Network Topology Basics for Beginners: 7 Types, Examples and Mapping Tools (2026)

Quick answer: Network topology is the layout of a network: how devices (nodes) are connected and how data travels between them. The seven classic types are point-to-point, bus, ring, star, tree, mesh and hybrid. Almost every modern office LAN is a star (or a hierarchy of stars) built around switches, Wi-Fi access points extend that star wirelessly, and data centers use a spine-and-leaf design. You can document your own topology for free with draw.io or map it automatically with tools such as Auvik, Domotz or SolarWinds Network Topology Mapper.

Key Takeaways

• Topology has two views: physical (cables and hardware) and logical (how data flows).
• Star is the default for wired LANs because one failed cable affects only one device.
• Mesh gives the most redundancy and costs the most; it is used in backbones, data centers and mesh Wi-Fi.
• Bus and ring are mostly legacy concepts today, but still appear in exams and industrial networks.
• Most real networks are hybrid: stars at the edge, redundant links in the core.

Understanding Network Topology

Definition

Cisco defines network topology as the way to “describe the physical and logical structure of a network. It maps the way different nodes on a network, including switches and routers, are placed and interconnected, as well as how data flows.” Put simply, topology is the shape of your network.

Importance

Topology decides what happens when something breaks, how easily you can add devices, where traffic bottlenecks form and how much cabling and hardware you need. Knowing your topology is also the first step to troubleshooting: you cannot trace a fault through a network you cannot picture.

Types

Topology comes in two views. The physical topology is the actual cabling and placement of devices. The logical topology is how data flows between devices, which can differ from the wiring. For example, a set of devices plugged into one switch (a physical star) can be split into separate VLANs that cannot talk to each other (different logical networks). Our guide to physical vs logical network diagrams shows how to draw each.

Types of Network Topology

IBM lists seven common topologies: point-to-point, bus, ring, star, tree, mesh and hybrid. Here is how they compare.

Topology	How it connects	Strengths	Weaknesses	Where you see it today
Point-to-point	A direct link between two nodes	Simple, dedicated bandwidth	Only two endpoints	Site-to-site links, WAN circuits, a PC to a printer
Bus	All devices share one cable	Cheap, little cabling	One break can take down the segment; slows as devices are added	Legacy Ethernet, some industrial systems
Ring	Each device connects to two neighbors in a loop	Predictable traffic; dual rings add resilience	A single break disrupts a single ring; harder to change	Metro fiber rings, some industrial networks
Star	Every device connects to a central switch	Easy to add devices and isolate faults	The central switch is a single point of failure	Almost every office LAN; Wi-Fi around an access point
Tree	Stars connected in a hierarchy	Scales across floors and buildings	Upper-level links are critical	Campus networks (access, distribution, core)
Mesh	Nodes link to several or all other nodes	Multiple paths, high redundancy	Expensive and complex to cable and manage	WAN backbones, data centers, mesh Wi-Fi
Hybrid	A mix of the above	Fits real-world needs	More to document	Most business networks

Bus

In a bus topology, every device taps into a single backbone cable, and data sent by one device travels along the cable to all others. Bus networks are simple and need little cabling, but they are hard to scale. Their big weakness is that a single cable fault can take down the whole segment, which is why modern Ethernet moved to switches.

Ring

In a ring, each device connects to exactly two others, forming a loop. Data passes around the ring until it reaches its destination. Dual counter-rotating rings add a backup path, which is why ring designs persist in some fiber and industrial networks.

Star

In a star, every device has its own cable to a central switch. If one cable fails, only that device drops off, and adding a device means adding one cable. The trade-off is that the switch is a single point of failure, which larger networks solve with redundant switches and uplinks.

Tree

A tree is a hierarchy of stars: access switches connect to distribution switches, which connect to a core. IBM describes it as combining elements of bus and star networks to create a hierarchical structure. This is the classic three-tier campus design (access, distribution, core) that Cisco documents.

Mesh

In a mesh, devices connect to several (partial mesh) or all (full mesh) other devices, so traffic has multiple paths and survives link failures. Cisco describes data center spine-and-leaf networks as having every leaf switch connected to every spine switch in a full-mesh arrangement.

Hybrid and point-to-point

A hybrid topology combines two or more of the types above, for example star-wired offices joined by a meshed WAN. Point-to-point is the simplest topology of all: one dedicated link between two nodes, common for connecting two sites.

Which Network Topology Is Best?

There is no single best topology; it depends on size, budget and how much downtime you can accept.

• Small office or home: star. One switch, one router, one or two access points.
• Multi-floor or campus network: tree (hierarchical star) with redundant uplinks.
• Data center: spine-and-leaf, for predictable latency between servers.
• Networks where uptime is critical: partial mesh in the core and WAN.

What Is the Most Used Network Topology?

Star, in its extended or hierarchical form. Switched Ethernet LANs connect each device to a switch port, and those switches are in turn connected in a hierarchy, so nearly every office network you walk into is a star or a tree of stars. The CompTIA Network+ exam objectives (N10-009) reflect this: they cover star/hub-and-spoke, mesh, hybrid, spine-and-leaf, point-to-point and the three-tier model, and no longer list bus or ring.

What Topology Does Wi-Fi Use?

A standard Wi-Fi network is a star: laptops and phones connect wirelessly to an access point, and the access point connects by cable to the wired network. Mesh Wi-Fi systems add wireless links between access points, so the access points form a mesh even though each client still connects to one access point at a time.

Factors to Consider When Choosing Network Topology

Scalability

Star and tree designs scale by adding switch ports and switches. Bus and ring get harder to extend as they grow.

Cost

More links cost more. A full mesh needs a connection between every pair of nodes, so its cabling grows much faster than a star’s as you add devices.

Performance

Shared media (bus) slow down as devices are added; switched stars give each device its own link; spine-and-leaf keeps server-to-server hops predictable.

Redundancy

Ask what happens if any single cable or device fails. Mesh and dual-uplink trees survive; a single star switch or a single bus cable does not.

Security

Topology affects where you can place firewalls and how easily you can segment traffic. Hierarchical designs give natural points (the distribution and core layers) to enforce segmentation.

Summary

For most businesses the answer is a hierarchical star at the edge with redundancy in the core. Spend on redundancy where an outage would hurt most.

How Do You Map Your Network Topology?

Once you understand the types, the next step is documenting your own network. You can draw it by hand or let software discover and draw it. Prices below are vendor-published, checked September 2026.

Tool	Approach	Price	Good for
draw.io	Draw by hand	Free, open source	Beginners and small networks; Cisco and network shape sets included
Lucidchart	Draw by hand, collaborative	Free plan (3 documents); Individual $9 per month, Team $10 per user per month, billed annually	Teams sharing diagrams
Microsoft Visio	Draw by hand	Plan 1 $5, Plan 2 $15 per user per month, paid yearly	Microsoft 365 organizations
Nmap / Zenmap	Discover devices	Free, open source	Finding what is on the network before you draw it
Domotz	Automatic topology mapping and monitoring	$35 per site per month, unlimited devices; 14-day trial	Small businesses and MSPs
Auvik	Live automatic mapping (SaaS)	Quote, based on devices; 14-day trial	IT teams whose network changes often
SolarWinds Network Topology Mapper	Scheduled discovery, Layer 2 and 3 maps	From $1,977, perpetual; 14-day trial	Exporting maps to Visio for documentation
Paessler PRTG	Monitoring with maps	Free up to 100 sensors; paid from $200 per month paid annually	Monitoring and mapping together

Cisco Packet Tracer, available free through Cisco Networking Academy, is also popular for practicing topologies before building them. For a deeper look at monitoring tools, see our PRTG pricing guide, SolarWinds alternatives, SNMP monitoring tools and the network monitoring software category.

How to Choose a Network Mapping Tool

1. Learning or one small office: draw.io plus Nmap costs nothing.
2. Diagrams keep going out of date: choose automatic mapping (Auvik, Domotz, NTM).
3. You also need alerts when things break: pick a monitoring tool with maps, such as PRTG or Domotz, so one product covers both.

Conclusion

Network topology is simply the shape of your network. Learn the seven types, recognize that your office is almost certainly a star or tree of stars, and put redundancy where failures would hurt most. Then document what you have, starting with a free drawing tool and moving to automatic mapping as the network grows.

FAQs