Answer:
Port 443
Explanation:
This is the Hypertext Transfer Protocol Secure that combines the HTTP with a cryptographic protocol, which can be used for payment transactions and other secure transmission of data from Web pages. Whenever you connect to a website beginning with "https://" or you see the lock icon, you’re connecting to that web server over port 443.
A set of steps used to complete a specific task.
WDS uses Port 4011 to listen to PXE boot requests
1. C
2. B
3. C
4. A
5. A
6. B
7. C
8. D
9. C
10. B
11. D
12. D
13. D
14. A
15. A
16. B
17. A
18. B
19. D
20. B
Some of the ones towards the start may not be right but I gave it a go :)