Switch SW1 sends a frame to switch SW2 using 802.1Q trunking. Which of the answers describes how SW1 changes or adds to the Ethernet frame before forwarding the frame to SW2?
- Inserts a 4-byte header and does change the MAC addresses
- Inserts a 4-byte header and does not change the MAC addresses
- Encapsulates the original frame behind an entirely new Ethernet header
- None of the other answers are correct
Explanation: 802.1Q defines a 4-byte header, inserted after the original frame’s destination and source MAC address fields. The insertion of this header does not change the original frame’s source or destination address. The header itself holds a 12-bit VLAN ID field, which identifies the VLAN associated with the frame.
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