XK0-004 · Question #361
A Linux administrator needs to run a few virtual machines and containers on the physical machines with a single network interface. Which of the following networking would allow the administrator to co
The correct answer is A. Bridging. Network bridging connects virtual machines and containers to a physical NIC so they appear as independent hosts on the external network, enabling outside connectivity.
Question
A Linux administrator needs to run a few virtual machines and containers on the physical machines with a single network interface. Which of the following networking would allow the administrator to connect with the outside world?
Options
- ABridging
- BVLAN
- CBonding/teaming
- DVPN
How the community answered
(42 responses)- A95% (40)
- B2% (1)
- D2% (1)
Why each option
Network bridging connects virtual machines and containers to a physical NIC so they appear as independent hosts on the external network, enabling outside connectivity.
A network bridge creates a Layer 2 virtual switch that transparently forwards frames between the physical interface and virtual interfaces assigned to VMs or containers, giving each guest its own presence on the external network segment. This allows all VMs and containers to send and receive traffic to and from the outside world through a single physical NIC without requiring NAT or additional hardware.
VLANs logically segment network traffic using 802.1Q tagging but do not by themselves provide external IP connectivity for guests - a bridge or router is still needed to forward traffic outbound.
Bonding and teaming aggregate multiple physical NICs into one logical interface for redundancy or increased throughput, but the scenario specifies a single NIC, making this inapplicable.
A VPN creates an encrypted tunnel to a remote network endpoint and is designed for secure remote access, not for providing general external network connectivity to locally hosted VMs and containers.
Concept tested: Network bridging for VM and container external connectivity
Source: https://www.kernel.org/doc/html/latest/networking/bridge.html
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