What hash type does Cisco use to validate the integrity of downloaded images?

A.
Sha1

B.
Sha2

C.
MD5

D.
Md1

Explanation:
BD
The MD5 File Validation feature, added in Cisco IOS Software Releases 12.2(4)T and 12.0(22)S, allows
network administrators to calculate the MD5 hash of a Cisco IOS software image file that is loaded on a device.
It also allows administrators to verify the calculated MD5 hash against that provided by the user. Once the MD5
hash value of the installed Cisco IOS image is determined, it can also be compared with the MD5 hash
provided by Cisco to verify the integrity of the image file.
verify /md5 filesystem:filename [md5-hash]
Source: http://www.cisco.com/c/en/us/about/security-center/ios-image-verification.html#11