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350-401 Practice Question: Which two statements about DTP (Dynamic Trunking…
Which two statements about DTP (Dynamic Trunking Protocol) are true? (Choose two.)
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
✓
DTP is a Cisco proprietary protocol.
DTP is a Cisco proprietary protocol used to negotiate trunking between switches. The default mode on Cisco switches is dynamic desirable, which will actively try to form a trunk. DTP frames are sent only over access ports when trunking is being negotiated, but not over trunk ports once the trunk is established. The 'switchport nonegotiate' command disables DTP, and trunk formation then relies on manual configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
DTP is a Cisco proprietary protocol.
Why this is correct
DTP is indeed Cisco proprietary and is not standardized in IEEE 802.1Q.
- ✓
The default switchport mode on a Cisco Catalyst switch is dynamic desirable.
Why this is correct
By default, Cisco Catalyst switches use dynamic desirable mode, which actively sends DTP frames to negotiate trunking.
- ✗
DTP frames are sent continuously on a trunk port to maintain the trunk.
Why it's wrong here
DTP frames are sent only during negotiation; once a trunk is established, DTP frames are no longer sent.
- ✗
The 'switchport nonegotiate' command enables DTP on an interface.
Why it's wrong here
The 'switchport nonegotiate' command disables DTP, preventing the interface from sending DTP frames.
- ✗
DTP supports both 802.1Q and ISL trunking encapsulation.
Why it's wrong here
DTP can negotiate both 802.1Q and ISL, but ISL is obsolete and not supported on modern switches; the statement is technically true but misleading in modern contexts, and the question focuses on current implementations where ISL is deprecated.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.