This diagram is useful as a visual prompt for comparing PAN, LAN, MAN, and WAN by geographic scope. It helps preserve the basic idea that these terms classify networks by scale, not by a specific cable, protocol, device, or IP address range.
However, the diagram should not be treated as a strict mathematical definition.
Useful Takeaway
The useful point is that PAN, LAN, MAN, and WAN can be understood as scope-based network categories.
| Category | Typical Scope |
|---|---|
| PAN | Very short personal range |
| LAN | Limited local site |
| MAN | City or metropolitan area |
| WAN | Large geographic area |
For the current LAN note, the durable point is that LAN should be understood as a local-site category, not as a synonym for Ethernet, Wi-Fi, a router, or internet access.
Caution
The diagram represents PAN, LAN, MAN, and WAN as completely disjoint sets. That separation is visually useful, but it can make the classification look more mathematically strict than it is in practice.
In real networking, the boundary between PAN, LAN, MAN, and WAN is not determined by fixed distance alone. Geographic scope, administrative control, network purpose, inter-site connectivity, and the involvement of carrier or external infrastructure all matter.
Therefore, the set-theoretic framing should be used only as a classification aid. It should not be treated as a formal model in which every computer network must always belong to exactly one of PAN, LAN, MAN, or WAN.
Corrected Interpretation
The diagram is best treated as a classification aid, not as an authoritative formal model.
The durable understanding is:
- A LAN is usually a network for one limited local site.
- A WAN usually connects multiple remote sites or broad geographic areas.
- Administrative control matters, but it is not sufficient by itself.
- Physical distance matters, but there is no fixed distance threshold.
- Ethernet, Wi-Fi, MPLS, VPNs, and carrier links are implementation or connectivity technologies, not the definitions of PAN, LAN, MAN, or WAN themselves.
Relation to the LAN Artifact
This source note supports What Is a LAN? by preserving the diagram’s visual comparison while explicitly marking the possible misconception created by its strict disjoint-set framing.