000-221 · Question #197
Given the output below, what is the purpose of the ent5 and ent6 interfaces?
The correct answer is A. Provides multiple logical networks using the IEEE 802.1 Q standard. On AIX, ent5 and ent6 are VLAN pseudo-adapters that use IEEE 802.1Q tagging to provide multiple logical networks over a single physical Ethernet interface.
Question
Given the output below, what is the purpose of the ent5 and ent6 interfaces?
Exhibit
Options
- AProvides multiple logical networks using the IEEE 802.1 Q standard
- BMonitors packet headers and creates the appropriate default routes
- CEnables primary and backup EtherChannel adapter failover monitoring
- DAllows the use of a IPv4 alias within the same subnet as the base adapter
How the community answered
(34 responses)- A79% (27)
- B12% (4)
- C6% (2)
- D3% (1)
Why each option
On AIX, ent5 and ent6 are VLAN pseudo-adapters that use IEEE 802.1Q tagging to provide multiple logical networks over a single physical Ethernet interface.
IEEE 802.1Q is the standard for VLAN tagging, allowing a single physical adapter to carry traffic for multiple logical networks by inserting a VLAN tag into Ethernet frames. On AIX, VLAN pseudo-devices (such as ent5 and ent6) are created on top of a physical adapter to represent each distinct VLAN. This is the standard use case for such numbered virtual Ethernet adapters in AIX networking.
Monitoring packet headers to create default routes describes a routing or traffic-shaping function, not what VLAN pseudo-adapters do.
Primary and backup EtherChannel failover monitoring describes an EtherChannel (IEEE 802.3ad link aggregation) configuration, not VLAN tagging.
An IPv4 alias on the same subnet is configured via ifconfig or smitty, not through VLAN pseudo-adapter devices.
Concept tested: AIX VLAN pseudo-adapters and IEEE 802.1Q tagging
Source: https://www.ibm.com/docs/en/aix/7.3?topic=adapters-virtual-local-area-network-vlan
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