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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. Which hashing algorithm component is NOT typically used by Aruba CX switches for LAG load balancing?

    Answer: VLAN ID of the frame

    LAG load balancing hashes on MAC, IP, and L4 port fields, but VLAN ID is not a standard hashing input for load distribution.

  2. A network engineer configures VLAN 99 as the management VLAN on an Aruba CX switch. Which additional step is required to manage the switch via SSH over VLAN 99?

    Answer: Assign an IP address to the VLAN 99 SVI

    The switch needs an IP address configured on the VLAN 99 SVI (Switch Virtual Interface) to route management traffic.

  3. When using LACP in passive mode on both ends of a link, what is the result?

    Answer: The LAG will never form because neither side initiates negotiation

    LACP passive mode waits for the peer to initiate; if both sides are passive, neither sends PDUs and the LAG never establishes.

  4. On an Aruba CX switch, which VLAN configuration is required before a port can be assigned to that VLAN?

    Answer: The VLAN must be created in the global VLAN database

    A VLAN must exist in the global VLAN database before it can be assigned to any port as an access or trunk VLAN.

  5. What is the purpose of the LACP 'short' timer compared to the 'long' timer?

    Answer: Short timer sends PDUs every 1 second for faster failure detection versus every 30 seconds with long timer

    The LACP short timer transmits PDUs every 1 second (timeout 3 seconds), enabling much faster link failure detection compared to the long timer's 30-second interval.

  6. An Aruba switch trunk port shows VLAN 50 as 'inactive'. What is the most likely cause?

    Answer: VLAN 50 has not been created on the switch

    A VLAN appearing inactive on a trunk most commonly means the VLAN does not exist in the switch's VLAN database.

  7. Which Aruba CX feature allows a single physical switch to be logically divided, with each partition having its own VLAN and routing table?

    Answer: VRF (Virtual Routing and Forwarding)

    VRF creates multiple independent routing instances on a single switch, each with its own routing and forwarding table, enabling network segmentation.