Dears I was going thru the INE vol 1 . ver 5 labs, and also went thru other workbooks, it is using .PKG files . PKG files are also called signature files ,then what is this .SDF.
Here is the reference link : https://www.cisco.com/en/US/docs/ios/sec_data_plane/configuration/guide/sec_cfg_ips_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1154863
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