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| Certification Vendor: | Huawei |
|---|---|
| Exam Name: | HCIP-Datacom-Advanced Routing & Switching Technology V1.0 |
| Exam Number: | H12-831_V1.0 |
| Passing Score: | 600/1000 |
| Exam Price: | USD 180 |
| Exam Format: | Single-answer questions, Multiple-answer questions, Short response items, Drag-and-drop items, True or false |
| Related Certifications: | HCIP-Datacom-Core Technology V1.0 HCIE-Datacom |
| Available Languages: | Japanese, English, Chinese |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years |
| Real Exam Qty: | 60 |
| Recommended Training: | HCIP-Datacom-Advanced Routing & Switching Training |
| Exam Registration: | Pearson VUE Registration Huawei Talent Portal |
| Sample Questions: | Huawei H12-831_V1.0-ENU Sample Questions |
| Exam Way: | Online or onsite via Pearson VUE test centers |
| Pre Condition: | HCIA-Datacom certification or equivalent knowledge recommended; HCIP-Datacom-Core Technology knowledge is highly recommended |
| Official Syllabus URL: | https://e.huawei.com/en/talent/#/cert/exam-detail?code=H12-831_V1.0 |
>> New H12-831_V1.0-ENU Exam Answers <<
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NEW QUESTION # 69
On an enterprise network shown in the figure, if CE2 is dual-homed to PE2 and PE3, a routing loop may occur during the exchange of Type 3 LSAs. To prevent the loop, the dn-bit-set disable command can be run on PE2 and PE3.
Answer: A
Explanation:
# Background:
* This is an MPLS VPN with OSPF as the PE-CE routing protocol .
* CE2 is dual-homed to both PE2 and PE3 , creating the possibility of route feedback/loops between the PEs through CE2.
# What Causes the Loop?
* Normally, when a route is redistributed from BGP into OSPF on the PE, the OSPF DN bit is set in the Type 3 or Type 5 LSA.
* The DN bit tells other routers: " Do not redistribute this route back into BGP ."
* CE2, not understanding the DN bit, may ignore it and re-advertise the route from PE2 to PE3 and vice versa.
# Problem:
* If both PE2 and PE3 accept the redistributed LSA from CE2 and re-inject it into the VPN, a routing loop can occur.
# Solution:
* To avoid this, Huawei supports the command:
bash
CopyEdit
dn-bit-set disable
* This command disables DN-bit marking on the PE, avoiding potential loop prevention issues with non- DN-bit-aware CEs.
# Final answer: A. TRUE
Official Huawei Extract:
" In dual-homing OSPF VPN scenarios, routing loops may occur due to Type 3 LSA exchange if the CE does not process DN-bit. Running dn-bit-set disable on the PE prevents loop issues by not setting the DN-bit. "
- [Huawei HCIA-Datacom Certification Guide - OSPF in MPLS VPN and DN-Bit Handling]
NEW QUESTION # 70
In the IS-IS network shown in the figure, R1 introduces the default route through the "default- route-advertise always level-1" command. Which device is the next hop corresponding to the default route in R3's routing table?
Answer: D
NEW QUESTION # 71
The engineer used two routers to test the IPv6 service and simulated the interconnection between the headquarters and the branch by running BGP4+. As shown in the figure, an engineer captured the packet to check the Updte message sent by R1. Regarding the description of the message information, which of the following statements are correct? (Multiple choice)
Answer: A,B,D
NEW QUESTION # 72
The figure shows an MPLS packet with multiple labels .
Which of the following values for the S field is correct?
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding MPLS Label Stack and the S (Bottom of Stack) Bit
* MPLS (Multiprotocol Label Switching) packets can have multiple labels stacked on top of each other.
* Each label has the following fields:
* Label (20 bits): Identifies the forwarding path.
* EXP (3 bits): Used for QoS/priority marking.
* TTL (8 bits): Time-to-live, similar to IP TTL.
* S (1 bit): Bottom of Stack (BoS) indicator :
* S = 0: This is not the last label in the stack.
* S = 1: This is the last label in the stack , meaning the next header is the IP header .
2. Analyzing the MPLS Packet Structure in the Figure
* The diagram shows three MPLS headers (labels).
* The last MPLS header before the IP header must have S = 1, indicating the bottom of the stack .
* All other MPLS headers above it must have S = 0, meaning they are part of the stacked labels.
3. Evaluating the Answer Choices
Option
S1
S2
S3
Correct?
Reasoning
A
3
2
1
# Incorrect
S field cannot have values greater than 1.
B
2
1
0
# Incorrect
S field must be 0 for non-bottom labels.
C
1
1
0
# Incorrect
There should be only one label with S = 1 (BoS).
D
0
0
1
# Correct
Only the last label should have S = 1.
# Correct answer: D. S1 = 0, S2 = 0, S3 = 1
Final Conclusion:
* Only the last MPLS label (closest to the IP header) should have S = 1.
* All previous MPLS labels should have S = 0.
* Thus, the correct answer is: D. S1 = 0, S2 = 0, S3 = 1
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - MPLS Label Stack and Header Format Huawei Official HCIP-Datacom Study Guide - MPLS Label Encoding and Forwarding Huawei Documentation on MPLS Label Stack and Bottom of Stack (BoS) Bit
NEW QUESTION # 73
In the preparation phase of a migration project, the software and hardware need to be checked. Match the operation objects in the preparation phase with the corresponding operation contents.
Answer:
Explanation:
Explanation:
Network cable # Use a tester to check connectivity.
Device version file # Check the size of the software package and check whether the file matches the device model.
Board # Install the board on a device that is not connected to the network and observe the running status of the device.
License # Check whether the license is in the validity period to prevent device functions from being affected.
Migration personnel list # Check whether responsibilities and permissions are clearly assigned.
Comprehensive and Detailed In-Depth Explanation:
1. Network Cable - Connectivity Testing:
* Before starting a migration project, all network cables should be tested for physical connectivity issues.
* Network testers can be used to detect any breaks, shorts, or incorrect wiring.
* Ensuring proper connectivity avoids delays and troubleshooting issues during the migration.
2. Device Version File - Software Compatibility Check:
* Firmware and software versions must be verified before upgrading or migrating network devices.
* The device version file should match the model and hardware specifications to avoid compatibility issues.
* If incorrect software is used, the device may not function properly or could become inoperable.
3. Board - Installation and Hardware Verification:
* Before installing new hardware modules (boards, line cards, etc.) into a production environment, they should be tested in isolation.
* Testing ensures the board is operational and does not introduce faults into the system.
* If a board is faulty, it can cause device failure or unexpected behavior in the migration.
4. License - Validity and Activation Check:
* Some network devices require licenses for full functionality (e.g., advanced routing, security features).
* If a license is expired or missing, critical functions may be disabled after migration.
* Checking license status in advance prevents unexpected downtime or service disruptions.
5. Migration Personnel List - Roles and Responsibilities Assignment:
* Large network migrations require clear responsibility assignments for each team member.
* A migration personnel list ensures that everyone knows their role, tasks, and permissions.
* Proper coordination avoids miscommunication, errors, and project delays.
Key Takeaways:
# Network cables should be tested for connectivity.# Software versions should match the hardware model to prevent incompatibility.# Hardware boards should be tested before installing into production.
# Licenses should be verified to prevent service disruptions.# Migration personnel roles should be clearly defined for smooth execution.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Huawei HCIP-Datacom Official Certification Guide, Chapter on Network Migration Best Practices
.
* Huawei Enterprise Networking Whitepapers, Guidelines on Software & Hardware Pre-checks for Migration.
* Huawei Technical Documentation, License Management in Huawei Datacom Devices.
NEW QUESTION # 74
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