CCNA Routing and Switching (legacy) — Question 76

Which option is the industry-standard protocol for EtherChannel?

Answer options

• A. PAgP
• B. LACP
• C. Cisco Discovery Protocol
• D. DTP

Correct answer: B

Explanation

LACP (Link Aggregation Control Protocol) is the industry-standard protocol for EtherChannel, allowing the bundling of multiple physical links into a single logical link. PAgP is Cisco's proprietary protocol and not considered an industry standard, while Cisco Discovery Protocol is used for network device discovery, and DTP (Dynamic Trunking Protocol) is utilized for trunk negotiation and not for link aggregation.