A customer is attempting to download a file from a remote FTP server, but receives an error that a connection
cannot be opened. Which of the following should be one FIRST to resolve the problem?A. Ensure that port 20 is open
B.
Ensure that port 161 is open
C.
Flush the DNS cache on the local workstation
D.
Validate the security certificate from the host
Bad formatting.
To easy though answer is A. Ensure that port 20 is open.
Because FTP is 20,21.
port 161 is SNMP.
D does not work as FTP is by nature an insecure protocol so that answer doesn’t make sense.
C does not make sense as you probably are using an IP to remote to the FTP server and not a FQDN so DNS does not work.
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