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: Specifies a "Universal" execution image containing all Cisco IOS feature sets (IP Base, Data, Security, and UC). The k9 suffix indicates standard strong cryptographic payloads (such as Triple DES and AES) are included.
: Refers to Cisco IOS version 15.8(3)M7 , a maintenance release focused on stability and security updates. Cross Platform Release Notes for Cisco IOS Release 15.8(3)M c1900universalk9mzspa1583m7bin top