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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IPv6 Routing | 20% | - OSPFv3/IS-IS for IPv6 - IPv6 static and dynamic routing |
| Topic 2: Troubleshooting | 10% | - Issue resolution strategies - Network diagnostics |
| Topic 3: Advanced BGP Features | 10% | - BGP policy controls - Route reflector and attributes |
| Topic 4: MPLS Technologies | 19% | - MPLS VPN basics - MPLS LDP and TE |
| Topic 5: Network O&M | 7% | - Monitoring and health metrics - Operation & maintenance best practices |
| Topic 6: Advanced Ethernet Technologies | 10% | - MAC/security features - VLAN and Ethernet enhancements |
| Topic 7: Advanced IGP Features | 17% | - IS-IS advanced optimisations - OSPF advanced capabilities |
| Topic 8: Network Cutover | 7% | - Rollback procedures - Migration planning techniques |
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NEW QUESTION # 52
OSPF supports equal-cost load balancing. When the number of equal-cost routes on the network is greater than the number specified in the maximum load-balancing command, and the interface priorities and interface indexes are the same, the routes with smaller next-hop IP addresses are selected for load balancing.
Answer: B
Explanation:
OSPF supports equal-cost multi-path (ECMP) routing. When multiple equal-cost paths to the same destination exist, and the number of paths exceeds the limit configured using the maximum load-balancing command, Huawei routers prioritize route selection as follows:
* Interface priority
* Interface index
* Smaller next-hop IP addresses (if the above are equal)
This ensures deterministic and consistent ECMP behavior.
# Official Reference from Huawei:
" If the number of equal-cost routes exceeds the maximum number of routes supported by the device, the device selects the routes based on interface priority and then interface index. If those are the same, the device selects the ones with smaller next-hop IP addresses. "
- [Huawei HCIA-Datacom Certification Guide - OSPF Chapter]
NEW QUESTION # 53
As shown in the figure, this is an MPLS message with multiple layers of labels nested. Which of the following is the correct value of the S field at the three positions S1, S2, and S3?
Answer: A
NEW QUESTION # 54
In order to publish IPv6 routes in BGP4+, what fields are added in Update?
Answer: B
NEW QUESTION # 55
IEIF has extended the functions of OSPF by taking advantage of the strong scalability of OSPF. To enable it to support IPv6 networks, the expanded protocol is called OSPFv3, and OSPFv3 is compatible with OSPFv2.
Answer: B
NEW QUESTION # 56
On the network shown in the figure, a network engineer finds that the path between PC1 and PC2 is not the optimal path , and all links along the path have the same cost .
Given this, which of the following routers may be the root bridges of the Layer 2 network?
Options:
Answer: B,C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the Spanning Tree Protocol (STP) and Root Bridge Selection
* Spanning Tree Protocol (STP) is used to prevent loops in a Layer 2 network by electing a Root Bridge and determining a loop-free topology.
* The Root Bridge is elected based on the lowest Bridge ID (BID) , which consists of:
* Priority Value (Lower is preferred, default is 32768).
* MAC Address (Lower MAC wins in case of a tie).
* The optimal forwarding path is chosen based on cost , which is usually determined by the link bandwidth .
Why the Path is Not Optimal?
* The network engineer states that all links have the same cost , meaning that the STP Root Bridge election determines the topology rather than cost differences.
* The fact that the path between PC1 and PC2 is suboptimal suggests that the Root Bridge may not be ideally placed .
Determining the Likely Root Bridge:
* The Root Bridge is the switch with the lowest BID (priority + MAC).
* All switches calculate the shortest path to the Root Bridge and place ports in either Forwarding or Blocking mode.
* From the diagram, the traffic is flowing through SW2 # SW4 # SW3 instead of directly via SW2 # SW3.
* This suggests that the Root Bridge is likely SW1 or SW4 because:
* Root Bridges do not block any ports.
* If SW1 or SW4 is the Root Bridge, the spanning tree topology might force the path to take a longer route.
Key Takeaways:
* Root Bridge selection influences the entire Layer 2 forwarding path.
* The lowest Bridge ID (priority + MAC) determines the Root Bridge.
* If a suboptimal path is taken, the Root Bridge is likely placed in a location that forces certain links to block.
* In this scenario, SW1 or SW4 is the most probable Root Bridge, forcing traffic through an unintended path.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Huawei HCIP-Datacom Official Certification Guide , Chapter on Spanning Tree Protocol (STP) and Root Bridge Selection .
* Huawei Datacom Training Materials , Section on STP Convergence and Network Optimization .
* Huawei Datacom Configuration Guide , Command Reference for STP Root Bridge Selection and Path Calculation .
NEW QUESTION # 57
......
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