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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Advanced BGP Features | 10% | - Routing policies and filtering - Route reflectors and confederations - BGP route selection and attributes - BGP multi-homing and load balancing |
| Topic 2: Network Cutover | 7% | - Cutover planning and risk assessment - Pre-cutover verification - Implementation and rollback strategy - Post-cutover validation |
| Topic 3: Advanced IGP Features | 17% | - IS-IS advanced features
|
| Topic 4: Advanced Ethernet Technologies | 10% | - VLAN aggregation and MUX VLAN - Ethernet link aggregation and reliability - Port isolation and security features - QinQ and VLAN mapping |
| Topic 5: IPv6 Routing | 20% | - Transition mechanisms (dual-stack, tunnel, translation) - IPv6 address planning and configuration - OSPFv3 and IS-IS for IPv6 - BGP4+ for IPv6 |
| Topic 6: Network Troubleshooting | 10% | - Performance and service fault resolution - Structured troubleshooting methodology - Switching and link fault handling - Routing protocol fault diagnosis |
| Topic 7: Network O&M | 7% | - Log and alarm management - Routine maintenance procedures - Configuration management and backup - Network monitoring and performance analysis |
| Topic 8: MPLS Technologies | 19% | - MPLS VPN (L3VPN, L2VPN) - MPLS fundamentals and label distribution - LDP and RSVP-TE protocols - MPLS OAM and protection |
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NEW QUESTION # 193
In order to protect the BGP protocol from attacks, Keychain authentication can be used between BGP neighbors to reduce the possibility of attacks. The keychain has a set of passwords that can be automatically switched according to the configuration, which is suitable for networks with high security requirements.
Answer: B
NEW QUESTION # 194
What is the most efficient way to view device alarms through the CLI?
Answer: D
NEW QUESTION # 195
In the process of daily troubleshooting, engineers may need to check some alarm information of the device.
Turn on the debugging/log/alarm information sent by the terminal display information center by executing the terminal () command.
(Please use English lowercase letters to complete the command, and the command cannot be abbreviated)
Answer:
Explanation:
monitor
NEW QUESTION # 196
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: A,B
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 # 197
With the increase of business traffic, an enterprise needs to expand the dedicated transmission bandwidth of the backbone network. Which of the following methods can best meet this demand?
Answer: B
NEW QUESTION # 198
......
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