What is filtered port in nmap?

Related questions

1. What is meant by filtered port?
2. What is a UDP port scan?
3. What is port filtering?
4. What is the difference between filtered ports and closed ports?
5. What is stealth port scan?
6. What is an Nmap scan?
7. How does nmap scan ports?
8. Is it illegal to scan a network?
9. What is stealth scan in nmap?
10. What is UDP port 80 used for?

Tags

1. #filter
2. #firewall
3. #either
4. #whether
5. #network
6. #blocking
7. #connections
8. #listening
9. #closed
10. #cannot
11. #other
12. #state
13. #packets
14. #filtered
15. #means
16. #unfiltered
17. #machine
18. #target
19. #obstacle
20. #application