The provided AutoSupport endpoints (https://support.netapp.com/...) explicitly use the HTTPS protocol, as indicated by the "https://" prefix. NetApp AutoSupport transmits diagnostic and system health data to NetApp Support over a secure web connection. This requires outbound connectivity on TCP port 443, the standard port for HTTPS traffic. Therefore, to enable AutoSupport in a firewalled environment, a routing and firewall policy must be created to specifically allow outbound HTTPS traffic from the Cloud Volumes ONTAP instance to the specified NetApp endpoints.

B. routing and firewall policy to allow NFS/SMB traffic: NFS and SMB are client-facing file access protocols and are not used for sending AutoSupport telemetry to NetApp.

C. routing and firewall policy to allow SSH/RDP traffic: SSH and RDP are protocols for remote administrative access and are not used for the automated transport of AutoSupport messages.

D. routing and firewall policy to allow DNS traffic: While DNS is required to resolve the endpoint's hostname to an IP address, it is insufficient by itself. The actual data transfer occurs over HTTPS.

1. NetApp Cloud Manager Documentation, "Networking requirements for Cloud Volumes ONTAP": In the section detailing outbound internet access requirements from a Cloud Volumes ONTAP system, the documentation specifies that for AutoSupport functionality, traffic to support.netapp.com must be allowed using the HTTPS protocol over TCP port 443.

Source: NetApp BlueXP documentation, "Networking requirements for Cloud Volumes ONTAP", Table: "Outbound internet access from Cloud Volumes ONTAP".

2. NetApp Knowledge Base, Article 1010079, "What are the firewall requirements for AutoSupport?": This article confirms that AutoSupport messages can be sent using HTTP or HTTPS. For secure transport, which is standard for cloud environments and indicated by the URLs in the question, HTTPS (TCP/443) is the required protocol.

Source: NetApp Knowledge Base, Article ID: 1010079, Section: "Description".