300-170 · Question #102
Which action does a VEM on a Cisco Nexus 1000V Series Switch take when an untagged packet is received on an access port?
The correct answer is A. It adds the ports access VLAN to the packet. When an untagged packet arrives on an access port of a Cisco Nexus 1000V VEM, the VEM adds the VLAN ID configured for that access port to the packet.
Question
Which action does a VEM on a Cisco Nexus 1000V Series Switch take when an untagged packet is received on an access port?
Options
- AIt adds the ports access VLAN to the packet.
- BIt adds a native VLAN tag to the packet.
- CIt drops the packet.
- DIt forwards the packet as is.
How the community answered
(16 responses)- A94% (15)
- B6% (1)
Why each option
When an untagged packet arrives on an access port of a Cisco Nexus 1000V VEM, the VEM adds the VLAN ID configured for that access port to the packet.
For an access port on a Cisco Nexus 1000V VEM, when an untagged packet is received, the VEM adds the configured access VLAN ID as a tag to the packet before forwarding it internally, effectively assigning the packet to that specific VLAN.
Native VLAN tags are primarily associated with trunk ports for untagged traffic, but on an access port, the untagged packet is simply assigned the access VLAN ID, not a native VLAN tag.
The VEM does not drop untagged packets on an access port; instead, it processes them by adding the access VLAN tag for proper forwarding.
The VEM does not forward the packet as is because access ports are designed to associate untagged traffic with a specific VLAN ID for internal forwarding within the switch.
Concept tested: Nexus 1000V VEM access port untagged packet handling
Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus1000v/sw/4_0/layer2/configuration/guide/n1000v_l2_cli/vlan.html#wp1074052
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