Helga’s web server is placed behind her corporate firewall. Currently, her firewall allows only VPN connections from other remote clients and networks. She wants to open the internet-facing interface on her firewall so that it allows all users on the Internet to access her web server. Which of the following must Helga’s rule contain?
A.
Instructions allowing all UDP connections with a destination port of 80 and a source port of 1024
B.
Instructions allowing all UDP connections with a source port of 80 on the external interface and a destination port of 1024
C.
Instructions allowing all TCP connections with a source port of 80 on the internal interface and a destination port of 80
D.
Instructions allowing all TCP connections with a source port higher than 1024 and a destination port of 80
Explanation:
HTTP uses TCP port 80, so as a server, which will be a destination for the client, needs to be 80. All ports from 0-1023 are reserved for servers and are called well known ports. All ports above 1023 are used by clients as their source port. This will allow the web server to be used.
Incorrect Answers:
A: HTTP uses TCP, not UDP.
B: HTTP uses TCP, not UDP.
C: Since the ports used by the client are above 1023, both addresses will not be the same. One address should be a well known port (below 1024) for the server and for the client a port above 1023.