350-501 Question #11: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An engineer is preparing to implement link aggregation configuration. Which statement al about this configuration is true?

Options

• AThe switch port actively sends packets to negotiate an EtherChannel using PAgP
• BThe switch port accepts LACP and PAgP packets from a connected peer and negotiate an
• CThe switch port passively negotiates an EtherChannel if it receives PAgP packets from a
• DThe switch port negotiates an EtherChannel if it receives LACP packets from a connected peer

Explanation

When a switch port is configured with PAgP 'desirable' mode for link aggregation, it actively sends PAgP packets to initiate and negotiate an EtherChannel with a connected peer.

Common mistakes.

• B. A single PAgP or LACP mode does not accept both protocols simultaneously; it is configured for one specific negotiation protocol.
• C. A switch port configured in PAgP auto mode would passively negotiate, meaning it would only form an EtherChannel if it receives PAgP packets, whereas desirable mode is active.
• D. This statement describes behavior related to LACP, not PAgP, and the question implies a PAgP context by referencing options A and C.

Concept tested. PAgP (Port Aggregation Protocol) modes

Reference. https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/consolidated/configuration_guide/b_3se_consolidated_3850_cfg/b_3se_consolidated_3850_cfg_chapter_011000.html#concept_819B140081BF4868A7D0D97E0C003D16

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