A systems administrator is resolving connectivity issues to an organization's DNS server. While troubleshooting, the administrator performs remote scans ana receives the following output: Which or…

The correct answer is C. Firewall rules. DNS requires port 53 to be reachable. The scan output shows port 53 is open, but other expected service ports may be blocked. Since connectivity issues persist despite DNS appearing active, the next step is to examine firewall rules that may be restricting access to or from the…

Submitted by kev92· Mar 6, 2026Network troubleshooting

Question

A systems administrator is resolving connectivity issues to an organization’s DNS server. While troubleshooting, the administrator performs remote scans ana receives the following output:

Which or the following should the systems administrator investigate?

Options

AURL filters
BUnused services
CFirewall rules
D802.1X on the switch

How the community answered

(52 responses)

A
6% (3)
B
4% (2)
C
79% (41)
D
12% (6)

Explanation

DNS requires port 53 to be reachable. The scan output shows port 53 is open, but other expected service ports may be blocked. Since connectivity issues persist despite DNS appearing active, the next step is to examine firewall rules that may be restricting access to or from the DNS server.

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