yes, allows applications to open ports for itself
no, hacking risk, and no need
no, leave default
Thanks for the prompt reply. I have more questions:
(1) "renew DHCP Lease", default is 1 day?
(2) "enable IPv6 connection sharing", default is yes?
(3) check "5GHz network name" Pane under Wireless Options, default is not checked?
(4) "enable Access Control" default is no?
(5) "Share Disks over WAN" default is no?