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350-401 Practice Question: Which two statements about PAgP (Port Aggregation…
Which two statements about PAgP (Port Aggregation Protocol) are true? (Choose two.)
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
✓
PAgP uses the multicast MAC address 01-00-0C-CC-CC-CC for its messages.
PAgP is a Cisco proprietary protocol for dynamic EtherChannel formation. It uses multicast address 01-00-0C-CC-CC-CC, supports modes 'auto' and 'desirable', and uses a learning method to detect misconfigurations. PAgP cannot interoperate with LACP and does not support standby links.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
PAgP uses the multicast MAC address 01-00-0C-CC-CC-CC for its messages.
Why this is correct
Correct because PAgP uses the Cisco-proprietary multicast address 0100.0CCC.CCCC.
- ✗
PAgP supports up to 16 active links in a single EtherChannel.
Why it's wrong here
Incorrect because PAgP supports a maximum of 8 active links, with no standby links.
- ✓
PAgP can form a channel even if one side is configured in 'auto' mode and the other in 'desirable' mode.
Why this is correct
Correct because 'desirable' actively initiates negotiation, and 'auto' responds, allowing channel formation.
- ✗
PAgP uses the same packet format as LACP and can interoperate with LACP-enabled devices.
Why it's wrong here
Incorrect because PAgP is Cisco proprietary and incompatible with the IEEE standard LACP.
- ✗
PAgP requires both ends to be configured with identical port priorities to form the channel.
Why it's wrong here
Incorrect because PAgP does not use port priority; it uses the port ID only for tie-breaking, but priorities do not need to match.
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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.