DNS Records for RDP Connectivity

A network technician is troubleshooting a connectivity issue with Joe, a user.

Joe has reported that when he attempts to RDP to machine1 (192.168.21.21) by name, he is connected to machine3 (192.168.21.23)

When the network technician runs the command nslookup machine1, it returns the IP address 192.168.21.23; but when the ping "a 192.168.21.23 command is run, the results return the hostname machine3

Which of the following DNS records should be updated to allow RDP connections to machine1 by hostname?

A.

A

B.

SRV

C.

PTR

D.

TXT.

A.

The issue reported by Joe suggests that there is a DNS resolution problem. When Joe attempts to RDP to machine1 by its name, he is connected to machine3. This could happen if the DNS resolution is pointing the name machine1 to the IP address of machine3.

To troubleshoot the issue, the network technician runs the command "nslookup machine1" which returns the IP address 192.168.21.23. This confirms that the DNS resolution is indeed pointing to the wrong IP address.

However, when the network technician runs the command "ping -a 192.168.21.23", the result returns the hostname machine3. This indicates that the reverse DNS lookup (from IP address to hostname) is correct and machine3 is indeed located at that IP address.

To allow RDP connections to machine1 by hostname, the A record in the DNS should be updated. An A record maps a hostname to an IP address, so updating the A record for machine1 with the correct IP address (192.168.21.21) will ensure that the RDP connections to machine1 are directed to the correct machine.

In summary, the answer is A - A record should be updated to allow RDP connections to machine1 by hostname.