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VLANs and Link Aggregation Flashcards

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  1. An Aruba switch port is configured as a trunk. Which VLAN carries traffic when no VLAN tag is present in the received frame?

    Answer: The native VLAN

    On a trunk port, untagged frames are assigned to the native (untagged) VLAN configured on that port.

  2. When configuring LACP on an Aruba CX switch, which port priority value makes a port MORE likely to be selected as an active member of the LAG?

    Answer: Lower numerical value

    LACP uses lower port priority values to indicate higher preference, so a lower number increases the chance of a port being selected as active.

  3. On an Aruba switch, what is the effect of setting a VLAN to 'voice' type on an access port?

    Answer: It enables LLDP-MED to automatically configure IP phones on a separate voice VLAN

    Setting a VLAN type to 'voice' allows LLDP-MED to signal IP phones to use the designated voice VLAN automatically.

  4. A static LAG is configured between two Aruba CX switches. One switch is rebooted. What happens to traffic on the LAG during the reboot?

    Answer: Traffic is dropped because no negotiation protocol re-establishes the bundle

    Static LAGs have no negotiation protocol, so when one end goes down all links in the bundle lose connectivity until the rebooted switch returns.

  5. Which Aruba CX command displays the operational state of all LAG interfaces including member port status?

    Answer: show lacp interfaces

    'show lacp interfaces' on Aruba CX displays LACP negotiation state and member port operational status for all LAG interfaces.

  6. An administrator needs to allow VLANs 10, 20, and 30 on a trunk port while blocking all others. Which configuration approach is correct on Aruba CX?

    Answer: Set the trunk allowed VLAN list to 10,20,30 explicitly

    On Aruba CX trunk ports, specifying an explicit allowed VLAN list restricts the trunk to only those VLANs.

  7. What is the maximum number of physical ports that can be members of a single LAG on most Aruba CX switches?

    Answer: 8

    Aruba CX switches typically support up to 8 active member ports per LAG, with additional standby ports possible when using LACP.