VLANs and Link Aggregation Flashcards
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A network administrator configures VLAN translation on an Aruba CX switch. What does this feature accomplish?
Answer: It maps an incoming VLAN tag to a different VLAN ID as traffic enters the switch
VLAN translation (also called VLAN mapping) rewrites the VLAN ID of incoming frames, enabling connectivity between networks using different VLAN numbering schemes.
What happens to a LAG member port on Aruba CX when its physical link goes down while LACP is active?
Answer: The port is automatically removed from the LAG and traffic redistributes across remaining members
When a LAG member's physical link fails, LACP detects the failure and removes the port from the bundle, redistributing load to the remaining active members.
Which VLAN range is reserved for internal use and cannot be assigned to user ports on Aruba CX switches?
Answer: 4094 and above (implementation-specific reserved range)
Aruba CX reserves certain VLAN IDs at the upper end of the range (near 4094) for internal switch operations, and these cannot be assigned to user-facing ports.
An Aruba CX switch is configured with QinQ (802.1ad). What is the outer tag called in a double-tagged frame?
Answer: S-Tag (Service Tag)
In 802.1ad QinQ, the outer tag is the S-Tag (Service Tag) added by the service provider, while the inner tag is the C-Tag (Customer Tag) from the customer's network.
When configuring LACP system priority on an Aruba CX switch, which value results in the switch having higher authority in LAG negotiations?
Answer: Lower system priority value
A lower LACP system priority value gives the switch higher authority to determine which ports are active when there are more ports than the LAG maximum allows.
An administrator needs to verify that VLAN 100 exists and is active on an Aruba CX switch. Which command provides this information?
Answer: show vlan 100
'show vlan 100' displays the status, name, and port membership of VLAN 100, confirming whether it exists and is active.
What is the primary advantage of using LACP over a static LAG on an Aruba CX switch?
Answer: LACP automatically detects and responds to link failures and misconfigurations without manual intervention
LACP continuously exchanges PDUs to detect link failures, miscabling, and configuration mismatches, providing automatic recovery that static LAG cannot offer.