350-601 Security Practice Question
In a private VLAN configuration, a host in a community VLAN needs to communicate with a host in the primary VLAN. What configuration is required on the switch?
⚠ Common exam trap
Cisco often tests the misconception that a community VLAN host can directly communicate with a primary VLAN host without a promiscuous port, or that the primary VLAN host must be on a community port, confusing the roles of promiscuous and community ports in private VLANs.
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 host in primary VLAN must be on a promiscuous port
In a private VLAN configuration, a host in a community VLAN can communicate with a host in the primary VLAN only if the host in the primary VLAN is on a promiscuous port. The promiscuous port can communicate with all other ports in the private VLAN, including community and isolated ports, enabling inter-VLAN traffic through a Layer 3 gateway or a server connected to that port.
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 host in community VLAN must be on an isolated port
Why it's wrong here
Isolated ports cannot communicate with any other ports except the promiscuous port.
- ✓
The host in primary VLAN must be on a promiscuous port
Why this is correct
The primary VLAN host must be on a promiscuous port to allow communication from community VLAN.
- ✗
The host in community VLAN must be on a promiscuous port
Why it's wrong here
Community VLAN hosts should be on community ports, not promiscuous.
- ✗
The host in primary VLAN must be on a community port
Why it's wrong here
Community ports are associated with community VLANs, not primary VLANs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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