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VLANs and Link Aggregation Flashcards

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

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  1. Two Aruba CX switches are connected with a LAG. The administrator notices only half the expected bandwidth is being utilized. What should be investigated first?

    Answer: The load-balancing hash may be producing skewed distribution

    Uneven LAG utilization is most commonly caused by hash polarization, where most flows map to the same member port.

  2. What IEEE standard defines the 802.1Q VLAN tagging mechanism used on Aruba switches?

    Answer: 802.1Q

    IEEE 802.1Q defines the standard for VLAN tagging, including the 4-byte tag inserted into Ethernet frames to identify the VLAN.

  3. On an Aruba CX switch, a port configured as 'trunk' with native VLAN 1 receives an 802.1Q-tagged frame with VLAN ID 1. How is this frame handled?

    Answer: The tag is stripped and the frame is treated as an untagged native VLAN frame

    On most implementations, a tagged frame with the native VLAN ID is accepted but the behavior depends on the native VLAN configuration — by default the tag is stripped.

  4. Which protocol does Aruba use for dynamic LAG negotiation that is also an IEEE standard?

    Answer: LACP (802.3ad)

    LACP (Link Aggregation Control Protocol), defined in IEEE 802.3ad (now part of 802.3), is the industry-standard protocol for dynamic LAG negotiation.

  5. An administrator wants to prevent a specific VLAN from being pruned from a trunk on an Aruba CX switch. Which action achieves this?

    Answer: Explicitly add the VLAN to the trunk's allowed VLAN list

    Explicitly listing a VLAN in the trunk's allowed VLAN list ensures it is always carried and not subject to automatic pruning.

  6. What is the function of MLAG (Multi-chassis Link Aggregation) on Aruba CX switches?

    Answer: It allows a LAG to span two physical switches, providing redundancy at the switch level

    MLAG enables a single downstream device to form a LAG with two separate upstream switches, eliminating single-switch failure as a point of network downtime.

  7. In an Aruba CX MLAG deployment, what is the purpose of the ISL (Inter-Switch Link)?

    Answer: To synchronize MLAG state and forward traffic between the two MLAG peers

    The ISL carries both MLAG control plane synchronization and dataplane traffic that needs to traverse from one MLAG peer to the other.