Physical topology shows what is connected to what: where devices sit and which cables, ports, and links join them. Logical topology shows how devices communicate and how data moves between them, whatever the cabling looks like. The two views answer different questions, and a single network can have one physical arrangement and a quite different logical structure.
Physical topology: what is actually connected
Physical topology describes the real arrangement of hardware. Cisco defines it through actual connections and the placement of components, and its explainer lists cables, ports, racks, servers, endpoints, and other hardware as the things a physical view covers. Cisco
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A physical diagram is the one to open when you need to trace a cable, identify a port, check where a device lives in a rack, or work through a suspected layer-1 fault. Cisco Networking Academy training material hosted by Universitas Sriwijaya gives the detail a physical diagram is expected to carry: device type and model, operating system version, cable type and identifier, cable specification, connector type, and the endpoints of each cable. That material is course content rather than a current product specification, so use it for the general list of fields, not for the exact fields any particular vendor’s tooling requires. Cisco Networking Academy course material
Logical topology: how devices communicate and traffic flows
Logical topology describes communication relationships and the paths data follows. It is about behavior, not placement. AWS describes the logical side of network topology as the way data is routed and exchanged between nodes, and notes that in cloud environments virtual networks have logical topologies that are independent of the physical infrastructure beneath them. AWS
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A logical diagram typically carries information that a cable map cannot:
- device identifiers and the communication relationships between them
- IP addresses, prefix lengths, and interface identifiers
- subnets and network segments
- routes and the routing and data-link protocols in use
- WAN technologies, site-to-site VPNs, and other virtual connections
- the direction and path traffic takes toward a destination
Use a logical diagram when the question is how two endpoints reach each other, which segment a host belongs to, or where a route sends traffic. Microsoft describes logical diagrams in the same terms, covering communication, subnets, routing, and segments.
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Why the two views can disagree
Physical proximity does not reveal logical membership. Two servers in the same rack can sit on different subnets, and two machines on opposite sides of a building can share one segment. The physical layout tells you how signals travel over copper or fiber; the logical layout tells you which devices are allowed to talk directly and which must pass through a router or firewall.
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Consider an Ethernet LAN cabled in a star: every endpoint runs to a central switch. The physical diagram shows that star with the switch at the center. The logical diagram may show several subnets, a router between them, and a VLAN or firewall policy that decides which endpoints can reach which. Neither drawing is wrong, but reading one as the other leads to bad conclusions. A reader who sees the star might assume all endpoints share one broadcast domain, and a reader who sees the subnet map might assume a failed cable is impossible to locate from it.
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The physical layer still matters for the logical one. Cisco notes that logical designs depend on a physical underlay with enough capacity and scalability to carry them, so a clean logical plan can still fail when the cabling or hardware beneath it cannot support the traffic. Cisco
What each diagram should show
| Physical diagram | Logical diagram |
|---|---|
| Device location and type | Device identifiers and communication relationships |
| Cables, cable identifiers, and cable specifications | IP addresses, prefix lengths, and interfaces |
| Ports, connectors, racks, servers, and hardware | Subnets, segments, routes, and routing protocols |
| Cable endpoints and physical links | VPNs, virtual connections, protocols, and traffic flow |
The table reflects the field lists in the cited training material and the Microsoft guidance. It is a checklist for scoping each diagram, not a rule that every diagram must include every field.
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Common topology patterns and their trade-offs
Bus, ring, star, tree, mesh, and hybrid describe structural patterns that can be drawn in either view. Labels such as “star” do not by themselves tell you whether a drawing shows actual cabling or communication paths; check the diagram’s title and legend. AWS describes point-to-point as well, and its general tendencies for several patterns are below. These are tendencies, not guarantees, because real behavior depends on implementation and redundancy.
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|---|---|---|
| Bus | Simple to build; vulnerable to failure of its central bus; congestion grows as devices are added | Failure of the shared backbone affects every attached device |
| Star | Easier to isolate a single endpoint or cable fault | Depends on the central switch or hub |
| Mesh | Fault tolerant | Harder to configure and expand |
| Point-to-point | Described as a basic pattern; no further behavior stated in the cited source | Not stated in the cited source |
| Ring, tree, hybrid | Not stated in the cited source | Not stated in the cited source |
When you compare actual topology choices for a design, work through five questions: what happens if a link, node, or central device fails; where capacity limits or bottlenecks would appear; how easily capacity, users, sites, or segments can grow; what equipment, cabling, maintenance, and expansion cost; and what access, segmentation, and resilience the workload requires. Cisco recommends weighing purpose, scale, budget, performance, redundancy, and scalability together. Cisco
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How to build each diagram
Start by deciding which question the diagram must answer. Then build it in this order:
- Decide whether the reader needs hardware placement, communication behavior, or both.
- List the devices and services that matter for that question.
- Arrange the physical components or logical relationships in a layout that reads easily.
- Add connections, and label each line with what it represents: a cable, a routed path, a VPN, or a logical relationship.
- Add the relevant detail. On a physical view, that means cable identifiers and endpoints. On a logical view, it means addresses, prefix lengths, segments, and routes.
- Check that connections and labels are correct. If the drawing becomes too dense, split it into focused views rather than cramming both kinds of detail into one.
Microsoft’s workflow follows the same logic: list the components, arrange the diagram, add connections, label the shapes, and format the result. It says network diagrams support troubleshooting, planning, expansion, and security and compliance work. Microsoft
Which view to open first
Microsoft’s Microsoft 365 team puts the choice simply: “Both types of network diagrams have their place, and you’ll probably use both.” The guidance is written for business network documentation, so treat it as general practice rather than a standard. Microsoft
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- A device has no link light or a cable looks damaged: start with the physical diagram to find the cable, its endpoints, and the port it uses.
- Two hosts cannot reach each other: start with the logical diagram to check subnets, prefix lengths, routes, and whether a firewall or VPN sits between them.
- You are planning expansion: use both. The logical plan shows the segments you need; the physical plan shows whether the cabling and hardware can carry them.
- You are documenting a cloud or virtual network: the logical view is the primary artifact, because the physical hardware is largely abstracted away from the design, as AWS describes.
The vendor explainers cited here, from Cisco and AWS, do not show a publication date in the pages used for this article, and the Microsoft page does not show one either. Treat their wording as general networking guidance rather than version-specific behavior for any particular product.
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