This article explains VLAN concepts, using classroom analogies, then details single‑arm routing, layer‑3 switches, gateways, DNS, MAC addresses, and subnet masks, illustrating how network segmentation improves efficiency and how devices communicate across different broadcast domains.
This article explains what a MAC address is, its structure and role in networking, and why many embedded devices must assign their own MAC addresses due to cost, industry practices, and the need for on‑demand configuration rather than universal uniqueness.
This article explains the fundamentals of VLANs, single‑arm routing, layer‑3 switches, gateways, DNS, MAC addresses, and subnet masks, using clear analogies and examples to show how network segmentation and routing enable efficient communication within and between local networks.
The article recounts a real‑world incident where a device’s MAC address could not be changed because a previous engineer deliberately disabled the relevant function, discusses the discovery of the backdoor code, and examines the legal and ethical implications of such intentional vulnerabilities.
Learn how to view and interpret IP addresses on Windows and Linux using commands like ipconfig, ifconfig, and ip addr, understand the differences between ifconfig and ip addr, explore IPv4 classes, CIDR notation, public vs private IPs, and MAC addresses, and network interface flags.
This article explains the fundamentals of virtual LANs, how single‑arm routing and layer‑3 switches enable inter‑VLAN communication, the role of gateways, DNS, MAC addresses, and subnet masks, using clear analogies to help beginners grasp essential networking concepts.
This article explains VLAN fundamentals, how single‑arm routing and layer‑3 switches enable inter‑VLAN communication, the role of gateways, DNS resolution, MAC addresses, and subnet masks, using clear analogies and diagrams to help readers grasp essential networking concepts.
The article explains why MAC addresses are essential by tracing the history and design of the Internet, comparing network protocols to languages, describing the shift from star to mesh topologies for resilience, and showing how TCP/IP relies on underlying layers like Ethernet to function.
This article explains the concept of VLANs, how they segment broadcast domains like classroom groups, describes single‑arm routing and layer‑3 switches for inter‑VLAN communication, and covers essential networking components such as gateways, DNS, MAC addresses, IP addressing, and subnet masks, illustrating each with clear analogies.
This article explains the concept of VLANs, illustrates their purpose with real‑world analogies, and details how single‑arm routing, layer‑3 switches, gateways, DNS, MAC addresses, and subnet masks work together to segment and connect networks efficiently.
This article explains the concepts of VLANs, single‑arm routing and layer‑3 switches, gateways, DNS, MAC addresses, and subnet masks, using simple analogies and diagrams to show how network segmentation and communication work together in modern LAN environments.
This article explains the concept of VLANs, illustrates how they segment networks like classroom groups, describes single‑arm routing and layer‑3 switches for inter‑VLAN communication, and covers related fundamentals such as gateways, DNS, MAC addresses, and subnet masks, providing clear analogies and diagrams for beginners.
This article explains how computers communicate over networks by introducing MAC addresses, the role of hubs and switches, the function of routers, IP addressing, subnet masks, ARP, and routing tables, illustrating the process of data transmission across different network layers.
This article explains the purposes of MAC and IP addresses, how they are structured, their role in network communication, and why MAC addresses can be duplicated across different LANs while IP addresses remain unique within a network.
This guide shows how to use shell commands and simple Bash scripts on CentOS 7 to list active network interfaces, extract their IPv4/IPv6 addresses, display MAC addresses, and check link speed using ip, awk, ethtool, and other standard utilities.
This article provides a clear, step‑by‑step explanation of network layering, covering the purpose and function of each layer—from the physical medium up to the application protocols—while illustrating concepts with diagrams and practical examples.
This article explains the structure and purpose of MAC addresses, details Ethernet II frame fields, describes how switches learn and forward frames, and explores VLAN tagging, configuration methods, and practical lab setups for Access, Trunk, and Hybrid ports.
This article explains how computers use MAC and IP addresses, subnet masks, ARP, hubs, switches, and routers to communicate across physical, data‑link, and network layers, illustrating the learning process with step‑by‑step examples and tables of address mappings.
This article explains how to view a machine's IP address on Windows and Linux, describes the structure and classification of IPv4 addresses, introduces CIDR subnetting, distinguishes public and private IP ranges, and clarifies the role and format of MAC addresses.
This guide explains how to configure a router to block selected LAN hosts from accessing the Internet by applying source‑MAC‑address based ACLs while still permitting those hosts to reach the gateway, using VLAN, traffic classifiers, and traffic policies.
This article explains the 48‑bit MAC address format, IEEE allocation rules, address block sizes, how to modify MAC addresses on Linux and macOS, and the role of MAC addresses in Ethernet frames, ARP, and LAN communication, highlighting practical considerations and limitations.
This article explains the structure, allocation, and practical use of MAC addresses, why global uniqueness is unnecessary, how to modify them on Linux and macOS, and how they function within LAN communication, including ARP and switch behavior.
Learn how to create a practical employee smart‑check‑in tool with just 12 lines of Python code by capturing mobile MAC addresses via a USB Wi‑Fi adapter, using scapy and pandas on Ubuntu, and automatically logging attendance without expensive hardware.
This guide explains how to view and interpret IP addresses on Windows and Linux, compares net‑tools with iproute2, clarifies IPv4 classful addressing versus CIDR, distinguishes public and private IP ranges, and details MAC addresses and network device flags for reliable networking.
This article explains the basic concepts of network switches, including data link layer functions, MAC address structure, unicast and multicast addressing, Ethernet II frame composition, common switch models, and the forwarding principles illustrated with diagrams.
This article explains, in plain language, how the five‑layer OSI model enables two distant computers to discover each other, establish a connection, and reliably exchange data by detailing the roles of the physical, data‑link, network, transport, and application layers.
