: Specifies the highly flexible "universal" feature set bundle. The k9 designation indicates that the image contains strong cryptographic capabilities (such as triple DES and AES encryption) required for secure SSH management, Transport Layer Security (TLS), and secure IPsec VPN tunnels.
When upgrading a Cisco 2900 series router, you typically use the archive command or copy the file via TFTP/SCP to the flash memory. i--- Download C2900-universalk9-mz.spa.157-3.m8.bin --
Downloading Cisco IOS images requires a Cisco account and access to the Cisco website. Here are the general steps: : Specifies the highly flexible "universal" feature set