4 Mbps. ...
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