Whether predefined applications can be modified or deleted

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Predefined applications cannot be modified or deleted. You can obtain the latest predefined applications by periodically updating the application signature database.

Other related questions:
Whether the undo add address command can delete preset IP addresses in predefined regions
The undo add address command cannot delete preset IP addresses in predefined regions. To override a preset IP address in a predefined region, add this IP address to another region if you know the region of the IP address or add the address to the region named "unknown-zone" if you do not know the region of the IP address.

Whether the bearer protocols of a predefined application used as a match condition and referenced by a policy shall also be referenced by the policy
Yes. If a predefined application is referenced in a policy as a match condition and the predefined application has a bearer protocol, the bearer protocol must also be referenced in the policy. For example, BT is referenced in a policy as a match condition, the policy must also reference its bearer protocol HTTP. For application and bearer protocol information, see http://sec.huawei.com. When you download the SA signature database, you can download the signature database description file to understand the relationship between the application and bearer protocol.

Whether the UUID of a LUN can be deleted
Can the UUID of a LUN be deleted? No. A UUID is a unique identifier of a LUN. Deleting the UUID will cause a drive letter shift.

Whether hardware configuration can be modified for servers
Server components that are in the compatibility list support hardware upgrade and configuration modification.

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