Which of the following descriptions about the characteristics of Eth-Trunk is incorrect?

Question

Options

• AEth-Trunk can be a Layer 2 interface or a Layer 3 interface.
• BEth-Trunk is a logical interface
• CThere are at least 2 Eth-Trunk member links
• DThere is at least 1 active Eth-Trunk link

• A
  5% (1)
• B
  11% (2)
• C
  84% (16)

Explanation

Option C is incorrect because Eth-Trunk only requires a minimum of 1 member link - not 2. You can configure an Eth-Trunk with a single physical interface, making it fully valid even before adding additional members.

Why the other options are all correct (and therefore wrong answer choices):

• A is correct: Eth-Trunk is flexible - it can be configured as a Layer 2 switched interface or assigned an IP address to act as a Layer 3 routed interface.
• B is correct: Eth-Trunk is indeed a logical (virtual) interface that aggregates one or more physical member links - the bundle itself has no physical port.
• D is correct: At least 1 member link must be in an active (up/forwarding) state for the Eth-Trunk to pass traffic; having members configured but all down means the trunk itself is down.

Memory tip: Confuse "member links" with "active links" and you'll fall into the trap - C sounds plausible because we associate link aggregation with multiple links, but the spec allows a single-member trunk. Remember: minimum 1 member, minimum 1 active - both thresholds are 1, not 2.

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