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Huawei H35-211_V2.5 Exam - Topic 5 Question 87 Discussion

In video services, if the VOD service is normal but the live service encounters a black screen, which of the following are possible causes?
C) On the ONU, the VLAN of the VoD service is different from that of the live service. On the OLT, there is only one video service stream.
A) PQ is used for downstream congestion management of an OLT.
B) DWRR is used for upstream congestion management of an OLT.
D) The traffic profile corresponding to the OLT upstream multicast service flow is set to a low priority.

Huawei H35-211_V2.5 Exam - Topic 5 Question 87 Discussion

Actual exam question for Huawei's H35-211_V2.5 exam
Question #: 87
Topic #: 5
[All H35-211_V2.5 Questions]

In video services, if the VOD service is normal but the live service encounters a black screen, which of the following are possible causes?

Show Suggested Answer Hide Answer
Suggested Answer: C

by Tricia at Jul 01, 2026, 09:33 AM

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Reta
3 days ago
D could also be a factor. Low priority might affect live streaming.
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Serina
8 days ago
Agreed, C makes sense. Live service needs the right VLAN.
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Hildred
13 days ago
I think C is the main issue. Different VLANs can cause problems.
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Edward
19 days ago
Totally agree with C, that’s a classic mistake in setups.
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Glynda
24 days ago
Wait, only one video stream on the OLT? That sounds risky!
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Malcolm
29 days ago
A and B are less likely, right? They deal with congestion, not black screens.
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Johana
1 month ago
I think D is a big factor too, low priority can mess things up.
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Pete
1 month ago
C seems likely, different VLANs could cause issues.
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Coral
1 month ago
I vaguely recall something about OLT configurations affecting service streams, but I can't remember if that was related to upstream or downstream issues.
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Roxane
2 months ago
I feel like we had a practice question about multicast flows and priority settings. Option D might be relevant if the live service is being deprioritized.
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Dylan
2 months ago
I'm not entirely sure about the specifics of DWRR and PQ, but I think they relate to how traffic is prioritized. Could that affect the live stream?
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Elin
2 months ago
I remember we discussed how VLAN mismatches can cause issues in service delivery, so option C sounds plausible.
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