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300-410 Practice Question: Is true regarding the use of the 'transport…
Which of the following is true regarding the use of the 'transport input' command on a VTY line?
⚠ Common exam trap
Cisco often tests the default behavior of 'transport input' — many candidates mistakenly believe it defaults to allowing both Telnet and SSH, but the actual default is to allow only Telnet (or 'all' on some platforms, but not both).
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The 'transport input ssh' command allows only SSH connections, blocking Telnet.
The 'transport input ssh' command explicitly restricts the VTY line to accept only SSH connections, blocking Telnet and other protocols. This is a common security best practice to ensure encrypted remote administration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
If 'transport input' is not configured, the VTY line defaults to allowing both Telnet and SSH.
Why it's wrong here
The default is typically 'telnet' only, not both.
- ✓
The 'transport input ssh' command allows only SSH connections, blocking Telnet.
Why this is correct
This restricts the VTY to SSH only, enhancing security.
- ✗
The 'transport input none' command allows all protocols.
Why it's wrong here
'transport input none' blocks all incoming connections.
- ✗
The 'transport input' command applies to both inbound and outbound VTY connections.
Why it's wrong here
It only affects inbound connections; outbound connections are controlled by 'transport output'.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.