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Huawei H12-831_V1.0 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Cutover | 7% | - Post-cutover validation - Implementation and rollback strategy - Pre-cutover verification - Cutover planning and risk assessment |
| Topic 2: Network Troubleshooting | 10% | - Structured troubleshooting methodology - Performance and service fault resolution - Routing protocol fault diagnosis - Switching and link fault handling |
| Topic 3: Advanced IGP Features | 17% | - IS-IS advanced features
|
| Topic 4: IPv6 Routing | 20% | - IPv6 address planning and configuration - OSPFv3 and IS-IS for IPv6 - Transition mechanisms (dual-stack, tunnel, translation) - BGP4+ for IPv6 |
| Topic 5: Network O&M | 7% | - Log and alarm management - Network monitoring and performance analysis - Configuration management and backup - Routine maintenance procedures |
| Topic 6: MPLS Technologies | 19% | - MPLS VPN (L3VPN, L2VPN) - MPLS fundamentals and label distribution - LDP and RSVP-TE protocols - MPLS OAM and protection |
| Topic 7: Advanced BGP Features | 10% | - BGP route selection and attributes - BGP multi-homing and load balancing - Route reflectors and confederations - Routing policies and filtering |
| Topic 8: Advanced Ethernet Technologies | 10% | - Ethernet link aggregation and reliability - VLAN aggregation and MUX VLAN - QinQ and VLAN mapping - Port isolation and security features |
Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Sample Questions:
The figure shows the LSP information of R1 and R2 on an MPLS network. An administrator runs the ping
3.3.3.3 command on R1. Given this, which of the following statements is true?
- A. The ping packet sent by R1 does not carry any label. After receiving the ping packet, R2 adds a label to the packet and forwards the packet based on MPLS.
- B. The ping packet sent by R1 carries label 1025. After receiving the packet, R2 swaps the label and forwards the packet based on MPLS.
- C. The ping packet sent by R1 carries label 1025. After receiving the packet, R2 removes the label and forwards the packet based on IP addresses.
- D. The ping packet sent by R1 does not carry any label. After receiving the ping packet, R2 forwards it based on IP addresses.
Correct Answer: C 🗳️
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On the network shown in the figure, OSPF runs on R1, R2, and R3, and OSPF BFD is enabled. R1 and R3 use loopback interfaces to establish an iBGP peer relationship. If GE0/0/1 of R2 is shut down, which of the following is the longest period after which the BGP peer relationship of R1 will change from Up to Down?
- A. 180s
- B. 60s
- C. 3s
- D. 40s
Correct Answer: C 🗳️
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Entries in a MAC address table are classified into dynamic, static, and blackhole entries. In addition, the MAC address table of a switch also contains service MAC address entries, which are typically converted from dynamic entries.
- A. FALSE
- B. TRUE
Correct Answer: B 🗳️
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R1 forwards the packet with the destination IP address of 4.4.4.4 on an MPLS network. Some LSP information of R3 is shown in the figure. During packet transmission, which of the following devices perform MPLS label operations?
- A. R4
- B. R1
- C. R2
- D. R3
Correct Answer: B,C,D 🗳️
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On the OSPF network shown in the figure, drag the values on the left to the correct positions so that:
* Traffic from PC1 to PC2 follows the path: PC1 - > R1 - > R3 - > R2 - > PC2
* Traffic from PC2 to PC1 follows the path: PC2 - > R2 - > R1 - > PC1
Which of the following OSPF cost values should be assigned to Cost-A, Cost-B, and Cost-C to achieve this routing behavior?
Correct Answer:
Explanation:
* A = 50
* B = 10
* C = 20
Comprehensive and Detailed In-Depth Explanation:
Understanding OSPF Path Selection and Cost Calculation:
* OSPF selects the shortest path (lowest cost) to the destination.
* The OSPF cost is determined by the cumulative sum of interface costs along a path .
* By assigning specific costs to A, B, and C , we can influence OSPF's path selection to meet the desired routing behavior.
Step-by-Step Analysis of Required Traffic Flow:
1. Traffic from PC1 to PC2 must take the route:
PC1 - > R1 - > R3 - > R2 - > PC2
* To force traffic through R3 , the cost of the direct link R1 - > R2 (Cost-A) must be higher than the alternative path via R3 .
* We assign Cost-A = 50 (high cost) to discourage direct routing from R1 - > R2 .
* The cost of R1 - > R3 (Cost-C) should be lower , so we assign Cost-C = 20 .
* The cost of R3 - > R2 (default Cost-20) remains unchanged.
* Total cost via R3: 20 (R1- > R3) + 20 (R3- > R2) = 40 , which is less than the direct link of 50 , so OSPF prefers this path.
# Traffic follows: PC1 - > R1 - > R3 - > R2 - > PC2
2. Traffic from PC2 to PC1 must take the route:
PC2 - > R2 - > R1 - > PC1
* We need to make R2 - > R1 (Cost-B) the best (lowest cost) route for return traffic .
* Assign Cost-B = 10 (low cost).
* This ensures that R2 prefers the direct path R2 - > R1 instead of R2 - > R3 - > R1 (which costs
20+20=40).
# Traffic follows: PC2 - > R2 - > R1 - > PC1
Final Cost Assignments for Correct Routing Behavior:
Cost
Assigned Value
Reason
Cost-A (R1 - > R2)
50
High to discourage direct R1- > R2 routing
Cost-B (R2 - > R1)
10
Low to ensure PC2- > PC1 prefers direct R2- > R1
Cost-C (R1 - > R3)
20
Medium to encourage R1- > R3- > R2 path
Key Takeaways:
* Higher OSPF cost discourages path selection.
* Lower OSPF cost encourages path selection.
* By manipulating OSPF cost values, we achieve asymmetric routing between PC1 and PC2.
* This aligns with OSPF path selection principles covered in HCIP-Datacom certification.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Huawei HCIP-Datacom Official Certification Guide , Chapter on OSPF Cost Calculation and Path Selection .
* Huawei Enterprise Networking Training Materials , OSPF Path Optimization Techniques.
* Huawei Datacom Configuration Guide , OSPF Cost and Traffic Engineering.
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