Cat4500e-universalk9.spa.03.11.05.e.152-7.e5.bin

In the modern Cisco IOS release train, universalk9 has a specific meaning:

Always run the verify /md5 command on the file once uploaded to the switch flash to ensure the file wasn't corrupted during transfer. cat4500e-universalk9.spa.03.11.05.e.152-7.e5.bin

To understand what this file does, we have to decode Cisco’s nomenclature: In the modern Cisco IOS release train, universalk9

This feature template configures the switch to allow secure remote login using a local username/password database, disables insecure Telnet access, and generates the necessary cryptographic keys. disables insecure Telnet access