A、Three or more login requests have failed within the last 100 seconds.

B、When the router goes into quiet mode， any host is permitted to access the router via Telnet，actual   SSH， and HTTP， since the quiet-mode access list has not been configured.

C、The login block-for command is configured to block login hosts for 93 seconds.

D、All logins from any sources are blocked for another 193 seconds.