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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: OSPF Fundamentals | 16% | - OSPF principles and operation mechanisms - OSPF special applications and troubleshooting - OSPF configuration and optimization |
| Topic 2: IPv6 Technologies | 3% | - IPv6 routing protocols - IPv6 address structure and configuration |
| Topic 3: IS-IS Fundamentals | 8% | - IS-IS configuration and deployment - IS-IS protocol principles |
| Topic 4: BGP Fundamentals | 17% | - BGP configuration and policy application - BGP route attributes and selection - BGP characteristics and working principles |
| Topic 5: Ethernet Switching Technologies | 7% | - VLAN principles and configuration - Link aggregation and stack technology - Spanning Tree Protocol |
| Topic 6: WLAN Basics | 2% | - WLAN technology principles - WLAN deployment and optimization |
| Topic 7: Network Service and Management | 5% | - DHCP and DNS services - Network management and monitoring |
| Topic 8: Routing and Traffic Control | 10% | - Route import and redistribution - Policy-based routing - Routing policy and filtering |
| Topic 9: Network Solutions and Design | 5% | - Typical network architecture and solution - Enterprise network design principles |
| Topic 10: Routing Basics | 3% | - Routing table composition and selection rules - Routing concepts and classification |
| Topic 11: Network Security | 8% | - Attack defense and security policy - ACL and packet filtering - AAA authentication |
| Topic 12: Network Reliability | 7% | - Device redundancy and link backup - VRRP protocol - BFD technology |
| Topic 13: Multicast Technologies | 9% | - PIM protocol - Multicast basic concepts - IGMP protocol |
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問題 #256
On an OSPF network, if two directly connected routers with the same router ID run in the same area, the master/slave relationship cannot be determined for DD packets.
答案：B
問題 #257
On a broadcast IS-IS network, a DIS needs to be elected to create and update pseudonodes. Which of the following values is the default DIS priority of an IS-IS interface?
答案：A
解題說明：
Comprehensive and Detailed in-depth Step-by-Step Explanation:In an Intermediate System to Intermediate System (IS-IS) network, a Designated Intermediate System (DIS) is elected on broadcast networks to perform the following functions:
* Represent the broadcast network as a pseudonode.
* Generate and update the Link State Protocol Data Units (LSPs) for the pseudonode.
The DIS is elected based on the DIS priority value, which is configured on IS-IS interfaces. If two routers have the same priority, the router with the higher MAC address becomes the DIS.
The default DIS priority for IS-IS interfaces is 64, which can be modified depending on the network requirements.
* Option A (200): Incorrect. This is not the default value.
* Option B (64): Correct. This is the default DIS priority value.
* Option C (1): Incorrect. This is not the default value.
* Option D (100): Incorrect. This is not the default value.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "IS-IS Basics".
* RFC 1195 - Use of OSI IS-IS for Routing in TCP/IP and Dual Environments.
問題 #258
Which of the following descriptions about the duplicate address detection function of NDP is wrong?
答案：A
問題 #259
Which of the following descriptions about URPF (Unicast Reverse Path Forwarding) is correct?
答案：D
問題 #260
BGP can select routes based on the AS_Path attribute. Therefore, in some cases, a route-policy needs to be used to modify the AS_Path attribute for route selection. Which of the following parameters can be specified in the apply as-path command for a route-policy to modify this attribute?
答案：B,C,D
解題說明：
Comprehensive and Detailed Step-by-Step Explanation:
1. Overview of AS_Path Attribute Modification:
The apply as-path command in a route-policy is used to modify the AS_Path attribute of routes. This is often required to influence the selection of routes or to adjust routing policies for incoming or outgoing BGP updates.
2. Parameters of the apply as-path Command:
Option A: Delete
* Correct.
* The delete parameter removes specific AS numbers from the AS_Path attribute. This is used to simplify or manipulate the AS_Path for specific routing policies.
Option B: Additive
* Correct.
* The additive parameter appends an AS number to the existing AS_Path attribute, instead of overwriting it. This is useful when you want to prepend AS numbers to influence route selection without removing the original AS_Path.
Option C: Copy
* Incorrect.
* The copy parameter is not supported in the apply as-path command for modifying AS_Path attributes.
Option D: Overwrite
* Correct.
* The overwrite parameter replaces the existing AS_Path with a new one. This provides complete control over the AS_Path attribute but removes the original AS_Path entirely.
3. Summary:
The valid parameters for the apply as-path command are delete, additive, and overwrite.
問題 #261
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