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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Cutover and Migration | 7% | - Migration strategies and risk control - Service switchover and verification |
| Topic 2: Network Troubleshooting | 10% | - Fault diagnosis and analysis methods - Troubleshooting routing and switching issues |
| Topic 3: MPLS Technologies | 19% | - MPLS VPN and traffic engineering - MPLS basics and label distribution - MPLS protection and fast reroute |
| Topic 4: Advanced IGP Features | 17% | - OSPF advanced features and optimization - IGP route selection and control - IS-IS advanced features and convergence |
| Topic 5: Network O&M | 7% | - Network monitoring and management tools - Performance optimization and capacity planning |
| Topic 6: Advanced BGP Features | 10% | - BGP path control and filtering - BGP route attributes and policies - Route reflectors and confederations |
| Topic 7: Advanced Ethernet Technologies | 10% | - Ethernet OAM and protection mechanisms - VLAN stacking and QinQ - Advanced link aggregation and reliability |
| Topic 8: IPv6 Routing | 20% | - IPv6 addressing and transition technologies - OSPFv3 and IS-IS for IPv6 - BGP4+ and IPv6 route deployment |
>> H12-831_V1.0-ENU Latest Exam Questions <<
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NEW QUESTION # 108
On the OSPFv3 network shown in the figure, area 1 is a stub area .
Which of the following LSAs is generated by only one router ?
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding OSPFv3 LSA Types
* OSPFv3 uses different LSA types than OSPFv2 , with some being similar in function:
* Link-LSA (Type 8): Generated by every router on a link to advertise link-local IPv6 information.
* Intra-Area-Prefix-LSA (Type 9): Advertises IPv6 prefixes within an area.
* Network-LSA (Type 2): Generated only by the Designated Router (DR) to advertise information about all routers on a multi-access network.
* Inter-Area-Prefix-LSA (Type 3): Advertises network prefixes between OSPF areas (generated by ABRs).
Route Distribution Analysis:
A). Inter-Area-Prefix-LSA (Type 3) # (Incorrect)
* Generated by an ABR to advertise prefixes between OSPF areas.
* More than one ABR can generate this LSA.
# Not always generated by only one router.
B). Link-LSA (Type 8) # (Incorrect)
* Each router generates its own Link-LSA for each link it participates in.
* This means multiple routers can generate this LSA.
# Not generated by only one router.
C). Network-LSA (Type 2) # (Correct)
* Generated ONLY by the Designated Router (DR) on a multi-access network (such as an Ethernet link).
* Other routers do not generate this LSA, only the DR does.
# Correct answer: This LSA is generated by only one router (the DR).
D). Intra-Area-Prefix-LSA (Type 9) # (Incorrect)
* Generated by any router to advertise IPv6 prefixes within an area.
* Multiple routers in an area can generate this LSA.
# Not generated by only one router.
Final Conclusion:
# C. Network-LSA (Type 2) is the correct answer because it is generated by only one router-the Designated Router (DR).
Thus, the correct answer is: C. Network-LSA .
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPFv3 LSA Types and Multi-Area Behavior Huawei Official HCIP-Datacom Study Guide - OSPFv3 Stub Areas and LSA Advertisements Huawei Documentation on OSPFv3 DR/BDR Roles and LSA Generation
NEW QUESTION # 109
In order to prevent traffic flooding caused by broadcast storm, the administrator plans to deploy traffic suppression function in the inbound direction of the device interface view. Which of the following parameters can be used to suppress broadcast packets? (Multiple choice)
Answer: A,C,D
NEW QUESTION # 110
Use "display ospfv3 peer verbose" to view OSPFv3 neighbor information. In the output information, you can see the peer's Router ID, the global unicast address of the peer's interface, the neighbor's status, and other content.
Answer: A
NEW QUESTION # 111
On an enterprise network shown in the figure, if CE2 is dual-homed to PE2 and PE3 , a routing loop may occur during the exchange of Type 5 LSAs (External LSAs in OSPF) .
To prevent the loop, the route-tag command can be run on PE2 and PE3 .
In this way, if the route tag of the route received by PE3 is the same as that configured locally, the route is ignored.
Is this statement True or False?
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding the Issue of OSPF Type 5 LSAs in a Dual-Homed CE Scenario
* OSPF Type 5 LSAs (External LSAs) are used in OSPF to advertise external routes , such as those learned via BGP or redistributed from another protocol.
* In a dual-homed CE setup , like the one in the figure, CE2 connects to both PE2 and PE3 using OSPF.
* PE2 and PE3 both redistribute BGP routes into OSPF and advertise them to CE2.
* CE2 then forwards these LSAs between PE2 and PE3 , potentially causing a routing loop because each PE may re-learn its own previously advertised routes.
2. How Route Tags Prevent Loops in OSPF-BGP Redistribution
* The route-tag command assigns a tag to redistributed routes.
* When a router receives an external OSPF LSA (Type 5), it checks the route tag.
* If the route tag matches the locally configured tag, the router ignores the route to prevent loops.
Example Configuration on PE Routers:
plaintext
CopyEdit
PE2:
router ospf 1
import-route bgp 100 route-tag 65001
PE3:
router ospf 1
import-route bgp 100 route-tag 65001
* Both PE2 and PE3 tag their redistributed BGP routes with 65001.
* If PE3 receives an LSA from CE2 with the tag 65001, it ignores it (because it knows it originally advertised it).
# This prevents OSPF from incorrectly preferring a route that was originally sourced from itself, avoiding routing loops.
3. Evaluating the Answer Choices
# TRUE: If the route tag of the received route matches the locally configured tag, the route is ignored, preventing loops.
# FALSE: The statement is correct, so False is incorrect.
Thus, the correct answer is: A. TRUE
Final Conclusion:
# The statement is TRUE because route tagging is a valid method to prevent OSPF Type 5 LSA loops in dual-homed scenarios.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF Route Redistribution and Route-Tagging Huawei Official HCIP-Datacom Study Guide - Preventing OSPF-BGP Loops in MPLS VPNs Huawei Documentation on Using Route Tags to Prevent OSPF Routing Loops
NEW QUESTION # 112
Regarding BGP/MPLS IPVPN routing interaction, which of the following descriptions is wrong?
Answer: A
NEW QUESTION # 113
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