Which method used is based on the device's configuration/group policies. The download is done via the Delivery Optimization component over a mix of standard HTTP calls (TCP port 80) and secure peer-to-peer network calls (TCP port 7680).
Once the list of downloads has been decided, the actual update binary files are then downloaded.
The device decides whether and when to download items from the resulting list.Update metadata is exchanged over these connections and results in a list of updates, apps, drivers, and other updates.A Windows device makes multiple connections to Windows Update services using HTTPS (HTTP over TLS, TCP port 443).When such interactions occur, the Windows Update service running on the device will trigger a series of exchanges over the internet with Microsoft's Windows Update servers. These calls may be made at various times by Microsoft applications and different parts of Windows, such as Microsoft 365 Apps, Microsoft Defender, and Plug and Play (PnP). This system is initiated when a user interacts with the Windows Update settings page or when an application makes a call into the WU client service API. Microsoft 365 Apps updates (Office updates).Updates to the Windows operating system.The Windows Update system distributes a multitude of content. This article provides an overview of the security features of Windows Update. Some protected environments may need to update firewall and proxy rules to ensure that Windows updates can be properly accessed. Its end-to-end protection prevents manipulation of protocol exchanges and ensures only approved content is installed. The Windows Update (WU) system ensures devices are updated securely.
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