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Exam H12-891 topic 1 question 72 discussion

Actual exam question from Huawei's H12-891
Question #: 72
Topic #: 1
[All H12-891 Questions]

As shown in the figure, Site1 and Site2 need to communicate through a carrier's BGP/MPLS IP VPN. A public network tunnel has been established between PE1 and PE2 (label information is shown in the figure). PE1 has advertised the 192.168.1.0/24 route of Site1 to PE2 through MP-IBGR and route learning is normal. What is the top label in a data packet transmitted on the link P -> PE1 if the packet is sent by Site2 to 192.168.1.0/24 of Site1?

  • A. 3
  • B. 6662
  • C. 6661
  • D. 8888
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Suggested Answer: B 🗳️
by 7c3a129 at Jan. 12, 2024, 7:39 a.m.

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6702b63
1 month, 1 week ago
Only PEs are aware of vpn routing information, while de P device is not. The backbone network uses MPLS tunnel forwarding to avoid routing blackholes. the P device swaps the outer label 6662 with 3 (PH) and forward the packet to PE1
upvoted 1 times
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Fighter2k
9 months, 2 weeks ago
Selected Answer: A
out label should be 3 as it is mentioned in P router as out label for 1.1.1.1/32 route
upvoted 1 times
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7c3a129
10 months, 2 weeks ago
Selected Answer: D
label 3 is implicit so must be poped in penultimate hop
upvoted 2 times
...

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