very useful Cisco Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_cfg/configuration/xe-3s/sec-usr-cfg-xe-3s-book/sec-login-enhance.html
configure summary:
- enable
- configure terminal
- login block-for seconds attempts tries within seconds
- login quiet-mode access-class {acl-name | acl-number}
- login delay seconds
check login parameters:
- enable
- show login
check login failures:
- enable
- show login failures
Quiet Mode