Which two protocols are used to implement EtherChannel? (Choose two.)
- Link Aggregation Control Protocol
- Spanning Tree Protocol
- Port Aggregation Protocol
- Cisco Discovery Protocol
- Rapid Spanning Tree Protocol
Explanation: Port Aggregation Protocol and Link Aggregation Control Protocol are used to implement EtherChannel. Spanning Tree and Rapid Spanning Tree Protocol are used to prevent switching loops. Cisco Discovery Protocol is Cisco-proprietary and is used to discovery information about adjacent Cisco devices such as model number and IP address.
Exam with this question: CCNA 3 (v5.0.3 + v6.0) Chapter 4 Exam Answers
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