This article compiles a complete set of 30 network‑foundation mind maps, covering everything from the TCP/IP protocol stack and addressing to routing protocols, VLANs, IPv6, and command‑line basics, allowing readers to visually grasp and later recreate core networking concepts.
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 guide explains the Linux ip command—its syntax, how to view and control network interfaces, configure IP addresses, manage routes, set up VLANs, and handle ARP entries—providing practical examples that enable efficient network administration and troubleshooting on Linux systems.
This guide explains how to use the Linux ip command to view and configure network interfaces, manage IP addresses, routes, VLANs, ARP entries, and network aliases, providing practical examples and syntax for effective system networking tasks.
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.
This article explains the differences between Layer 2 and Layer 3 switches, how ARP resolves MAC addresses, the impact of collisions and broadcast domains, and how VLANs and switch port configurations can be used to segment and secure modern Ethernet networks.
This guide explains how to enable VLAN tagging on a Linux server, create VLAN interfaces for different subnets, assign IP addresses, and make the configuration persistent on CentOS/RHEL systems using kernel modules, ip commands, and network‑script files.
This article presents a curated collection of 38 detailed mind maps that systematically cover essential computer network concepts—from transmission media and Ethernet frames to IP addressing, routing protocols, VLANs, and VPNs—helping readers visualize and master the fundamentals efficiently.
This article explains NFV (Network Function Virtualization) concepts and demonstrates how to create virtual network types—VLAN, VPN, vRouter, and vFirewall—using code examples in Python, Java, Go, and C++ for flexible, elastic network deployment.
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.
This comprehensive guide walks you through VLAN fundamentals, including broadcast domain concepts, VLAN creation mechanisms, access and trunk links, static and dynamic VLAN types, inter-VLAN routing with routers and layer‑3 switches, and performance‑boosting techniques, providing a complete roadmap for designing and managing modern LANs.
This comprehensive guide covers core networking concepts—including circuit and packet switching, OSI and TCP/IP models, VLANs, STP, routing protocols like OSPF, and transport and application layer services—providing clear definitions, diagrams, and practical examples for each term.
This article explains how Layer 2 switches forward frames using MAC addresses, how Layer 3 switches add IP routing, the role of ARP in learning MAC addresses, the impact of collisions and broadcast domains, and how VLANs and switch port configurations solve these networking challenges.
This article explains VLAN technology, its IEEE 802.1Q standard, logical network segmentation methods, key benefits such as flexibility, broadcast control and security, and provides a detailed, command‑line configuration example for a medium‑size enterprise network.
This article provides a comprehensive list of 54 H3C campus‑network tutorial videos covering VLAN, STP/RSTP/MSTP, link aggregation, SmartLink, RRPP, VRRP, IRF, multicast, IGMP, AAA, port access control, SSH, SNMP, LLDP, NTP and a full lab, useful for network engineers seeking practical knowledge.
This article compares VLAN and VXLAN, explaining their architectures, benefits, limitations, and suitable scenarios, and helps readers decide which technology best fits their data‑center networking needs.
This guide walks through three practical scenarios for VLAN isolation: using port isolation to separate users within the same VLAN, employing MUX VLAN to achieve selective inter‑VLAN communication and isolation, and applying ACL‑based flow policies to block specific VLANs or individual users while preserving overall connectivity.
This article explains QinQ technology, its encapsulation structure, operation principles, basic and flexible implementations, campus network applications, and provides configuration examples with command‑line snippets for both basic and selective QinQ deployments.
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 how QinQ (IEEE 802.1ad) extends traditional VLANs with a second tag to overcome VLAN scalability limits, detailing its functions, implementation methods, packet format, and a step‑by‑step working example for service provider networks.
This article explains the differences between Layer‑2 and Layer‑3 switches, how ARP resolves MAC addresses, the impact of collisions and broadcast domains, the role of VLANs in segmenting networks, and provides step‑by‑step configuration commands for both switch types.
This visual guide presents a detailed mind map of core networking concepts—including transmission media, Ethernet frames, IP addressing, routing protocols, VLANs, NAT, IPv6, DHCP, and VPN technologies—providing concise illustrations for each topic to aid learners in mastering network fundamentals.
This article explains the differences between layer‑2 and layer‑3 switches, their operating principles, ARP handling, collision and broadcast domains, VLAN concepts, configuration commands, and typical use cases, providing a comprehensive overview for networking fundamentals.
This article explains the operating principles, key differences, and practical applications of Layer 2 and Layer 3 switches, covering MAC‑based forwarding, IP routing, ARP learning, broadcast domains, VLAN segmentation, and step‑by‑step configuration commands for enterprise networks.
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.
During a post‑New‑Year visit home, a communications engineer discovers his family's gigabit broadband is underperforming, diagnoses wiring, ISP bundling, and router issues, and shares a step‑by‑step guide to restore full‑speed wired and Wi‑Fi connectivity while also reviewing 5G coverage and TV streaming options.
This article explains the fundamentals of VLAN, QinQ, and VXLAN, compares their tagging methods, scalability, and use cases, and helps readers understand which virtual LAN technology best fits modern network and cloud environments.
This article, the second part of the “Open vSwitch Full Analysis” series, explains the structure and operation of OVS flow tables, detailing match fields, actions, priorities, timeouts, and provides practical ovs‑ofctl command examples for configuring flows, VLANs, and tunnels such as VXLAN and GRE.
This article demonstrates how to build flat, VLAN, and VXLAN networking topologies using Open vSwitch integrated with Docker containers, covering architecture concepts, required host configurations, step‑by‑step command sequences, and connectivity testing across single‑host and multi‑host environments.
This article explains VLAN fundamentals, why they are needed, how they differ from subnets, the role of VLAN tags and IDs, various interface types, practical deployment scenarios, related protocols, and the challenges VLANs face in modern cloud environments.
This article explains the operating principles, main functions, characteristics, and classifications of Ethernet switches, covering layer‑2 learning and forwarding, layer‑3 routing, layer‑4 load‑balancing, and the technical criteria used to evaluate switch performance.
A college freshman discovered that by repurposing a single Ethernet cable and cleverly wiring it through his dorm room, he could create a broadcast storm that shut down the entire building's network, illustrating the dangers of looped LAN connections and the importance of proper VLAN and STP configuration.
A college student wired a neighbor's Ethernet cable into his dorm room, unintentionally creating a network loop that triggered a broadcast storm across the entire building, and then explored why loops cause storms, how STP mitigates them, and improvised covert switching solutions.
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 clarifies the differences between Layer‑2 and Layer‑3 interfaces, explains VLANIF and PVID concepts, and details how access, trunk, and hybrid ports handle VLANs, providing practical insights for network engineers dealing with Ethernet switching and routing configurations.
This guide walks you through essential Huawei switch commands, covering user and view modes, VLAN creation, port link types, batch operations, initial login procedures, service activation, link aggregation, DHCP setup, and flow‑control configuration, all illustrated with step‑by‑step screenshots.
This article explains the differences in VLAN handling on Huawei switches, detailing the IEEE 802.1Q frame format, the role of PVID, and the specific behaviors of access, trunk, and hybrid port modes, including configuration commands and traffic processing rules.
This article provides a comprehensive overview of network switches, covering their definition, MAC‑based operation, port expansion, classification by manageability and OSI layer, various management methods (Web, CLI, SNMP), product specifications, application scenarios, and key features such as VLAN, port isolation, aggregation, loop detection, ACL, ARP protection, DHCP services, and routing capabilities.
This article explains the definitions and interactions of Trunk, Hybrid, and Access ports, the concepts of VLAN tagging, untagging, and PVID, and demonstrates their behavior on Huawei switches through detailed configuration examples and traffic flow analysis.
This guide details step‑by‑step console commands for setting a management IP address, enabling SSH and Telnet remote login, creating VLANs, assigning ports, and managing VLAN and port groups on a Huawei S5700 switch, including batch operations and web‑based admin account setup.
This guide explains how to configure multiple VLAN‑tagged interfaces on a single Linux network card in CentOS/RHEL, covering kernel module loading, creating VLAN interfaces with ip, assigning IP addresses, and persisting the settings via ifcfg files so they survive reboots.
This guide explains how to set up separate VLANs for technical and sales departments, configure PCs and both layer‑2 and layer‑3 switches, assign IP addresses, and verify inter‑VLAN communication using routing on a layer‑3 switch.
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 offers a comprehensive overview of network switches, detailing their classifications, performance indicators, interface and link methods, virtual LANs, multilayer switching, and product introductions, providing essential knowledge for anyone studying networking fundamentals.
This article provides a comprehensive overview of network switches, covering their basic concepts, classifications, performance indicators, interface and link methods, virtual LANs, multilayer switching, and product introductions, while also including promotional information for related technical e‑books.
This article explains networking fundamentals such as VLANs, single‑arm routing, layer‑3 switches, gateways, DNS, MAC addresses, IP addressing, and subnet masks, using simple analogies and examples to illustrate how devices communicate across different network segments.
A college student recounts turning a single Ethernet cable into a makeshift network switch, unintentionally creating a VLAN broadcast storm that exposed the mechanics of Ethernet loops, STP detection, and the challenges of covertly controlling a dormitory LAN.
This article explains the concept of VLANs, how they segment networks like classroom groups, the role of single‑arm routing and layer‑3 switches for inter‑VLAN communication, and clarifies related fundamentals such as gateways, DNS, MAC addresses, IP addressing, and subnet masks.
This article provides a comprehensive overview of network switches, covering their definition, core functions, port and distance expansion, classification by manageability and OSI layer, various management methods (Web, CLI, SNMP), key features such as VLAN, ACL, routing, and practical deployment scenarios.
Network engineers often go unnoticed until outages, so this guide explains how to make network status transparent through device availability checks, log and traffic monitoring, SNMP error tracking, and automation scripts—leveraging Python, syslog servers, and northbound APIs—to reduce troubleshooting time and prevent incidents.
This article provides a comprehensive overview of Ethernet switching, covering data‑link layer functions, IEEE 802.3 family standards, duplex modes, MAC/IP addressing, auto‑negotiation, flow‑control mechanisms, VLAN concepts, broadcast‑storm mitigation, trunking, and mainframe storage interfaces such as ESCON and FICON.
This guide demonstrates how to enable communication between hosts on different subnets within the same VLAN across two three‑layer switches by configuring VLANs, assigning IP addresses to Vlanif interfaces, and adding static routes on each device.
This article explains the problems of layer‑2 loops and broadcast storms, how VLAN segmentation and spanning‑tree protocols mitigate them, and introduces TRILL technology for scalable data‑center networks, providing detailed concepts, mechanisms, and practical examples for network engineers.
This article explains how office LAN topologies are built with multiple switches, how ARP broadcasts work, why loops occur, and how protocols like STP and VLANs can eliminate loops, reduce broadcast traffic, and improve network security.
This article explains network flooding and broadcast storms caused by loops in Ethernet switches, discusses their impact on data center reliability, and presents mitigation techniques such as VLAN segmentation and spanning‑tree protocols, accompanied by video resources for deeper learning.
This guide explains how to use a Huawei router's transparent bridge and VLAN features to enable communication between selected departments while isolating others, detailing the scenario, configuration logic, and step‑by‑step command sequence for setting up bridge groups and VLAN interfaces.
This article explains why traditional "classic" cloud networking lacks proper layer‑2 isolation, compares flat, VLAN, and overlay designs in OpenStack Neutron, and shows how virtual private clouds (VPCs) offer secure, scalable network segmentation for modern multi‑tenant environments.
This guide demonstrates how to display DHCP pool information, adjust lease durations using interface or global methods, reclaim allocated IP addresses, and configure a management IP address on a layer‑2 switch via VLAN and VLANIF settings, including command‑line examples.
The article details a network connectivity issue between an AR router and a switch, explains how the ARP anti‑attack user‑bind setting blocks AR traffic, and provides step‑by‑step diagnostics and a static binding solution to restore communication.
The article uses the analogy of heavy rain flooding to explain network flooding and broadcast storms, describing how Ethernet switches handle unknown frames, why loops cause endless broadcast traffic, and how VLAN segmentation and spanning‑tree protocols mitigate these issues in modern data‑center architectures.
This article presents a comprehensive guide to wireless network optimization, covering signal strength standards, channel and power planning, VLAN isolation, low‑rate disabling, user rate limiting, probe response control, weak‑signal client blocking, encryption choices, and common troubleshooting scenarios.
This article explains the principles, usage, and data flow of Linux’s abstract network devices—including bridges, 802.1q VLANs, TAP, and VETH—showing how to configure them, analyze traffic, and troubleshoot common issues within virtualized environments.
This article explains how to use ACLs on a Huawei S7706 device to prevent inter‑VLAN communication at Layer 3 by defining separate ACL numbers for each VLAN pair and applying them with traffic‑filter commands on the inbound direction of each VLAN interface.
This guide details how to set up a Cisco 3560G three‑layer switch to support two groups with separate internet exits by defining VLANs, assigning IP addresses, creating ACLs, configuring route‑maps, and applying policy routing to direct traffic through the appropriate upstream routers.
This article explains the concepts and differences of link aggregation, various trunk technologies (ISL, VSAN, VLAN/Ethernet), and Linux bonding modes, describing how they provide bandwidth, redundancy, and load balancing across network switches and servers.
This guide demonstrates how to create VLANs, assign them to interface ranges, configure trunk ports, and set up EtherChannel for redundant parallel connections on Cisco switches using CLI commands.
A college student recounts how a simple Ethernet cable hack caused a network-wide broadcast storm in a dormitory, exploring the underlying VLAN and STP concepts while detailing improvised hardware tricks and the resulting chaos.
This guide provides detailed commands to configure a switch for user access VLANs, set up a firewall as both a layer‑3 and layer‑2 device with VLAN interfaces, DHCP/DNS, security zones, static routing, and NAT to enable internal users to reach external networks.
This guide explains how to load a web package, enable the HTTP server, configure a VLAN interface, resolve an AutoConfig conflict, and set up web login credentials on a Quidway device using CLI commands.
This guide demonstrates how to configure port mode, assign VLANs, set a management IP, add a static default route, disable web and DHCP services, and enable IP‑MAC source binding with static user‑bind entries on a Quidway switch, including verification steps.
This guide walks through creating VLAN 10, assigning an IP address, setting up local AAA users, enabling telnet access, and activating the HTTP server on a Quidway switch, including file management commands and verification steps.
This guide explains how to configure Huawei IPSG on S-series devices by creating user‑bind tables and enabling IP source checking, providing both static and dynamic configuration examples with VLAN, DHCP snooping, and interface settings.
This guide details step‑by‑step how to create VLANs, set up ACLs, define traffic classifiers and behaviors, bind them in a traffic policy, apply the policy to a switch interface, and verify the configuration for enterprise network traffic management.
This guide shows how to configure VLAN batch processing, set up trunk ports on GigabitEthernet interfaces, assign IP addresses to VLAN interfaces, and create advanced ACLs with a flow policy to block matching traffic on a network router.
This guide walks through creating VLANs 2, 20, and 30, configuring VLANIF interfaces with IP addresses, setting up PC access ports, establishing a trunk link to the router, and adding a default static route to complete the router configuration.
