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| Servizi Differenziati (DiffServ)× | Open Shortest Path First (OSPF)× | Software-Defined Networking (SDN)× | |
|---|---|---|---|
| Campo | Telecomunicazioni | Telecomunicazioni | Telecomunicazioni |
| Famiglia | Process / pipeline | Process / pipeline | Process / pipeline |
| Anno di origine≠ | 1998 | 1998 | 2008 |
| Ideatore≠ | IETF DiffServ Working Group | John Moy | Nick McKeown et al. |
| Tipo≠ | QoS architecture | link-state routing protocol | programmable network paradigm |
| Fonte seminale≠ | Blake, S., Black, D., Carlson, M., et al. (1998). An Architecture for Differentiated Services. RFC 2475. link ↗ | Moy, J. T. (1998). OSPF Version 2. RFC 2328. link ↗ | McKeown, N., Anderson, T., Balakrishnan, H., et al. (2008). OpenFlow: enabling innovation in campus networks. ACM SIGCOMM Computer Communication Review, 38(2), 69-74. DOI ↗ |
| Alias | quality of service, QoS architecture | link-state routing, intra-domain routing | network virtualization, programmable networks |
| Correlati≠ | 3 | 2 | 4 |
| Sintesi≠ | DiffServ is a QoS architecture providing scalable, class-based service differentiation in networks. Introduced by IETF (1998), DiffServ marks packets with a Differentiated Services Code Point (DSCP) in the IP header, enabling routers to apply per-hop-behaviors (PHBs) based on markings. Unlike IntServ (which reserves resources per-flow), DiffServ is stateless and scalable to Internet scale. DiffServ remains the primary QoS mechanism in ISP and enterprise networks. | OSPF is a link-state interior gateway protocol (IGP) for routing within an autonomous system. Introduced by John Moy in 1998, OSPF converges faster than distance-vector protocols and supports equal-cost multipath (ECMP). It remains widely deployed in enterprise and ISP networks for intra-domain routing, though IS-IS is increasingly preferred in large backbones. | Software-Defined Networking (SDN) is a network architecture paradigm that decouples the control plane (routing decisions) from the data plane (packet forwarding). Introduced by McKeown et al. (2008) with OpenFlow, SDN enables network programmability by centralizing control logic in software-based controllers that direct forwarding behavior of simple programmable switches. SDN has transformed network operations, enabling rapid service deployment, traffic engineering, and cloud integration. It is now foundational in data centers and service provider networks. |
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