CCNA Plan

CCNA practice question: Network Access

Network AccessDifficulty 3/5

An engineer configures channel-group 1 mode active on switch A and channel-group 1 mode auto on switch B. What happens?

  1. AA static EtherChannel forms
  2. BAn LACP EtherChannel forms
  3. CA PAgP EtherChannel forms
  4. DNo EtherChannel forms because active is LACP and auto is PAgP
Show answer and rationale

Correct: D. 'active' and 'passive' are LACP modes; 'desirable' and 'auto' are PAgP modes. Mixing protocols prevents negotiation, so the bundle never forms and the links operate individually (STP may block one).

  • B — LACP needs active/active or active/passive on both sides.
  • C — PAgP needs desirable/desirable or desirable/auto.
  • A — Static requires mode on at both ends.

Concept being tested

VLANs and trunking, EtherChannel, Rapid PVST+, Cisco wireless architectures and WLAN configuration, physical infrastructure connections. — 20% of the exam. Study guide for Network Access.

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Primary references

  1. CCNA Exam v1.1 (200-301) Exam Topics — Cisco Systems · primary · retrieved 2026-09-21, verified 2026-09-21
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