350-601 Network Practice Question
Exhibit
show running-config interface ethernet 1/1 ! interface Ethernet1/1 switchport mode trunk switchport trunk allowed vlan 10,20,30 spanning-tree port type edge trunk no shutdown
Refer to the exhibit. An engineer is configuring a server-facing interface on a Nexus switch. The server is running VMware ESXi with multiple virtual machines in VLANs 10, 20, and 30. After applying the configuration, the ESXi host reports that it cannot communicate on VLAN 30. Which configuration change should be made?
⚠ Common exam trap
Cisco often tests the misconception that configuring a VLAN on an interface (e.g., 'switchport trunk allowed vlan add 30') automatically creates the VLAN in the global database, but in NX-OS, the VLAN must be explicitly created first.
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
✓
Create VLAN 30 in the global VLAN database
VLAN 30 must exist in the global VLAN database before it can be used on any interface. Even though the interface configuration allows VLAN 30 as a trunked VLAN, the switch will not forward traffic for a VLAN that has not been created globally. Without the 'vlan 30' command in global configuration mode, the VLAN is not present in the switch's VLAN database, and the interface will not pass traffic for that VLAN.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Remove the 'spanning-tree port type edge trunk' command
Why it's wrong here
Edge trunk is appropriate for server-facing ports and does not cause communication failure.
- ✗
Change the native VLAN to 30
Why it's wrong here
Native VLAN is used for untagged traffic; not the issue here.
- ✓
Create VLAN 30 in the global VLAN database
Why this is correct
If VLAN 30 does not exist, the switch will not forward traffic for it even if allowed on the trunk.
- ✗
Configure the port as an access port in VLAN 30
Why it's wrong here
The server expects trunk mode; changing to access would break other VLANs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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