EtherChannel bundles multiple physical links into a single logical port-channel. The CCNA tests LACP vs PAgP vs static EtherChannel, the mode combinations that form a channel, and common configuration errors. These appear as configuration tasks and troubleshooting scenarios.
Start Scenario PracticeDrag and drop the steps of LACP active/passive mode negotiation into the correct order, from first to last.
Explanation: LACP negotiation starts with active ports sending LACPDUs, passive ports listening, then exchanging system/port priorities, selecting aggregator, and finally forming the bundle.
Drag and drop each PAgP port mode on the left to its matching negotiation behavior on the right.
Explanation: Desirable initiates negotiation, auto waits for partner.
Which three statements about LACP (Link Aggregation Control Protocol) are true? (Choose three.)
Explanation: 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.
Drag and drop each EtherChannel port state on the left to its matching description on the right.
Explanation: Bundled ports actively forward traffic; stand-alone ports operate individually; suspended ports are disabled due to misconfiguration.
Which two statements about PAgP (Port Aggregation Protocol) are true? (Choose two.)
Explanation: 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.
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Practice all EtherChannel and LACP ScenariosEtherChannel bundles multiple physical links into a single logical port-channel. The CCNA tests LACP vs PAgP vs static EtherChannel, the mode combinations that form a channel, and common configuration errors. These appear as configuration tasks and troubleshooting scenarios. These appear throughout the 350-401 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 350-401. Practicing each scenario type ensures you're ready for any format.
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