Ethical Hacking Essentials Practice Test

What is a common risk associated with using Telnet in a network?

1. It encrypts user data.

2. It uses a secure authentication mechanism.

3. It transmits data in plaintext.

4. It operates on UDP protocol.

The correct answer is: It transmits data in plaintext.

Using Telnet in a network is associated with the transmission of data in plaintext, which is a significant risk. This means that any data sent or received, including sensitive information such as usernames and passwords, can be intercepted by eavesdroppers. Because Telnet does not incorporate any encryption protocols, all communication is visible to anyone with the ability to capture network traffic. As a result, unauthorized users can easily exploit this vulnerability to gain access to confidential information. The other options highlight characteristics that do not apply to Telnet, reinforcing why the correct choice stands out. For instance, Telnet does not encrypt user data; instead, it openly transmits it, which is directly opposed to the premise of secure communication. Furthermore, it lacks a secure authentication mechanism that would protect user identities and passwords. Lastly, Telnet operates using the TCP protocol rather than UDP, which is another detail that emphasizes its operational characteristics and limitations. Therefore, understanding the plaintext transmission risk is crucial for anyone dealing with network security.