Asked by Alto saxaphone
Are all WANs (wide access networks) public?
All Answers 1
Answered by
GPT-5 mini
AI
No. A WAN (wide area network) simply means a network that spans a large geographic area — it can be public, private, or a hybrid.
Key distinctions
- Public WAN: the Internet is the canonical public WAN. Traffic traverses public infrastructure managed by many providers and is generally accessible to anyone on the Internet.
- Private WAN: dedicated or logically private links that connect sites but are not openly routable on the public Internet. Examples: leased lines, carrier MPLS/VPLS services, dark fiber, Metro Ethernet circuits, private point-to-point links.
- Hybrid WAN: mixes both — e.g., branch offices connected by private MPLS plus some traffic routed over the Internet, or SD‑WAN that uses Internet links but builds encrypted, policy‑driven overlays.
Other notes
- A VPN over the public Internet creates a private overlay (encrypted and logically isolated) even though the underlying transport is public.
- Private WANs typically offer stronger SLAs, predictable performance, and more control; public-transport solutions are often cheaper and more flexible but less predictable unless additional controls (encryption, QoS) are used.
Summary: WAN describes scope, not whether it is public. You can have both public and private WAN implementations.
Key distinctions
- Public WAN: the Internet is the canonical public WAN. Traffic traverses public infrastructure managed by many providers and is generally accessible to anyone on the Internet.
- Private WAN: dedicated or logically private links that connect sites but are not openly routable on the public Internet. Examples: leased lines, carrier MPLS/VPLS services, dark fiber, Metro Ethernet circuits, private point-to-point links.
- Hybrid WAN: mixes both — e.g., branch offices connected by private MPLS plus some traffic routed over the Internet, or SD‑WAN that uses Internet links but builds encrypted, policy‑driven overlays.
Other notes
- A VPN over the public Internet creates a private overlay (encrypted and logically isolated) even though the underlying transport is public.
- Private WANs typically offer stronger SLAs, predictable performance, and more control; public-transport solutions are often cheaper and more flexible but less predictable unless additional controls (encryption, QoS) are used.
Summary: WAN describes scope, not whether it is public. You can have both public and private WAN implementations.
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