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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IPv6 Routing | 20% | - IPv6 address planning and configuration - BGP4+ for IPv6 - OSPFv3 and IS-IS for IPv6 - Transition mechanisms (dual-stack, tunnel, translation) |
| Topic 2: Network O&M | 7% | - Configuration management and backup - Log and alarm management - Network monitoring and performance analysis - Routine maintenance procedures |
| Topic 3: MPLS Technologies | 19% | - MPLS fundamentals and label distribution - MPLS VPN (L3VPN, L2VPN) - MPLS OAM and protection - LDP and RSVP-TE protocols |
| Topic 4: Network Cutover | 7% | - Cutover planning and risk assessment - Post-cutover validation - Implementation and rollback strategy - Pre-cutover verification |
| Topic 5: Advanced IGP Features | 17% | - OSPF advanced features
|
| Topic 6: Network Troubleshooting | 10% | - Routing protocol fault diagnosis - Switching and link fault handling - Performance and service fault resolution - Structured troubleshooting methodology |
| Topic 7: Advanced BGP Features | 10% | - BGP route selection and attributes - Routing policies and filtering - BGP multi-homing and load balancing - Route reflectors and confederations |
| Topic 8: Advanced Ethernet Technologies | 10% | - Port isolation and security features - QinQ and VLAN mapping - Ethernet link aggregation and reliability - VLAN aggregation and MUX VLAN |
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NEW QUESTION # 139
R1 executes the operation ping -a 10.1.1.1 10.5.16.2, what does this command mean?
Answer: A
NEW QUESTION # 140
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 # 141
In the network shown in the figure, R1 and R2 are connected through SW1. If STP is not enabled on SW1, R1 and R2 cannot ping each other.
Answer: A
NEW QUESTION # 142
The MPLS architecture is divided into a control plane and a forwarding plane, which contains multiple protocols and tables. Which of the following tables is responsible for forwarding packets with MPLS labels?
Answer: D
NEW QUESTION # 143
OSPFv2 is an IGP running on an IPv4 network; OSPFv3 is an IGP running on an IPv6 network. The basic working mechanism of OSPFv3 is the same as OSPFv2, such as the election of DR and BDR. As shown in the figure, an engineer uses three routers to test IPv6 services. He wants to realize the interconnection and interoperability of IPv6 networks by running OSPFv3.
Which of the following statements regarding the election of DR on this network is correct?
Answer: A
NEW QUESTION # 144
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