When this string is followed by "verified," it usually means the MD5 or SHA-512 checksum
This specific binary is widely considered the "gold standard" for network engineers studying for their CCNP or CCIE. Here is why this "verified" status matters and how to get it running in your lab. Why Version 15.2(4)M11?
: Indicates the image runs from RAM and is zip-compressed. 152-4.M11 : The specific software version (15.2(4)M11). How to Verify the Image