This 200-901 practice question tests your understanding of network fundamentals. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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.
Which TWO statements about VLAN trunking are true?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Trunk links carry traffic for multiple VLANs.
Trunk links carry traffic for multiple VLANs simultaneously by tagging each frame with a VLAN identifier. This allows a single physical link to transport traffic from different VLANs between switches or between a switch and a router. Option C is correct because the primary purpose of a trunk is to multiplex VLAN traffic over one link.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Access ports belong to a single VLAN; trunk ports are used for trunking.
✓
Trunk links carry traffic for multiple VLANs.
Why this is correct
Trunk links allow multiple VLANs by tagging frames.
Related concept
Read the scenario before looking for a memorised answer.
✓
Trunk links require 802.1Q encapsulation.
Why this is correct
802.1Q is the standard for VLAN tagging on trunk links.
Related concept
Read the scenario before looking for a memorised answer.
✗
Trunk links are used to connect a switch to a single host.
Why it's wrong here
Trunk links connect switches or routers, not individual hosts.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that trunk links are used to connect end hosts (like PCs or servers), when in fact trunk links are only used between network infrastructure devices (switches, routers, firewalls) to carry multiple VLANs.
Detailed technical explanation
How to think about this question
802.1Q encapsulation inserts a 4-byte tag into the Ethernet frame, containing a 12-bit VLAN ID (0–4095), allowing up to 4094 VLANs per trunk. In a real-world scenario, a trunk link between a distribution switch and a core switch might carry hundreds of VLANs, and misconfiguration (e.g., native VLAN mismatch) can cause traffic leaks or black holes. The Dynamic Trunking Protocol (DTP) can negotiate trunking, but Cisco recommends manually setting trunk mode to avoid security risks.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Fundamentals — This question tests Network Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Trunk links carry traffic for multiple VLANs. — Trunk links carry traffic for multiple VLANs simultaneously by tagging each frame with a VLAN identifier. This allows a single physical link to transport traffic from different VLANs between switches or between a switch and a router. Option C is correct because the primary purpose of a trunk is to multiplex VLAN traffic over one link.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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