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350-401 Practice Question: An engineer is deploying a Linux virtual machine…
An engineer is deploying a Linux virtual machine on a KVM hypervisor. The VM needs to be connected to a virtual network that provides isolation from other VMs on the same host but allows communication with the host and external networks. The engineer creates a Linux bridge and attaches the VM's tap interface to it. However, the VM cannot reach the external network. The host has a physical NIC (eth0) connected to the corporate network. What is the missing configuration step?
⚠ Common exam trap
It's easy for candidates to confuse bridging with NAT or routing, assuming that IP forwarding or NAT is required for external access, when in fact a bridged setup simply needs the physical NIC as a bridge port to extend Layer 2 connectivity.
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
✓
Add the physical NIC (eth0) as a port to the Linux bridge.
A Linux bridge acts like a virtual switch. To allow the VM to reach the external network, the physical NIC (eth0) must be added as a port to the bridge. This bridges the VM's tap interface with the host's physical network, enabling Layer 2 connectivity to the corporate network and upstream routing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Add the physical NIC (eth0) as a port to the Linux bridge.
Why this is correct
Correct because the bridge must include the physical NIC to forward traffic to the external network.
- ✗
Configure a default gateway on the VM's network interface.
Why it's wrong here
Incorrect because the VM likely has a gateway, but the bridge is not connected to the physical network.
- ✗
Assign an IP address to the Linux bridge interface.
Why it's wrong here
Incorrect because the bridge interface IP is for the host, not for VM connectivity.
- ✗
Enable IP forwarding and configure NAT on the host.
Why it's wrong here
Incorrect because NAT is not needed if the bridge is connected to the physical network.
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Last reviewed: Jun 24, 2026
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