The SD-WAN UNI Maximum L2 Frame size must be at least 1522 bytes.

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Multiple Choice

The SD-WAN UNI Maximum L2 Frame size must be at least 1522 bytes.

Explanation:
The important idea is how Ethernet frame size changes when VLAN tagging is added. A standard Ethernet frame can carry up to 1500 bytes of payload, plus 14 bytes for the header and 4 bytes for the FCS, totaling 1518 bytes. When a single VLAN tag (802.1Q) is added, that tag adds 4 bytes, so the maximum frame size becomes 1522 bytes. In SD-WAN UNI deployments, customer traffic is often VLAN-tagged as it traverses the WAN, so the UNI must support frames up to at least 1522 bytes to avoid fragmentation or drops. That makes the statement true. Frames with additional tagging (like QinQ) could be larger, but 1522 is the baseline the UNI must handle.

The important idea is how Ethernet frame size changes when VLAN tagging is added. A standard Ethernet frame can carry up to 1500 bytes of payload, plus 14 bytes for the header and 4 bytes for the FCS, totaling 1518 bytes. When a single VLAN tag (802.1Q) is added, that tag adds 4 bytes, so the maximum frame size becomes 1522 bytes. In SD-WAN UNI deployments, customer traffic is often VLAN-tagged as it traverses the WAN, so the UNI must support frames up to at least 1522 bytes to avoid fragmentation or drops. That makes the statement true. Frames with additional tagging (like QinQ) could be larger, but 1522 is the baseline the UNI must handle.

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