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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. What is the function of the LACP system priority in EtherChannel negotiation?

    Answer: It determines which switch controls which ports become active when more than 8 links are configured

    The LACP system priority determines which switch is the 'master' when more than 8 links are bundled; the master chooses which 8 links are active and which are hot-standby.

  2. Which command configures the LACP port priority on an interface to influence which links are selected as active in a bundle?

    Answer: lacp port-priority 100

    'lacp port-priority' sets the priority value on an interface; lower values are preferred, making that port more likely to be selected as an active link.

  3. Which EtherChannel load-balancing method is most effective when multiple clients communicate with a single server through the switch?

    Answer: Source and destination IP address (XOR)

    Using both source and destination IP (XOR hash) distributes flows across links even when many clients share the same destination, providing better load distribution than either address alone.

  4. Which command displays the currently configured EtherChannel load-balancing method on a Cisco switch?

    Answer: show etherchannel load-balance

    'show etherchannel load-balance' displays the global load-balancing policy currently applied to all EtherChannel bundles on the switch.

  5. Which two PAgP modes will successfully form an EtherChannel when configured on opposite ends of a link?

    Answer: Desirable – Auto

    PAgP requires at least one side in 'desirable' mode; 'desirable–auto' works because desirable actively initiates and auto responds, while 'auto–auto' never initiates and 'on' uses no protocol.

  6. A network engineer configures an EtherChannel but notices only some member ports are active. The switch shows flags 'I' on those ports. What does 'I' indicate?

    Answer: The port stands alone and is not part of any bundle due to a configuration incompatibility

    The 'I' (independent) flag in 'show etherchannel summary' means the port is not bundled, typically because its speed, duplex, or VLAN settings differ from the other member ports.

  7. What is the correct sequence to configure a Layer 2 EtherChannel using LACP between two switches?

    Answer: Configure 'channel-group X mode active/passive' on member interfaces; the port-channel interface is created automatically

    Applying 'channel-group X mode active' (or passive) on member interfaces automatically creates the port-channel logical interface; no manual port-channel creation is needed.