350-601 Security Practice Question
A network engineer is configuring VLAN ACLs on a Cisco Nexus 9000 switch to enforce traffic filtering between VLANs. Which configuration step is required to apply a VACL to a VLAN?
⚠ Common exam trap
Cisco often tests the distinction between applying an ACL to an interface versus applying a VACL to a VLAN, and the trap here is that candidates mistakenly think a VLAN access-map is applied directly under the VLAN configuration (like 'vlan 10' mode) rather than using the global 'vlan filter' command.
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
✓
Use the 'vlan filter' command in global configuration mode.
VACLs on Cisco Nexus 9000 switches are applied using the 'vlan filter' command in global configuration mode, which references a VLAN access-map. This command binds the access-map to a specific VLAN, enabling Layer 2 traffic filtering between VLANs without requiring a Layer 3 interface.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Apply the VACL to a Layer 3 interface using 'ip access-group'.
Why it's wrong here
ip access-group applies to interfaces, not VLANs for VACL.
- ✗
Apply the VACL to a physical port using 'mac access-group'.
Why it's wrong here
mac access-group applies MAC ACLs to ports, not VLAN ACLs.
- ✗
Define a VLAN access-map and then apply it under the VLAN configuration.
Why it's wrong here
VACLs are applied globally, not under the VLAN config.
- ✓
Use the 'vlan filter' command in global configuration mode.
Why this is correct
'vlan filter' applies the VACL to a specific VLAN.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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