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A penetration test shows that access from the internet can reveal the name and internal addresses of servers. This is because the private DNS server is being accessed. The administrator has blocked access to UDP port 53 to prevent this but it has not stopped access. How is it most likely the penetration test is able to access the DNS server?
The DNS server is responding on secure DNS port 453
The test is using TCP port 53 and the DNS server is responding
The firewall rules were not set correctly with a less restrictive rule taking precedence
DNS servers can respond to packets on port 53 using UDP and TCP.
This is a horrible question and should be removed. This is to help you critically think about why an ACL is not working.
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