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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteIn Internet networking, best-effort service is the basic IP delivery model: the network tries to forward packets, but does not promise a particular delivery time, bandwidth, loss rate or end-to-end performance level. Results can change as traffic load changes. “Best effort” describes the service offered, not a guarantee that every packet will arrive or that performance will suit every application.
What best-effort service means
IP networks forward packets using the resources and policies available at the time. There is no per-packet promise of a reserved resource or a specific outcome under the general best-effort model. RFC 2990 describes the Internet’s default offering as “a best-effort variable service response” and explains that the response varies with the load from active traffic flows: RFC 2990, Next Steps for the IP QoS Architecture.
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RFC 1633 describes basic IP best-effort delivery as the Internet’s fundamental service model. For elastic applications—those that can make use of available capacity without requiring a fixed response—it calls the model “as-soon-as-possible” (ASAP) service. Its proposed Integrated Services architecture was intended to extend, not replace, that baseline: RFC 1633, Integrated Services in the Internet Architecture: An Overview.
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“Best effort” therefore does not mean that the network makes no effort. It means the service model itself does not promise a particular result. Actual delay, throughput and packet loss may vary with network conditions; the phrase alone does not establish a provider’s contractual terms or describe every network’s implementation.
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What best effort does not guarantee
The term by itself makes no specific promise about any of these outcomes:
- Delivery: a forwarding attempt is not a guarantee that every packet will arrive.
- Latency: there is no fixed delivery time promised by the general model.
- Bandwidth or throughput: no particular rate is reserved or assured by the term alone.
- Packet loss: the model does not specify a guaranteed loss rate.
- End-to-end performance: an endpoint cannot infer a particular result across an unknown path just from the phrase “best effort.”
Best effort versus QoS
Quality of service (QoS) mechanisms can distinguish traffic and provide a selected, potentially more predictable service response. The label “QoS,” however, does not by itself establish a guarantee: the specific service definition, deployed mechanisms and network policies determine what is offered. More controlled service also requires mechanisms to manage traffic and the load admitted to the network, as RFC 2990 explains.
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| Question | Best-effort baseline | Differentiated or QoS service |
|---|---|---|
| How does response behave? | Variable; it can change with offered load, as described in RFC 2990. | May provide a selected superior or more predictable response; the particular service defines what that means (RFC 2990). |
| How are resources treated? | The general model provides no per-flow service commitment. RFC 5290’s narrower term “simple best-effort traffic” refers to traffic that does not rely on differential treatment or admission control. | Uses mechanisms that distinguish traffic and may require load or admission control (RFC 2990). |
| What is guaranteed? | No specific latency, throughput, loss rate or delivery result follows from “best effort” alone. | Any guarantee depends on the service definition and implementation; the QoS label alone is not a promise. |
| Can an endpoint know what treatment it will get? | Not across an unknown path based on the term alone. | Not from a marking or label alone; behavior depends on the network’s deployed mechanisms and policies (RFC 7657). |
Does best effort mean all traffic is treated equally?
No. It is too broad to equate “best effort” with equal treatment or a guaranteed fair share. RFC 5290 defines the qualified term “simple best-effort traffic” for traffic that does not rely on differential treatment along the path and does not use admission control. It presents rough fairness in flow rates as a useful resource-allocation goal, not a universal guarantee: RFC 5290, Comments on the Usefulness of Simple Best-Effort Traffic.
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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →That qualification matters: RFC 5290’s wording is scoped to “simple best-effort traffic,” not every use of “best effort” in every network. A particular network may have policies or mechanisms that affect how traffic is handled.
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Do packet markings guarantee QoS?
No. A marking on a packet does not let its sender assume that every network along the route will honor it or provide a particular forwarding behavior. RFC 7657 notes that a network may not offer a marked service and may handle the marking differently: RFC 7657, Differentiated Services (Diffserv) and Real-Time Communication.
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