OSPF is deployed on a campus network to implement network interconnection. An engineer configures R2 as shown in the figure. Which of the following statements is incorrect about LSAs on the OSPF network?
Correct Answer: A
# Analyze the Configuration: [R2] acl 2000 [R2-acl-basic-2000] rule deny [R2] ospf [R2-ospf-1] area 1 [R2-ospf-1-area-0.0.0.1] filter 2000 import [R2-ospf-1-area-0.0.0.1] quit [R2-ospf-1] default-route-advertise always # Understanding Key Concepts: Type 3 LSAs (Inter-Area Routes): Generated by ABRs to advertisesummary routesbetween areas. Filtering Type 3 LSAsis possible using import filters (like in Area 1). Type 5 LSAs (External Routes): Flooded only within the same ASbutdo not enter stub or NSSA areas. #Breakdown of the Options: A). Type 5 LSAs are flooded in Area 1##Incorrect If Area 1 is astub or NSSA, thenType 5 LSAs are not allowed. Although the diagram does not explicitly say Area 1 is a stub/NSSA,real deployments often use stub areas at the edge (like Area 1). More importantly,the filter is applied to Area 1, and there isno redistributionof external routes into Area 1 in the config. Therefore, Type 5 LSAs wouldnot be floodedthere. B). Type 3 LSAs are not flooded in Area 1##Correct The command filter 2000 import with ACL rule deny meansType 3 LSAs are filtered from Area 0 into Area 1. C). Type 3 LSAs are not flooded in Area 2##Correct There isno filter applied to Area 2, so thiscould be false,butsince the question asks for the incorrect statement, this is not the answer. D). Type 5 LSAs are flooded in Area 2##Correct Area 2 is not shown to be stub or NSSA, and there's no filter or restriction configured. Hence,Type 5 LSAs are allowedandflooded in Area 2. #Correct answer: A. Type 5 LSAs are flooded in Area 1. Reference:Huawei HCIE-Datacom V1.0 Study GuideChapter:OSPF Advanced ConfigurationSection:LSA Types and Filtering (Type 3 and Type 5)
Question 72
As shown in the figure, PE1 establishes an EVPN peer relationship with each of PE2 and PE3. When the network is initialized, CE1 sends an ARP request packet. Which of the following statements are correct about how a PE processes the packet?
Correct Answer: A,B,D
Understanding EVPN (Ethernet VPN) and ARP Request Handling #What is EVPN? EVPN (Ethernet VPN) is aBGP-based control plane for VXLANthat improvesLayer 2 & Layer 3 network scalability. Eliminatesflood-and-learn behaviorusingBGP MAC/IP advertisement routes. #Why is an ARP Request Sent? WhenCE1 (192.168.1.1/24) wants to communicate with CE2 (192.168.1.2/24), it sends anARP requestto discover the MAC address of CE2. #How Does EVPN Process the ARP Request? 1##PE1 receives the ARP request from CE1. 2##PE1 sends a MAC/IP advertisement route (Type 2 EVPN route) to inform PE2 and PE3 of CE1's MAC address. 3##PE1 forwards the ARP request as BUM (Broadcast, Unknown unicast, and Multicast) traffic to PE2 and PE3. 4##PE3 (Designated Forwarder - DF) forwards the packet to CE2. 5##PE2 (Non-DF) does NOT forward the packet to avoid loops. Analysis of the Answer Choices: #A. When forwarding the packet to PE3, PE1 needs to add the BUM traffic label allocated by PE3 to the packet. Correct: BUM (Broadcast, Unknown Unicast, Multicast) traffic in EVPNis encapsulated with aspecial labelassigned by the receiving PE. PE1adds the BUM traffic label for PE3before sending the ARP request. #B. PE1 sends a MAC/IP advertisement route carrying the MAC address of CE1. Correct: EVPN Type 2 MAC/IP advertisement routesare sent to inform other PEs of CE1's MAC/IP binding. #C. PE2 forwards the packet to CE1. Incorrect: PE2 is the Non-Designated Forwarder (Non-DF)anddoes NOT forward BUM trafficto avoid loops. #D. PE3 forwards the packet to CE1. Correct: PE3 is the Designated Forwarder (DF) for this segment, meaning itforwards the ARP request to CE2. #Reference:Huawei HCIE-Datacom Guide - EVPN BGP MAC/IP Advertisement and BUM Traffic Handling Real-World Application: Data Center Interconnect (DCI):EVPN prevents excessiveARP floodingacross VXLAN networks. Enterprise Campus Networks:UsesEVPN VXLAN to scale Layer 2 connectivity across multiple locations.
Question 73
The telemetry network model is broadly and narrowly defined. Which of the following modules are involved in telemetry in a narrow sense (device-side telemetry)?
Correct Answer: A,B,C
Comprehensive and Detailed In-Depth Telemetry in a narrow sense refers specifically to the device-side telemetry process, which includes the following key modules: Data generation (A): The device collects and generates telemetry data, such as performance metrics or operational statistics. Data push (B): The device actively pushes the collected data to the configured destination (such as a collector or management system) using a data streaming protocol. Data source (C): The entity on the device that generates or provides the monitored data. Data subscription (D) is not part of the device-side telemetry; it is related to the management system side, where users subscribe to specific telemetry data streams. Therefore, the correct answers are A, B, C. Reference: Huawei HCIE Datacom Official Certification Guide Huawei Telemetry Configuration Guide
Question 74
By default, routers running IS-IS in broadcast networks have a period of seconds for DIS to send CSNP packets?
Correct Answer: A
Question 75
IS-IS supports multi-instance and multi-process. Which of the following statements are correct about IS-IS multi-instance and multi-process?
Correct Answer: B,D
IS-IS Multi-Process: Huawei devices support runningmultiple IS-IS processes simultaneously. These processes arecompletely independentof one another: different LSDBs, interfaces, routing tables, etc. Each process can be associated with aseparate VPN instance, and asingle VPN instance can be served by multiple IS-IS processes. IS-IS Multi-Instance: One IS-IS process canrun multiple instances, typically used formulti-VPN scenarios. However, Huawei ' s current implementation prefersone VPN per processfor clarity and control. Based on Huawei's design: Ais incorrect - an IS-IS processcanserve multiple VPNs in other vendors, but Huawei typically uses one process per VPN for clean separation. Bis correct - a VPN instance can be associated withmultiple IS-IS processes. Cis incorrect in Huawei implementation context. Dis correct -IS-IS processes are independent. Correct answers: B, D Reference:Huawei HCIE-Datacom V1.0 Study Guide -Chapter: IS-IS Advanced FeaturesSection: Multi- process and VPN Association
