Cisco Resilient Configuration Feature:

A.
Required additional space to store IOS image file

B.
Remote storage required to save IOS image

C.
Can be disabled …remote session

D.
Automatically detects image or config.version missmatch

Explanation:
The following factors were considered in the design of Cisco IOS Resilient Configuration:
+ The configuration file in the primary bootset is a copy of the running configuration that was
in the router when the feature was first enabled.
+ The feature secures the smallest working set of files to preserve persistent storage space.
No extra space is required to secure the primary Cisco IOS image file.
+ The feature automatically detects image or configuration version mismatch .
+ Only local storage is used for securing files, eliminating scalability maintenance challenges
from storing multiple images and configurations on TFTP servers.
+ The feature can be disabled only through a console session
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_cfg/configuration/15-mt/sec-usr-cfg-
15-mt-book/sec-resil-config.html