350-501 · Question #11
Refer to the exhibit. An engineer is preparing to implement link aggregation configuration. Which statement al about this configuration is true?
The correct answer is A. The switch port actively sends packets to negotiate an EtherChannel using PAgP. 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.
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
How the community answered
(32 responses)- A91% (29)
- B3% (1)
- C6% (2)
Why each option
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.
The `channel-group mode desirable` command configures a switch port to actively send PAgP packets and initiate negotiation to form an EtherChannel with a compatible peer.
A single PAgP or LACP mode does not accept both protocols simultaneously; it is configured for one specific negotiation protocol.
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.
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
Source: 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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