This 200-301 practice question tests your understanding of network services and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: telnet transmits usernames, passwords, and commands in clear text, making it vulnerable to interception and eavesdropping on the network.. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Why is Telnet generally discouraged for network device administration?
It cannot cross routed networks
Why wrong: Telnet can cross routed networks if connectivity exists.
It sends credentials and commands in clear text
Correct. Lack of encryption is the key weakness.
It supports only local usernames
Why wrong: That is not the core security issue.
It works only from the console port
Why wrong: Telnet is a remote protocol, not a console-only method.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
It sends credentials and commands in clear text
Telnet sends all data, including credentials and commands, in clear text, making it vulnerable to eavesdropping. Option A is wrong because Telnet can traverse routed networks using TCP port 23. Option C is incorrect because Telnet can use local usernames as well as external AAA servers. Option D is false because Telnet works over network interfaces, not exclusively from the console port.
Key principle: Telnet transmits usernames, passwords, and commands in clear text, making it vulnerable to interception and eavesdropping on the network.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
It cannot cross routed networks
Why it's wrong here
Telnet can cross routed networks if connectivity exists.
When this WOULD be correct
If an exam question asked about a specific network configuration where Telnet was being used in a scenario involving a single local subnet without routing, then this option could be correct. For example, a question might state that Telnet is being used exclusively for device management within a flat network topology.
It sends credentials and commands in clear text
Why this is correct
Correct. Lack of encryption is the key weakness.
Related concept
Telnet transmits usernames, passwords, and commands in clear text, making it vulnerable to interception and eavesdropping on the network.
It supports only local usernames
Why it's wrong here
That is not the core security issue.
When this WOULD be correct
In a question that specifically asks about a network device that only allows local authentication methods and does not support external authentication protocols, option C would be correct. For example, if the question stated that a specific router model only permits local username authentication, then this option would apply.
It works only from the console port
Why it's wrong here
Telnet is a remote protocol, not a console-only method.
When this WOULD be correct
If the exam question specifically asked about a protocol that is limited to console access only, such as a proprietary management interface, then option D would be correct. For example, a question might ask about a device management method that does not support remote access.
Option-by-option analysis
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
Why this is correct
Correct. Lack of encryption is the key weakness.
Why this is wrong here
Telnet can indeed cross routed networks, as it operates over TCP/IP and is not limited by network boundaries. This option is incorrect because it misrepresents Telnet's functionality in a networking context.
★ When this WOULD be the correct answer
If an exam question asked about a specific network configuration where Telnet was being used in a scenario involving a single local subnet without routing, then this option could be correct. For example, a question might state that Telnet is being used exclusively for device management within a flat network topology.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of network protocols and their capabilities, leading them to believe that Telnet's limitations are related to routing rather than security concerns.
Why this is wrong here
Option C is incorrect because Telnet does not limit user authentication to local usernames; it can authenticate users against remote servers as well, depending on the device configuration.
★ When this WOULD be the correct answer
In a question that specifically asks about a network device that only allows local authentication methods and does not support external authentication protocols, option C would be correct. For example, if the question stated that a specific router model only permits local username authentication, then this option would apply.
Why candidates choose this
Candidates may find this option tempting because they might confuse Telnet's typical usage with local device management, leading them to believe it only supports local usernames without considering broader authentication capabilities.
Why this is wrong here
Option D is incorrect because Telnet can be used over the network, not just from the console port. It allows remote access to devices, making it suitable for administration from various locations.
★ When this WOULD be the correct answer
If the exam question specifically asked about a protocol that is limited to console access only, such as a proprietary management interface, then option D would be correct. For example, a question might ask about a device management method that does not support remote access.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of Telnet's capabilities, confusing it with other protocols that are indeed limited to console access, leading to the assumption that Telnet is similarly restricted.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Don't confuse protocol support or bandwidth usage with security features. Focus on encryption and data protection.
Detailed technical explanation
Telnet is a legacy network protocol used for remote device management that transmits data, including usernames and passwords, in clear text without encryption. This lack of encryption means that anyone with access to the network path can intercept and read sensitive information, making Telnet inherently insecure for managing Cisco routers and switches. In contrast, secure alternatives like SSH encrypt session data, protecting credentials and commands from eavesdropping. In Cisco networking environments, the decision to avoid Telnet is based on security best practices and compliance with modern standards. Cisco devices support both Telnet and SSH, but SSH is preferred because it uses encryption algorithms to secure the management session. When configuring remote access, network administrators should disable Telnet and enable SSH to ensure confidentiality and integrity of administrative sessions, especially over untrusted or routed networks. A common exam trap is confusing Telnet’s capability to cross routed networks with its security limitations. While Telnet can function across routed networks if connectivity exists, the critical issue is that it sends all data in plain text. Practically, this means Telnet sessions are vulnerable to interception and credential theft, which is unacceptable in secure enterprise environments. Understanding this distinction helps avoid selecting incorrect answers that focus on connectivity rather than security.
Key takeaway
Telnet transmits usernames, passwords, and commands in clear text, making it vulnerable to interception and eavesdropping on the network.
Real-world example
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
Review telnet transmits usernames, passwords, and commands in clear text, making it vulnerable to interception and eavesdropping on the network., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Network Services and Security — This question tests Network Services and Security — Telnet transmits usernames, passwords, and commands in clear text, making it vulnerable to interception and eavesdropping on the network..
The correct answer is: It sends credentials and commands in clear text — Telnet sends all data, including credentials and commands, in clear text, making it vulnerable to eavesdropping. Option A is wrong because Telnet can traverse routed networks using TCP port 23. Option C is incorrect because Telnet can use local usernames as well as external AAA servers. Option D is false because Telnet works over network interfaces, not exclusively from the console port.
Review telnet transmits usernames, passwords, and commands in clear text, making it vulnerable to interception and eavesdropping on the network., then practise related 200-301 questions on the same topic to reinforce the concept.
Telnet transmits usernames, passwords, and commands in clear text, making it vulnerable to interception and eavesdropping on the network.
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Last reviewed: May 17, 2026
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