There are many settings within my ZA Free Firewall that are unchecked. Although I already have a feeling that for max security I should keep the option I listed as 4 unchecked, I am still unsure about the others.

1: Block all fragments
2: Block trusted servers
3: Enable ARP protection
4: Allow uncommon protocols at high security
5: Lock Hosts File

Should any of these be checked on (selected)? or Should I just leave them all as they are (unchecked/off/default)?