- A
The native VLAN is tagged by default
Why wrong: The native VLAN is not tagged; it is sent untagged.
- B
The VLAN ID is 12 bits long
Correct — the VLAN ID field is 12 bits long.
- C
A 4-byte tag is inserted into the Ethernet frame
Why wrong: Incorrect — not all frames receive a 4-byte tag; native VLAN frames are untagged.
- D
Trunks can only carry one VLAN
Why wrong: Trunks can carry multiple VLANs, not just one.
- E
The frame check sequence (FCS) is recalculated after tagging
Correct — the FCS is recalculated after the tag is inserted because the frame content changes.
Question 274 of 1,000
350-601 802.1Q tag Practice Question
This 350-601 practice question tests your understanding of network. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: 802.1Q tag. 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.
A network engineer is configuring 802.1Q trunking between a Nexus switch and a server. Which TWO statements are true regarding 802.1Q trunking?
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 VLAN ID is 12 bits long
802.1Q trunking uses a 4-byte tag to carry VLAN information, but the native VLAN is sent untagged, so not all frames receive the tag. The VLAN ID field is 12 bits (B), and after tagging, the FCS must be recalculated (E). Option A is false because the native VLAN is untagged. Option C is false because only non-native VLAN frames are tagged. Option D is false because trunks can carry multiple VLANs.
Key principle: 802.1Q tag
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The native VLAN is tagged by default
Why it's wrong here
The native VLAN is not tagged; it is sent untagged.
- ✓
The VLAN ID is 12 bits long
Why this is correct
Correct — the VLAN ID field is 12 bits long.
Related concept
802.1Q tag
- ✗
A 4-byte tag is inserted into the Ethernet frame
Why it's wrong here
Incorrect — not all frames receive a 4-byte tag; native VLAN frames are untagged.
- ✗
Trunks can only carry one VLAN
Why it's wrong here
Trunks can carry multiple VLANs, not just one.
- ✓
The frame check sequence (FCS) is recalculated after tagging
Why this is correct
Correct — the FCS is recalculated after the tag is inserted because the frame content changes.
Related concept
802.1Q tag
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often assume every frame on a trunk gets a 4-byte tag, but the native VLAN is always untagged. The question asks for two true statements; B and E are correct, and C is a common trap.
Detailed technical explanation
How to think about this question
The 802.1Q tag is a 4-byte field inserted between the Source MAC and EtherType, consisting of a 2-byte Tag Protocol ID (TPID = 0x8100) and a 2-byte TCI containing a 3-bit Priority Code Point (PCP), a 1-bit Drop Eligible Indicator (DEI), and the 12-bit VLAN ID. After tagging, the Frame Check Sequence (FCS) must be recalculated because the frame length and content have changed; this is why Option C is also correct.
KKey Concepts to Remember
- 802.1Q tag
- VLAN ID
- Frame Check Sequence (FCS)
- Native VLAN
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
802.1Q tag
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review 802.1Q tag, then practise related 350-601 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this 350-601 question test?
Network — This question tests Network — 802.1Q tag.
What is the correct answer to this question?
The correct answer is: The VLAN ID is 12 bits long — 802.1Q trunking uses a 4-byte tag to carry VLAN information, but the native VLAN is sent untagged, so not all frames receive the tag. The VLAN ID field is 12 bits (B), and after tagging, the FCS must be recalculated (E). Option A is false because the native VLAN is untagged. Option C is false because only non-native VLAN frames are tagged. Option D is false because trunks can carry multiple VLANs.
What should I do if I get this 350-601 question wrong?
Review 802.1Q tag, then practise related 350-601 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
802.1Q tag
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Last reviewed: Jul 4, 2026
This 350-601 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 350-601 exam.
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