ACSP VLANs and Link Aggregation 5

Question 1

A network administrator configures VLAN translation on an Aruba CX switch. What does this feature accomplish?

Accepted Answer

It maps an incoming VLAN tag to a different VLAN ID as traffic enters the switch

Answer

VLAN translation (also called VLAN mapping) rewrites the VLAN ID of incoming frames, enabling connectivity between networks using different VLAN numbering schemes.

Question 2

What happens to a LAG member port on Aruba CX when its physical link goes down while LACP is active?

Accepted Answer

The port is automatically removed from the LAG and traffic redistributes across remaining members

Answer

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.

Question 3

Which VLAN range is reserved for internal use and cannot be assigned to user ports on Aruba CX switches?

Accepted Answer

4094 and above (implementation-specific reserved range)

Answer

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.

Question 4

An Aruba CX switch is configured with QinQ (802.1ad). What is the outer tag called in a double-tagged frame?

Accepted Answer

S-Tag (Service Tag)

Answer

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.

Question 5

When configuring LACP system priority on an Aruba CX switch, which value results in the switch having higher authority in LAG negotiations?

Accepted Answer

Lower system priority value

Answer

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.

(ACSP) Aruba Certified Switching Professional Practice Test

(ACSP) Aruba Certified Switching Professional Practice Test

ACSP VLANs and Link Aggregation 5