A: there is no interval option
The signatures are auto updated on an hourly basis and do not require regular check for the availability of the most recent update. Once you enable Signature Auto Update, then the NetScaler appliance connects to the server hosting the signatures to check if a newer version is available.
A. The update interval must be set because the system needs to know how frequently to check for and download updates. If the interval is zero, auto-updates are effectively turned off.
B. Internet connectivity is essential for the device to reach out to the signature update servers to download the latest signature files.
Additionally, while DNS resolution is generally required for internet connectivity and to resolve the addresses of the update servers, it is not explicitly stated as a condition in the context provided. Also, the state of the syslog file, while important for logging, does not directly affect the signature update process. However, it is always good practice to ensure that system logs are monitored and managed to prevent them from filling up, which could potentially disrupt various system functions.
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