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Exam JN0-648 topic 1 question 2 discussion

Actual exam question from Juniper's JN0-648
Question #: 2
Topic #: 1
[All JN0-648 Questions]

Click the Exhibit button.

Referring to the exhibit, which two statements are true regarding Q-in-Q tunneling? (Choose two.)

  • A. The C-VLAN traffic will be encapsulated with an outer VLAN tag of 150.
  • B. The C-VLANs 100-200 will be sent as the inner VLAN tag.
  • C. The C-VLAN 150 will be sent as the inner VLAN tag.
  • D. The C-VLAN traffic will be encapsulated with an outer VLAN tag of 10.
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Suggested Answer: BD 🗳️
by mixeren at Dec. 26, 2020, 2:08 p.m.

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wassupkay
2 years, 10 months ago
the post below do not apply to the answer. B and D are the correct. had encapsulation extended-vlan-bridge; be added then the native vlan becomes the client vlan
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hyena
3 years, 7 months ago
https://kb.juniper.net/InfoCenter/index?page=content&id=KB17419
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mixeren
4 years, 4 months ago
Correct answers is A,B. I don't see encapsulations into vlan.10
upvoted 1 times
mixeren
4 years, 4 months ago
sorry, perhaps i'm wrong.
upvoted 2 times
mixeren
4 years, 4 months ago
https://kb.juniper.net/InfoCenter/index?page=content&id=KB33838&cat=QFX_SERIES&actp=LIST
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TQU29
3 years, 10 months ago
Wrong, C and D ! vlan 10 is the S-VLAN, 100-200 are allowed as C-VLAN (inner vlan) but here, the customer port is untagged (native-vlan-id) with vlan 150, so the inner vlan tag will be 150. So C and D are the right answers. https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topic-map/q-in-q.html#id-configuring-q-in-q-tunneling-on-qfx-series-switches
upvoted 2 times
nushadu
3 years, 5 months ago
+1 Sending and Receiving Untagged Packets To enable an interface to send and receive untagged packets, you must specify a native VLAN for a physical interface. When the interface receives an untagged packet, it adds the VLAN ID of the native VLAN to the packet in the C-VLAN field and adds the S-VLAN tag as well (so the packet is double-tagged), and sends the newly tagged packet to the mapped interface.
upvoted 1 times
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