Which statement is correct about this configuration snippet?
A.
Both voice and data traffic are tagged on ge-0/0/0.
B.
Voice traffic is tagged on ge-0/0/0, but data traffic is not.
C.
Data traffic is tagged on ge-0/0/0, but voice traffic is not.
D.
Neither voice nor data traffic is tagged on ge-0/0/0.
Explanation:
Both VLAN’s were tagged on the interface but done 2 different ways. The first adds
the interface ge-0.0.0 to the VOIP vlan from the ethernet-switching-options voip hierarchy, and the
second adds the data vlan from the interface configuration hierarchy
I think it’s wrong. When you set up a port as access you don’t tag traffic in the port. The switches tag it when it leaves the port towards another one.
The correct answer is C
I would rather have the question phrased differently.
Switches add and remove the dot1q tag (or tags of qinq is enabled) but in the case of voip setup on the port the voip phone has a built-in switch. Traffic egress from the switch is tagged for voice and untagged for data, tagged frames go to the voip phone for processing and untagged frames are forwarded by the phone to the end-device/PC/Printer.
I would go with B.
B.
Voice traffic is tagged on ge-0/0/0, but data traffic is not
I agree
the Data traffic will not be tagged as this is an Access port
the Voice traffic on the other hand is tagged.
See fast track study guide – chapter 2 page 13 and Junos Enterprise switching page 560 – chapter 10 – IP telephony.
Both point to the same, traffic ingress and egress from the voip enabled access port sends the voice vlan as dot1q tagged and data vlan as native/no dot1q tag.
Clearly correct answer is B.