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350-401 Practice Question: Which two statements about VLAN trunking using…
Which two statements about VLAN trunking using IEEE 802.1Q 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
✓
The 802.1Q tag includes a 12-bit VLAN ID field.
Correct: A is true because 802.1Q inserts a 4-byte tag after the source MAC address, which includes a 12-bit VLAN ID (0-4095). B is true because the native VLAN is not tagged; frames on the native VLAN are sent untagged to maintain backward compatibility with devices that do not understand trunking. C is incorrect because the native VLAN can be any VLAN, not just VLAN 1; it defaults to VLAN 1 but can be changed. D is incorrect because the 802.1Q tag uses a TPID of 0x8100, not 0x88A8 (which is used for Q-in-Q). E is incorrect because 802.1Q supports up to 4094 usable VLANs (1-1001 and 1006-4094), not 4096.
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 802.1Q tag includes a 12-bit VLAN ID field.
Why this is correct
Correct because the 802.1Q header contains a 12-bit VLAN ID (VID) allowing up to 4094 VLANs.
- ✓
The native VLAN is not tagged on an 802.1Q trunk.
Why this is correct
Correct because 802.1Q leaves frames on the native VLAN untagged for interoperability.
- ✗
The native VLAN must always be VLAN 1.
Why it's wrong here
Incorrect because the native VLAN is configurable and can be any VLAN, though it defaults to VLAN 1.
- ✗
The 802.1Q tag uses a TPID value of 0x88A8.
Why it's wrong here
Incorrect because 0x88A8 is the TPID for Q-in-Q (802.1ad); 802.1Q uses 0x8100.
- ✗
802.1Q supports a maximum of 4096 VLANs.
Why it's wrong here
Incorrect because the 12-bit VID allows 4096 values, but VLANs 0 and 4095 are reserved, leaving 4094 usable VLANs.
Visual reference
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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Last reviewed: Jun 18, 2026
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