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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Solution | 2% | - Integrated network design scenarios |
| Topic 2: IPv6 | 3% | - IPv6 addressing and routing |
| Topic 3: Routing Fundamentals | 3% | - Network basics and routing principles |
| Topic 4: Network Reliability | 8% | - Redundancy and failover mechanisms |
| Topic 5: Network Security | 9% | - ACL and basic security mechanisms |
| Topic 6: Large-scale WLAN Architecture | 6% | - Enterprise WLAN deployment basics |
| Topic 7: IS-IS | 8% | - IS-IS protocol fundamentals |
| Topic 8: Network Service and Management | 2% | - Network management basics |
| Topic 9: BGP | 17% | - BGP path selection - BGP policy and attributes |
| Topic 10: Multicast | 9% | - IGMP and PIM concepts |
| Topic 11: Routing and Traffic Control | 10% | - Policy-based routing - Traffic engineering basics |
| Topic 12: OSPF | 16% | - OSPF areas and LSDB - OSPF core concepts |
| Topic 13: Switching Technologies | 7% | - VLAN and STP fundamentals |
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質問 # 194
A wide area network (WAN) is a remote network that connects local area networks (LANs) or metropolitan area networks (MANs) in different areas for communication purposes. It is typically used to interconnect campus networks or data center networks.
正解：A
解説：
Comprehensive and Detailed Step-by-Step Explanation:
* WAN Definition:
* A WAN is a large-scale network spanning a wide geographical area, connecting smaller networks such as LANs and MANs.
* Use Cases:
* WANs are commonly used for interconnecting campus networks, branch offices, and data centers over long distances.
* Correct Statement:
* The statement accurately describes the purpose and scope of WANs.
References:
* HCIA-Datacom Study Guide, Chapter: WAN Fundamentals
* Huawei Networking Basics
質問 # 195
Among the routing policy tools commonly used in BGP, which of the following can be used to filter routes? (Multiple choice)
正解：A、B、D
質問 # 196
The command format of the prefix list (IP-Prefx) is ip ip-prefx ip-prefix-name [index index-number] permit | deny] ipv4-address mask-length [ greater-equal greater- equal-value] [less -equal less-equal- value], if only greater-equal is specified and less-equal is not specified, the prefix range is:
正解：C
質問 # 197
When deploying BFD, you need to adjust some parameters so that it can better detect the network status.
Which of the following statements is false about BFD optimization?
正解：C
解説：
Comprehensive and Detailed Step-by-Step Explanation:
1. Overview of BFD Optimization:
* BFD (Bidirectional Forwarding Detection) is a protocol that provides rapid detection of link failures.
* Optimizing BFD involves adjusting parameters to balance between detection speed and network stability.
2. Analysis of Each Statement:
Option A: After a high priority is configured for BFD packets, BFD packets are preferentially forwarded.
* Correct (True Statement).
* High priority ensures that BFD packets are not delayed or dropped under congestion, improving detection accuracy.
Option B: To quickly learn about the network status and performance requirements, you can set the interval for sending BFD packets to the minimum value.
* Incorrect (False Statement).
* Setting the interval to the minimum value can lead to excessive BFD session flapping, which may overload the network or cause instability. The interval should be configured based on network requirements and conditions, rather than set to the minimum.
Option C: On a live network, some devices switch traffic only when a BFD session changes to the Up state... configure a delay to compensate for the time difference.
* Correct (True Statement).
* This is a valid optimization to avoid issues caused by timing mismatches between BFD and routing protocols.
Option D: If a BFD session flaps, master/backup switchovers are frequently performed... set the WTR time.
* Correct (True Statement).
* The WTR (Wait to Restore) timer helps stabilize BFD by delaying session recovery after a flap, reducing the risk of frequent switchovers.
3. Summary:
* The false statement is B, as setting the BFD packet interval to the minimum can destabilize the network.
質問 # 198
When encountering network failures, engineers often use a layered troubleshooting approach. Because all models follow the same basic premise, a model's higher-level structures can only work properly when all of its lower-level structures work properly. Please match the following inspection items with the corresponding levels according to the hierarchical method. Whether the TCP connection is established correctly, whether the port is open, etc., whether the interface protocol is UP, whether layer 2 addressing is normal, etc., whether the physical status of the interface, cables and connectors, etc. are UP, etc., whether the routing protocol is working normally, etc.
正解：
解説：
質問 # 199
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