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350-401 Practice Question: Which three statements about LACP (Link…
Which three statements about LACP (Link Aggregation Control Protocol) are true? (Choose three.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
LACP packets are exchanged using multicast destination MAC address 01-80-c2-00-00-02.
LACP is an IEEE standard (802.3ad) that allows dynamic formation of EtherChannels. It uses LACPDUs to negotiate parameters, supports up to 16 links (8 active, 8 standby), and can detect mismatched parameters like speed or duplex. The 'active' mode initiates negotiation, while 'passive' waits.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
LACP packets are exchanged using multicast destination MAC address 01-80-c2-00-00-02.
Why this is correct
Correct because LACP uses the Slow Protocols multicast address 0180.c200.0002.
- ✓
LACP can place up to 8 links in the active state and an additional 8 links in hot-standby mode.
Why this is correct
Correct per IEEE 802.3ad, which allows up to 16 links total, with 8 active and 8 standby.
- ✗
When using LACP, both sides must be configured with the same system priority to form a channel.
Why it's wrong here
Incorrect because system priority is used to determine which side controls the channel; they do not need to match.
- ✓
LACP automatically detects speed and duplex mismatches and prevents the channel from forming.
Why this is correct
Correct because LACP verifies that all member links have compatible parameters (speed, duplex) before aggregating.
- ✗
LACP operates only in Layer 3 mode and cannot be used for Layer 2 EtherChannels.
Why it's wrong here
Incorrect because LACP works for both Layer 2 and Layer 3 EtherChannels.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.