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

Question

Options

• AThe total bandwidth of an Eth-Trunk interface is the sum of the bandwidths of all members. In this
• BEach physical interface that makes up an Eth-Trunk interface is called a member interface.
• CIn the Eth Trunk interface, if a member port status is Down, traffic can still rely on other ports for
• DManual mode can not only detect link disconnection, but also detect link failures and

• A
  5% (2)
• B
  16% (6)
• C
  5% (2)
• D
  74% (28)

Explanation

Option D is incorrect because Manual mode Eth-Trunk can only detect physical link disconnection (a port going physically Down) - it cannot detect logical link failures such as a remote-end fault or unidirectional link issues. That capability belongs to LACP mode, which continuously exchanges Link Aggregation Control Protocol PDUs to verify end-to-end link health and catch failures that don't physically drop the port. Options A, B, and C are all accurate: Eth-Trunk does aggregate member bandwidths (A), individual physical ports are correctly termed "member interfaces" (B), and traffic automatically fails over to remaining active ports when one member goes Down (C). Memory tip: Think "Manual = mechanical only" - manual mode is simple and only catches what a cable tester would catch (the wire is cut), while LACP is "smart" and can detect subtler failures through protocol handshake.

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