* The error message in the image indicates that the network engineer is trying to connect to the switch using telnet, which is a protocol that allows remote access to a device over a network1.
* However, telnet is an insecure protocol that sends data in plain text, which can be easily intercepted and compromised by attackers1.
* Therefore, most modern switches do not support telnet by default, and require a more secure protocol such as SSH (Secure Shell), which encrypts the data and provides authentication and integrity2.
* To connect to the switch using SSH, the network engineer needs to use a different command, such as
"ssh 10.1.200.1" instead of "telnet 10.1.200.1".
* Alternatively, the network engineer can use a console cable to connect directly to the switch and configure it locally3.
* The other options are less likely to cause the error message, as they would result in different messages or symptoms, such as "Access denied", "Timeout", or "No response". References:
* 1: CompTIA Network+ N10-008 Cert Guide, 1st Edition, Chapter 14: Network Security, p. 574
* 2: CompTIA Network+ N10-008 Cert Guide, 1st Edition, Chapter 14: Network Security, p. 575
* 3: CompTIA Network+ N10-008 Cert Guide, 1st Edition, Chapter 2: Network Devices, p. 64