Why is Ubuntu permissive with outgoing connections by default?

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http://askubuntu.com – I am pretty newbie to Linux, as most of computers for resources in my school use Linux, I just installed Ubuntu to learn. By default iptables and ufw sets policy as under: IPTABLES -P INPUT DROP IPTABLES -P FORWARD DROP IPTABLES -P OUTPUT ACCEPT ufw default deny (default incoming). In both cases, Linux all distros trust all applications including fames ftp, smtp, SSH, mail and all others allowing for outgoing traffic without notice or without concent. Which in turn leaves all 0-to-65535 ports open for outgoing traffic for all installed applications. Furthermore, there is no particular a (HowTos)