Implementing Cisco IP Switched Networks (CCNP SWITCH, legacy) — Question 18

What is the value of the TPID/tag protocol identifier of QinQ?

Answer options

• A. 0x8a88
• B. 0x8100
• C. 0x8b45
• D. 0x8200

Correct answer: A

Explanation

The correct answer is A, 0x8a88, which is the designated TPID for QinQ (802.1ad). The other options represent different protocols: B (0x8100) is for standard VLAN tagging, C (0x8b45) is not a recognized TPID, and D (0x8200) is used for other types of tagging.