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What is required for a LAN switch to support 802.1q Q-in-Q encapsulation?
Correct Answer: B
Explanation/Reference: Explanation: The default system MTU for traffic on Catalyst switches is 1500 bytes. Because the 802.1Q tunneling (Q- in-Q) feature increases the frame size by 4 bytes when the extra tag is added, you must configure all switches in the service-provider network to be able to process maximum frames by increasing the switch system MTU size to at least 1504 bytes. Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/25ew/configuration/ guide/conf/tunnel.html