How to visualize and map the topology of a local network step by step

With a good graphical representation, you can see all devices, links, and relationships at a glance , quickly locate faults, document the infrastructure, and plan expansions without going in blind. From cloud-based tools like Azure Network Watcher, through professional monitoring solutions and automatic mappers, to free programs for drawing your own diagrams, today you have options for every need.

What is local area network topology and why is it worth visualizing?

Network topology describes how devices (switches, routers, servers, PCs, access points, etc.) are connected and how information flows between them. Visualizing it in a diagram or map transforms something abstract into a clear and manageable image that anyone on the team can understand.

A well-represented topology can be either logical or physical . The logical topology focuses on how traffic is routed, what protocols are used, and how the network is segmented into subnets or VLANs; the physical topology shows where each piece of equipment is located, which cable goes to which port, and which rack or floor each element occupies.

Having an up-to-date network map helps organize and plan networks in both businesses and homes with many devices. It allows you to prepare for expansions, plan migrations, document changes, and justify projects to suppliers and clients without revealing particularly sensitive information.

Furthermore, a clear visualization of the network topology is key to security and regulatory compliance . By understanding all the equipment and links, it becomes much easier to verify adherence to standards (PCI, internal security frameworks, etc.), detect rogue devices, identify critical segments or network weaknesses, and audit the security of your local network.

Another compelling reason is the time saved when troubleshooting . When there's an outage or unusual behavior, the map helps quickly pinpoint where to look: which link might be overloaded, which intermediate switch might be failing, or which specific dependency has broken, and how to fix network faults.

Basic types of network topologies: how they are represented on a map

In any local area network map, you'll find patterns or ways of connecting nodes that repeat themselves because they correspond to classic topologies. Although real-world networks often have a mix of topologies, it's helpful to understand the main models.

The bus topology is one of the simplest: all devices connect to the same medium (the "bus"), which typically has two ends. It requires less cabling and simplifies fault detection. Although less common in modern environments, it remains a fundamental concept that sometimes appears in diagrams of small or segmented networks.

In a ring topology , each node is linked to the next, forming a kind of circle. Data hops from device to device until it reaches its destination. The problem is that if one of the nodes or links fails, the entire network can become unusable, so diagrams usually clearly show the traffic path and where the weak points are.

Star topology is one of the most commonly used in current local area networks. All nodes are connected to a central device (for example, a core switch), which is responsible for distributing traffic. It is robust because the failure of one node does not affect the others, although if the central point fails, the entire segment connected to it will go down.

Finally, mesh topology occurs when there are multiple redundant paths between nodes. It can be total (each node connected to every other node) or partial (only a few extra links to ensure alternative routes). In topology maps, this appears as a very dense network of lines, ideal for critical environments where high availability is paramount.

Network diagrams: logical, physical, and best practices for creating them

When we talk about visualizing local network topology , we're really referring to creating diagrams that represent what's happening "inside" (data flow) and "outside" (cables, racks, buildings, etc.). You'll typically use both approaches in parallel.

A logical network diagram details how information flows: subnets, VLANs, network devices (routers, switches, firewalls), gateways, routing protocols, main routes, etc. It's what you'll use to understand how the network is segmented and how the different parts connect to each other.

A physical network diagram shows the actual layout of the elements: cabling, racks, network outlets, servers, user equipment, access points, etc. It is usually overlaid on floor plans and is very useful when running new cables, moving equipment, or creating custom maps with My Maps.

When creating these diagrams, it is essential to use standardized symbols . Using recognizable icons for routers, switches, servers, workstations, or links makes it much easier for any technician to interpret the map without additional explanations.

It is also key to maintain a clear and organized structure : group similar elements, hierarchize by layers (core, distribution, access), use consistent colors for each type of link or segment, and correctly label each component so that there is no doubt about what each thing is.

Consistent naming is another pillar: short but descriptive names for devices and interfaces, avoiding confusing acronyms or generic labels like "switch1" that mean nothing to anyone when there are dozens of devices.

Finally, diagrams must always be accompanied by documentation and continuous updates . Every relevant change in the network must be reflected on the map; otherwise, in a matter of months they become obsolete (even if they are digital).

Visualize network topology in Azure with Network Watcher

In cloud environments, and especially in Azure , network topology isn't limited to physical switches and routers. It includes virtual networks, subnets, virtual machines, load balancers, managed firewalls, gateways, and more. To avoid confusion, Azure offers topology functionality within Network Watcher.

This tool provides an interactive view of resources and relationships across various subscriptions, regions, and resource groups. It does this through a graphical interface where you can zoom, pan, filter by resource type, and download the map as an .svg file for documentation or sharing.

The topology view is fed by data from Connection Monitor and Traffic Analytics (part of Azure Network Watcher), so you not only see "what is connected to what", but also information about connectivity, traffic flow, potential bottlenecks and network issues, and allows you to consult related traffic and security tools .

Furthermore, from each element you can contextually access diagnostic tools such as connection troubleshooting, packet capture, or next-hop analysis, which greatly simplifies incident resolution.

Azure's topology supports a wide variety of resource types : application gateways, Azure Bastion hosts, DDoS protection plans, public and private DNS zones, Azure Firewall, Azure Front Door profiles, AKS clusters, NAT Gateway, connections, private DNS resolvers, ExpressRoute circuits, load balancers, local network gateways, network interfaces, network security groups, private endpoints, Private Link services, public IP addresses, service endpoints, Traffic Manager, virtual hubs, virtual machine scale sets, virtual machines, virtual network gateways (VPN and ExpressRoute), virtual networks and virtual WANs, as well as WAF policies.

Working with this topology in the Azure portal is quite straightforward: you select the scope (subscriptions, resource groups, locations), choose which types of resources you want to see, adjust the zoom, and explore. You can focus on a specific region, open the Insights tab to see a connectivity and traffic summary, or go to the dedicated Traffic and Connectivity tabs for detailed metrics, provided you have traffic analysis and Connection Monitor enabled.

Azure resource breakdown: from region to virtual machine

One of the great things about Azure's topology is that it doesn't just stay at an abstract global view; you can go down levels until you reach the specific resource you're interested in, for example, a problematic virtual machine.

You start by selecting the subscription scope and regions you want to analyze. In the region view, you see the virtual networks and other resources deployed at that location, as well as virtual network peerings, which helps you understand traffic flow between networks.

Next, you can access the virtual network view . If there are multiple VNETs in the region, a grouped "Virtual Networks" node is displayed first, followed by each VNET with its subnets. From there, expanding a subnet lists all the resources it contains and how they relate to each other.

In the case of a specific subnet, for example “mySubnet” within “myVNet”, you would see virtual machines, network interfaces, and IP configurations . Clicking on the desired VM takes you to a tab with key reports on performance, connectivity, and traffic.

The Traffic tab displays data from Network Watcher flow logs and traffic analysis; the Connectivity tab uses Connection Monitor results to show your configured checks; and the Findings and Diagnostics tab groups tools such as connection troubleshooting, packet capture, and next-hop analysis to investigate problems in depth.

In this way, you go from a high-level view of the region to a very detailed analysis of a single virtual machine without losing context about how it fits into the rest of the topology.

Visualizing AKS cluster topology in Azure (preview)

Azure Kubernetes Service (AKS) clusters add an extra layer of complexity: there are nodes, pods, services, internal and external load balancers, virtual networks, NSG, NAT, public IPs… Without a good visualization, it's easy to get lost.

Network Watcher's topology includes a preview feature that lets you view the AKS network architecture directly in the Azure portal. Essentially, it maps all associated network resources—VNETs, ​​subnets, security groups, load balancers, NAT gateways, public IPs, etc.—and shows how they relate to each other.

This helps to understand the dependencies between nodes, pods, and services , quickly identify connectivity problems (dropped connections, configuration errors, poorly defined routes), and monitor forwarded and dropped traffic within the cluster's routes.

It also allows you to check the status of critical network components at a glance , which is essential if you work with private clusters, Azure Firewall, groups of nodes in separate subnets, or scenarios with dynamic IP allocation for containers.

AKS visualization supports a wide variety of scenarios: predefined clusters with Kubenet, Kubenet with custom VNET and UDR, Azure CNI with or without a dedicated VNET, system- or user-managed NAT Gateway, private clusters, and integrations with Azure firewalls, among others.

As an important limitation, clusters and their associated network must reside in the same subscription and region, and cluster migration between subscriptions, tenants, or resource groups is not supported for this particular view.

Topology maps in automation and monitoring solutions

Beyond Azure, many monitoring platforms already include built-in topology views. These views combine mapping with performance and health metrics, making them ideal for a network operations center (NOC).

In orchestration solutions such as certain automation platforms, the Observability > Topology section typically displays an interactive map that you can customize to view the links, devices, and sites you want. The bottom of the screen usually includes a table with detailed link and device information for precise filtering and navigation.

From these topology pages you can view and manage devices and links : check the status of each site, reorganize the map, inspect link properties, review which equipment is connected to a specific link, or drill down to see specific internal routes (for example, between dynamic routing gateways and other associations).

In some systems, selecting the link between a Dynamic Routing Gateway (DRG) and another resource highlights the specific routing association , allowing you to view its properties, routes, and involved CIDR blocks. This helps you understand precisely how traffic travels through the virtualized network.

In general, these tools allow administrators to monitor the overall state of the network and plan topology changes to avoid performance degradation, leveraging the combination of graphical mapping and real-time monitoring data.

Network topology mapping software: discover and map the infrastructure

Network topology mapping software focuses on discovering devices, understanding how they are interconnected, and automatically representing this on a map. This is what many administrators need when they inherit a network without documentation.

These tools make it easier for IT administrators to understand the overall organization of the infrastructure . By creating clear diagrams, it becomes much simpler to visualize dependencies, identify bottlenecks, and prioritize equipment upgrades or replacements.

In distributed networks, a good mapper even offers geographical views : it displays branches, data centers and WAN links on a world or country map to quickly locate points affected by an incident or generate a customer heat map.

With a complete representation of dependencies, you can identify which device or application might be causing a bottleneck that affects other systems. By seeing how each node depends on the others, you can better prioritize corrective actions.

Among the key functions of the most advanced automatic mappers are the discovery of layer 2 devices (using CDP, LLDP, ARP, forwarding tables, IP routes…), the detection of servers, virtual machines, firewalls and storage systems, as well as the ability to map virtual infrastructures such as VMware, Hyper-V, Xen or Nutanix.

These solutions also typically allow you to see specific relationships such as hosts to VMs, hosts to networks, hosts to datastores, VMs to networks, or VMs to datastores, which is perfect for understanding how the physical and virtual layers connect.

Practical tools for creating and visualizing local network topology maps

If you want to get down to business and start drawing the topology of your local network, there is a good range of programs, many free or with limited versions at no cost, that cover different levels of complexity.

Network Notepad is a classic Windows tool with numerous network icons (routers, switches, servers, PCs, printers, access points, etc.). It allows you to visually design diagrams by dragging and connecting elements. It offers a free version and a paid professional version with more features, such as full Windows 11 support, multi-page diagrams, enhanced graphics, new custom shapes, grouping and locking of elements, and rotation of objects and text.

Lucidchart stands out for its polished interface and for producing visually appealing diagrams. It operates in the cloud, supports real-time collaboration, and offers templates designed for both home and professional local networks. The free version allows you to edit a few documents and access hundreds of templates; paid plans expand the number of documents, templates, and integration options.

Netpict is ideal if you're looking for something simple. It offers a set of basic network icons (router, switch, server, cloud, Wi-Fi, etc.) and a very intuitive workspace. Simply drag icons from the sidebar to the canvas and draw the connections. It's a perfect option for users who want a simple and clear diagram without getting lost in dozens of menus.

NetProbe goes a step further because, in addition to letting you draw diagrams, it can scan IP ranges and discover devices to help you build a map based on the reality of your network. The free version is sufficient for relatively simple networks, although it may fall short for large infrastructures with multiple VLANs and segmentation.

Miro is an online collaborative canvas designed for remote teams. With it, you can design network diagrams and many other types of schematics, leveraging AI to automatically generate ERD or UML diagrams and integrations like PlantUML or Mermaid, which convert code into diagrams. It includes built-in video calls, over 130 connectable applications, and top-tier security certifications.

DiagramDesigner is a lightweight, easy-to-use, open-source program designed for creating diagrams in general (not just network diagrams). Its interface is somewhat dated, but it allows you to design basic network maps without complications and is compatible with recent versions of Windows, including Windows 11.

LANFlow focuses on network mapping and offers vector-based 2D and 3D graphics, allowing you to scale up or down without loss of quality. It has a good collection of icons geared towards professional environments and is very convenient for representing dozens of devices in a single diagram. A trial version and paid licenses are available.

InterMapper , available for Windows, Linux, and macOS, combines mapping and monitoring. It not only maps the network but also displays the status of each device in real time . It allows you to group devices into "summary groups" to isolate sections of the network and facilitate management. It offers a 30-day free trial, ideal for evaluating whether it meets your monitoring and control needs.

EdrawMax is a cross-platform software (Windows, macOS, Linux, Android, iOS) that allows you to create over 300 types of diagrams, including network diagrams. It's vector-based and comes with updated symbol libraries for Google Cloud Platform, Cisco, AWS, and Azure, as well as a good selection of templates. It has a free version with limitations and several paid plans.

Packet Tracer , developed by Cisco, is geared towards learning about networks. It realistically simulates the behavior of routers, switches, and other Cisco devices, allowing you to create complex network scenarios and see how traffic is routed in real time. It's perfect if you're studying or want to test configurations before implementing them in production.

draw.io (diagrams.net) is a very popular free web tool for creating diagrams of all kinds, especially network diagrams. It works in the browser and also has a desktop version, offering real-time collaboration, templates, network-specific icons, and export to formats such as PNG, PDF, or SVG. For many people, it's the natural replacement for Visio when they're looking for something free and accessible from any device.

Topology maps in WhatsUp Gold and integrated inventory solutions

WhatsUp Gold is a monitoring solution that incorporates powerful Layer 2 and 3 network discovery to create comprehensive topology maps. It represents routers, switches, VLANs, physical and virtual servers, and workstations, correlating Layer 3 IP addresses with Layer 2 links to provide an integrated view of connectivity.

Its map is highly customizable: you can hide or show elements and links, use radial, hierarchical or custom views , drag and drop devices to organize the scheme and display attributes and status directly next to each device's icon.

Total Network Inventory (TNI) is another interesting tool that combines mapping with inventory and monitoring. It scans the network, detects devices, collects hardware and software data, and lets you drag and drop it onto the canvas to build a detailed map.

Once you have the map in TNI, you can customize it with annotations and images , organize groups, and take advantage of real-time monitoring to see the status of devices directly from the diagram. This all-in-one approach greatly simplifies daily administration and the rapid resolution of incidents.

In essence, both WhatsUp Gold and TNI pursue the same goal: to have a live network map , synchronized with reality, that serves as a reference for the entire technical team.

Having these kinds of tools and good documentation habits makes a huge difference in any environment: it allows you to truly understand how your local network is set up, avoid unpleasant surprises when something goes down, and, above all, have the peace of mind that when it's time to expand, migrate, or solve a problem, you won't be working blindly but with a clear topology in front of you.