ACSP VLANs and Link Aggregation 2 — Questions and Answers
Question 1: An Aruba switch port is configured as a trunk. Which VLAN carries traffic when no VLAN tag is present in the received frame?
- The native VLAN (Correct answer)
- VLAN 1 always
- The management VLAN
- The first allowed VLAN in the trunk list
Correct answer: The native VLAN
On a trunk port, untagged frames are assigned to the native (untagged) VLAN configured on that port.
Question 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?
- Lower numerical value (Correct answer)
- Higher numerical value
- Value of 32768
- Value of 65535
Correct 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.
Question 3: On an Aruba switch, what is the effect of setting a VLAN to 'voice' type on an access port?
- It enables LLDP-MED to automatically configure IP phones on a separate voice VLAN (Correct answer)
- It encrypts all voice traffic on the VLAN
- It blocks all non-voice traffic on that port
- It assigns QoS markings to all frames on the port
Correct 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.
Question 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?
- Traffic is dropped because no negotiation protocol re-establishes the bundle (Correct answer)
- LACP automatically re-establishes the bundle within 30 seconds
- The remaining switch forwards traffic on the surviving physical links
- Traffic is rerouted via STP backup paths immediately
Correct 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.
Question 5: Which Aruba CX command displays the operational state of all LAG interfaces including member port status?
- show lacp interfaces (Correct answer)
- show interface lag summary
- show bonding detail
- show etherchannel summary
Correct answer: show lacp interfaces
'show lacp interfaces' on Aruba CX displays LACP negotiation state and member port operational status for all LAG interfaces.
Question 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?
- Set the trunk allowed VLAN list to 10,20,30 explicitly (Correct answer)
- Remove all VLANs then re-add only 10,20,30
- Configure the port as access on VLAN 10 and add 20,30 as secondary
- Use VLAN ACLs to drop traffic from all other VLANs
Correct 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.
Question 7: What is the maximum number of physical ports that can be members of a single LAG on most Aruba CX switches?
- 8 (Correct answer)
- 4
- 16
- 32
Correct answer: 8
Aruba CX switches typically support up to 8 active member ports per LAG, with additional standby ports possible when using LACP.
ACSP VLANs and Link Aggregation 2
An Aruba switch port is configured as a trunk.
Which VLAN carries traffic when no VLAN tag is present in the received frame?