Jack is conducting a port scan of a target network. He knows that his target network has a web server and that a mail server is up and running. Jack has been sweeping the network but has not been able to get any responses from the remote target. Check all of the following that could be a likely cause of the lack of response?

A.
The host might be down

B.
UDP is filtered by a gateway

C.
ICMP is filtered by a gateway

D.
The TCP window Size does not match

E.
The destination network might be down

F.
The packet TTL value is too low and can’t reach the target

Explanation:
Wrong answers is B and D as sweeping a network uses ICMP