Practice Test GeeksCisco CCNA Practice Test
← All Cisco CCNA Flashcard Decks

EtherChannel and Link Aggregation Flashcards

7 cards from real Cisco CCNA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 EtherChannel and Link Aggregation flashcards as text

  1. Which command on a Cisco switch assigns a physical interface to EtherChannel group 1 using LACP active mode?

    Answer: channel-group 1 mode active

    The 'channel-group 1 mode active' interface command assigns the port to port-channel 1 and enables LACP active negotiation.

  2. For an EtherChannel to form successfully, which of the following must match on all member ports?

    Answer: Port speed and duplex, native VLAN, and allowed VLANs

    All EtherChannel member ports must have identical speed, duplex, native VLAN, and allowed VLAN lists or the bundle will not form.

  3. Which command verifies the status of all EtherChannel bundles on a Cisco switch?

    Answer: show etherchannel summary

    'show etherchannel summary' displays the port-channel group number, protocol, ports, and bundle state (SU = Layer 2 in use) in a compact format.

  4. What does the flag 'D' indicate for a port in the output of 'show etherchannel summary'?

    Answer: The port is down and not part of the active bundle

    The 'D' flag in 'show etherchannel summary' indicates the port is down, meaning it is not contributing to the active EtherChannel bundle.

  5. How does Spanning Tree Protocol (STP) treat an EtherChannel bundle?

    Answer: STP treats the entire EtherChannel as a single logical link

    STP sees the entire EtherChannel port-channel as a single logical interface, so it does not block individual member links, allowing all bundled links to carry traffic.

  6. What happens when you configure one side of a link with EtherChannel mode 'On' and the other side with mode 'Active' (LACP)?

    Answer: The EtherChannel fails to form because 'On' mode does not send or respond to negotiation packets

    'On' mode forces EtherChannel without any negotiation protocol; it will not respond to LACP or PAgP packets, so the channel will not form with a negotiating peer.

  7. A Layer 3 EtherChannel differs from a Layer 2 EtherChannel in that it:

    Answer: Has an IP address assigned directly to the port-channel interface

    A Layer 3 EtherChannel is created with 'no switchport' on member interfaces; the port-channel interface itself receives an IP address and acts as a routed interface.