MikroTik MTCNA

Which option in the configuration of a wireless card must be disabled to cause the router to permit ONLY known clients listed in the access list to connect? 

MikroTik RouterOS is sending logs to an external syslog server. Which protocol and port is used by RouterOS for sending logs (by default)?

Mangle Routing (routing-mark) is possible, by using chains: 

NAT rule is going to catch SMTP traffic and send it to a specific mail server. What is the correct action for a NAT rule?

How long is level 1 (free) license valid?