A Layer 2 network engineer is configuring a new Ethernet switch in a data center. They need to ensure that the switch tags VLAN information on frames as they pass through the switch. Which technology should the engineer configure to achieve this?
802.1Q tagging is the correct choice because it is the industry standard for VLAN tagging on Ethernet frames. It allows multiple VLANs to use the same network interface without receiving traffic not intended for them. Other options like MPLS, PPP, and HDLC are used in different contexts; for example, MPLS is used across wide-area networks for creating end-to-end circuits and PPP is a protocol used for direct connections between network nodes, which do not involve VLAN tagging on Ethernet frames as specified in the question.
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