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 between switches. Which technology should the engineer configure to achieve this?
IEEE 802.1Q tagging is the correct choice because it is the industry standard for VLAN tagging on Ethernet frames, allowing traffic from multiple VLANs to traverse a single link (a trunk). It allows switches to identify which VLAN a frame belongs to. The other options are incorrect. Multiprotocol Label Switching (MPLS) is a WAN technology used by service providers to create efficient traffic paths. Point-to-Point Protocol (PPP) is a data link layer protocol used to establish a direct connection between two nodes, often over serial or dial-up links. High-Level Data Link Control (HDLC) is an older data link protocol used on synchronous serial links.
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What is a VLAN and why is it important?
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What does 802.1Q tagging do specifically?
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How does 802.1Q compare to other protocols like MPLS?