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350-401 Practice Question: Which three statements about PAgP (Port…
Which three statements about PAgP (Port Aggregation 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
✓
PAgP uses the multicast MAC address 01-00-0c-cc-cc-cc for its protocol frames.
PAgP is a Cisco proprietary protocol for EtherChannel negotiation. It uses modes 'auto', 'desirable', and 'on'. PAgP packets are sent using Cisco's proprietary multicast address 01-00-0c-cc-cc-cc. PAgP supports up to 8 ports per channel and does not support standby ports. PAgP can detect misconfigurations.
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 protocol frames.
Why this is correct
Correct because PAgP uses the Cisco proprietary multicast address 01-00-0c-cc-cc-cc.
- ✗
PAgP can negotiate an EtherChannel with a device that runs LACP in active mode.
Why it's wrong here
Incorrect because PAgP and LACP are incompatible and cannot interoperate.
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The PAgP modes 'desirable' and 'auto' will form an EtherChannel only if the neighbor is set to 'desirable' or 'auto'.
Why it's wrong here
Incorrect because 'auto' will only form a channel with 'desirable', not with another 'auto'. 'Desirable' can form with 'desirable' or 'auto'.
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PAgP supports up to 8 ports in a single EtherChannel, with no standby ports.
Why this is correct
Correct because PAgP allows a maximum of 8 active ports and does not support the standby port feature that LACP offers.
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PAgP can detect and report mismatched parameters such as speed and duplex between member ports.
Why this is correct
Correct because PAgP performs parameter checking and will not form the channel if there are mismatches.
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Written by Johnson Ajibi, MSc IT Security
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