Is Ubuntu firewall on by default?

Related questions

1. Does CentOS have a firewall?
2. How do I open a port on CentOS?
3. What is iptables command?
4. What is IP table and firewall in Linux?
5. What is mangle in iptables?
6. Why does Linux not need antivirus?
7. What is the use of firewall in Linux?
8. What is firewall in Linux?
9. What is the difference between iptables and Firewalld?
10. What kind of firewall does iptables implement?

Tags

1. #firewall
2. #connections
3. #ubuntu
4. #allowed
5. #default
6. #disabled
7. #configured
8. #following
9. #incoming