Have you ever been on your GradedLabs rack of equipment and wanted to test a particular feature or set of configurations, but you certainly do not want to keep these changes on the rack? Perhaps this is because you are right in the middle of solving a Volume 2 lab and you certainly cannot have that configuration impacted.
Thanks to the very handy config replace command, you can easily rollback almost instantly to your previous saved configuration after your experimenting. Here is a demonstration of just how simple this is.

Rack29R1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Rack29R1(config)#hostname TEST
TEST(config)#interface fastethernet0/0
TEST(config-if)#ip address 1.2.3.4 255.0.0.0
TEST(config-if)#no shut
TEST(config-if)#end
TEST#
TEST#config replace nvram:startup-config force
Total number of passes: 1
Rollback Done
Rack29R1#
Rack29R1#show run interface fa0/0
Building configuration...
Current configuration : 83 bytes
!
interface FastEthernet0/0

no ip address
shutdown
duplex auto
speed auto
end

Rack29R1#

Network Bulls

Cisco training School in India 

Delhi/Gurgaon Corporate Office
Address: Network Bulls M-44, Old DLF, Sector-14, Near Kalyani Hospital 15 minutes drive from IGI Delhi Airport Gurgaon - 122001 Haryana, India E-mail: info@networkbulls.com This e-mail address is being protected from spambots. You need JavaScript enabled to view it. Telephone: +91 124 4369201 /02 /03 /04 , +91 124 4142817, +91 124 4103287 Mobile Phone Number: +91 96546-72192 , +91 9560148409 /10 http://www.networkbulls.com