While using a packet analyzer， you notice four additional bytes being added to the packets in the Company network. Which protocol inserts a four byte tag into the Ethernet frame and recalculates CRC value？ （）
- A、 DTP
- B、 VTP
- C、 802.1Q
- D、 ISL
- E、 None of the other alternatives apply
正确答案:C
答案解析:有
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