cant run commands

Hello! I have some cisco 2600 series routers and a 3620 router. I am trying to study for the SECUR exam. In the book it says to run the new commands that start with security I need IOS 12.3(1) but when I load that IOS the commands never appear in enable mode COmmand examlpe security authentication failure rate

Router(config)#security ? % Unrecognized command

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Mr Cisco Man
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then is not there, ask the tac to do a cross check in the feature navigator for you and find out why those features are not there.

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