The security engineer receives an incident ticket from the helpdesk stating that DNS lookup
requests are no longer working from the office. The network team has ensured that Layer 2 and
Layer 3 connectivity are working. Which of the following tools would a security engineer use to
make sure the DNS server is listening on port 53?
A.
PING
B.
NESSUS
C.
NSLOOKUP
D.
NMAP