Match the DTP Mode with Its Function. (Not All Options Are Used.)

When preparing for Cisco certification exams like CCNA, it's crucial to understand how Dynamic Trunking Protocol (DTP) functions within the context of switching. One of the most commonly encountered questions in exam dumps or training modules is:

“Match the DTP mode with its function. (Not all options are used.)”

At DumpsQueen Official, we understand that mastering such questions is key to passing your exams on the first attempt. This blog will break down each DTP mode, its operational function, and how you can confidently tackle these types of matching questions in your CCNA or networking exams.

What is DTP?

Dynamic Trunking Protocol (DTP) is a Cisco proprietary protocol used to automate the process of trunk link formation between switches. It allows Cisco switches to negotiate and determine whether a link should become a trunk or remain an access port.

Without DTP, trunking must be configured manually. With DTP, the switches can automatically agree on trunking behavior, making configuration easier but also opening the door to potential misconfigurations or security risks.

Why Understanding DTP Modes Matters in Exams

In Cisco exams, you're not just expected to memorize terms—you need to understand their practical application. That's why the question:

"Match the DTP mode with its function. (not all options are used.)"

...is a perfect test of both knowledge and comprehension. It also regularly appears in DumpsQueen practice tests and real-world scenarios.

DTP Modes Explained

There are five main DTP modes used on Cisco switches. Each has a specific behavior when it comes to trunk negotiation:

DTP Mode	Function
Access	Forces the interface into a permanent access (non-trunking) mode.
Trunk	Forces the interface to become a permanent trunk, no negotiation.
Dynamic Auto	Passive mode that waits for the other side to initiate trunking.
Dynamic Desirable	Actively attempts to negotiate trunking with the other device.
Nonegotiate	Disables DTP; trunking must be manually configured on both ends.

Let’s dive deeper into each of these DTP modes to match them correctly with their functions.

1. Access Mode

Behavior: Puts the port into a non-trunking mode regardless of the other side’s configuration.
Function: Forces the interface to operate as an access port only.
Use Case: When connecting end devices like PCs or printers to switch ports.

2. Trunk Mode

Behavior: The port becomes a trunk port unconditionally.
Function: Sends DTP frames to the peer but does not wait for negotiation.
Use Case: You know that both ends of the link must be trunk ports.

3. Dynamic Auto Mode

Behavior: Passive negotiation of trunking.
Function: Becomes a trunk if the peer port is set to trunk or dynamic desirable.
Use Case: When minimal configuration is desired and trunking is optional.

4. Dynamic Desirable Mode

Behavior: Actively sends DTP frames to form a trunk if possible.
Function: Initiates negotiation to become a trunk.
Use Case: Useful when you want the port to actively try to become a trunk when the peer supports it.

5. Nonegotiate Mode

Behavior: Disables all DTP traffic.
Function: Used when connecting to a device that does not support DTP, like non-Cisco switches or routers.
Use Case: Trunking must be manually configured on both ends.

How to “Match the DTP Mode with Its Function”

Now let’s apply this understanding to a typical exam question format you might see:

Sample Question

Match the DTP mode with its function. (Not all options are used.)

DTP Mode	Function
A. Dynamic Desirable	1. Disables DTP negotiation.
B. Access	2. Negotiates to form a trunk (actively).
C. Trunk	3. Forces the port to non-trunking mode.
D. Nonegotiate	4. Forces the port to be a trunk.
E. Dynamic Auto	5. Waits passively for trunking requests.

Correct Matches:

A → 2
B → 3
C → 4
D → 1
E → 5

Explanation:

Dynamic Desirable actively tries to form a trunk.
Access disables trunking entirely.
Trunk turns the port into a trunk unconditionally.
Nonegotiate turns off all DTP messages.
Dynamic Auto waits for the other side to initiate trunking.

DTP Mode Compatibility Table

This table shows how different combinations of DTP modes on two switch interfaces interact:

Local Port Mode	Remote Port Mode	Resulting Link Mode
Dynamic Desirable	Dynamic Desirable	Trunk
Dynamic Desirable	Dynamic Auto	Trunk
Dynamic Auto	Dynamic Auto	Access
Trunk	Dynamic Auto	Trunk
Trunk	Trunk	Trunk
Access	Any	Access
Nonegotiate	Trunk (manual)	Trunk

This is useful when predicting outcomes in exam simulation or real-life troubleshooting.

Tips for Answering Matching Questions in Cisco Exams

Understand each DTP mode’s intent: Passive vs. active, negotiation vs. forcing.
Pay attention to keywords in the answer choices like “actively,” “passive,” “forces,” and “disables.”
Eliminate options that clearly don’t fit. Remember, not all options are used in this question format.
Practice makes perfect: Use platforms like DumpsQueen to drill these concepts with real-world-style questions.

Why DumpsQueen is Your Trusted Partner

At DumpsQueen Official, we specialize in creating accurate, exam-focused practice questions that prepare you for the real CCNA and Cisco certification environment. Our dumps, PDF guides, and simulation exams all feature critical concepts like DTP and trunk negotiation protocols.

With a library updated by experts and used by thousands of successful candidates, DumpsQueen ensures you are never blindsided by the “match the DTP mode with its function” type of question.

Conclusion

Understanding the statement: “Match the DTP mode with its function. (Not all options are used.)”…is more than just memorization. It’s about knowing the behavior and intent of each DTP mode and how they interact with one another. Use the breakdowns and practice questions in this guide to solidify your understanding.

And if you're preparing for your Cisco exams, remember: Practice is power—and DumpsQueen gives you the power to pass.