When an interface receives an untagged frame, the interface adds a tag with the PVID to the frame and sends the frame to the switch for processing. When an interface receives a tagged frame, the switch does not add a tag with the PVID to the frame.
https://support.huawei.com/enterprise/en/doc/EDOC1000089036/60b1f2f0/basic-concepts-of-vlan
No in fact it is a very feasible and logical answer. I did the exam a few weeks ago and and i failed for 500 points because the exam logic has that kind of tricky questions.
Indeed, when the port of a switch receives a frame that does not have a VLAN tag then a tag is added which is the same as the PVID, but the question says "add a PVID to the frame" and therein lies the error because what is added is a VLAN tag with a value equal to the PVID but not that a PVID is added. PVID stands for Port Default VLAN ID and it is the VLAN ID of an interface, that is, PVID is associated to ports not to frames. Adding a VLAN ID to the frame is not the same as adding a PVID to the frame, PVID is for ports only. For this reason the answer is false
When an interface receives an untagged frame, the interface adds a tag with the PVID to the frame and sends the frame to the switch for processing. When an interface receives a tagged frame, the switch does not add a tag with the PVID to the frame.
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