Do I need a firewall?

Comodo Internet Security - CIS Firewall Help - CIS
#1

I am behind a cisco router that has a firewall do I need the Comodo firewall?
Thanks

#2

You will always need a Firewall (Comodo or something else) to check for applications behaviour.

#3

A hardware firewall does not protect against unwanted outgoing traffic.

#4

ok, thanks for the info.