You can configure SSH. You can enter crypto key in global mode to see if there is such a command. If so, you can configure SSH, because encryption is required before configuring SSH. The function of this command is encryption. If not, it depends on your version number. You can check the version number with show vers.

Unzip-c2691-advsecurityk 9-mz.124-11.t2.bin and other file names. If there is an advsecurityK9 or K8 in the middle, you must have this command. If your IOS name is base or something, it's gone. You should upgrade your IOS.