H12-831_V1.0 Lernhilfe - H12-831_V1.0 Deutsche Prüfungsfragen

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Huawei H12-831_V1.0 Exam Syllabus Topics:

Section	Weight	Objectives
Advanced IGP Features	17%	- IS-IS advanced optimisations - OSPF advanced capabilities
Advanced BGP Features	10%	- BGP policy controls - Route reflector and attributes
Troubleshooting	10%	- Issue resolution strategies - Network diagnostics
Advanced Ethernet Technologies	10%	- VLAN and Ethernet enhancements - MAC/security features
Network O&M	7%	- Monitoring and health metrics - Operation & maintenance best practices
Network Cutover	7%	- Migration planning techniques - Rollback procedures
MPLS Technologies	19%	- MPLS VPN basics - MPLS LDP and TE
IPv6 Routing	20%	- OSPFv3/IS-IS for IPv6 - IPv6 static and dynamic routing

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Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 H12-831_V1.0 Prüfungsfragen mit Lösungen (Q66-Q71):

66. Frage
On the OSPF network shown in the figure, the cost values of links are marked, and OSPF IP FRR is enabled on R1. Which of the following statements are true?

A. No backup path can be established between R1 and 10.0.3.3/32.
B. If BFD (with default detection parameters) is enabled on the entire network and the link between R2 and SI is disconnected, R1 can quickly detect the OSPF adjacency fault.
C. If SI is powered off, R1 directly uses the backup path to forward packets to R3.
D. If the link between R1 and SI is disconnected, R1 directly uses the backup path to forward packets to R3.

Antwort: B,C,D

67. Frage
A network engineer provides a troubleshooting report after rectifying a fault. The actual network is simplified into the one shown in the figure, where R1 and R2 both have OSPF enabled, and function as the gateways of PCI and PC2, respectively. Given this, which of the following statements is false?

A. The router LSA generated by R1 contains information with the link ID being 192.168.1.0.
B. PC1 and PC2 cannot ping each other.
C. R1 cannot ping 192.168.1.2.
D. The OSPF routing table of R1 contains a route to 192.168.1.0/24.

Antwort: C

68. Frage
About the difference between NSR and NSF, which is correct?

A. NSFCan be done without neighbor routers
B. NSRMust rely on neighbor routers to complete
C. NSRandNSFBy6Requires neighbor router to complete
D. NSFMust rely on neighbor routers to complete

Antwort: D

69. Frage
BGP allows you to use the filter-policy acl-number import command to filter received routes. The value of ad- number ranges from 2000 to 3999.

A. FALSE
B. TRUE

Antwort: B

70. Frage
On the OSPFv3 network shown in the figure, area 1 is an NSSA. R1 imports the external route 2000::1/128 to OSPFv3. Which of the following LSAs are available in area 0?

A. Inter-Area-Router-LSA
B. Link-LSA
C. Intra-Area-Prefix-LSA
D. Inter-Area-Prefix-LSA

Antwort: A,D

Begründung:
Comprehensive and Detailed In-Depth Explanation:To determine which LSAs are available in Area 0, we need to analyze the OSPFv3 network, the area types, and the behavior of external routes in an NSSA, considering the possibility of multiple correct answers. Let's break it down step by step:
* Understanding the Network and Area Types:
* The network has two areas: Area 0 (backbone area) and Area 1 (Not-So-Stubby Area or NSSA).
* R1, located in Area 1, imports an external IPv6 route (2000::1/128) into OSPFv3.
* Area 0 is the backbone area, and Area 1 is an NSSA, which allows limited external routes but has specific restrictions on LSA types.
* OSPFv3 LSA Types and Their Roles:
* Link-LSA (Type 8): These are link-local LSAs, flooded only within the local link and not propagated beyond the local segment. They are not flooded into Area 0 or other areas, so they are not relevant for inter-area or external route advertisement.
* Inter-Area-Router-LSA (Type 4): These LSAs are used to describe routers in other areas, specifically Autonomous System Boundary Routers (ASBRs) that originate external routes. In this case, R1 is an ASBR in Area 1 (NSSA) importing the external route 2000::1/128. Type 4 LSAs are generated by the ABR (e.g., R1 or another router connecting Area 1 to Area 0) and flooded into Area 0 to provide reachability information to the ASBR (R1) for the external route.
Therefore, Inter-Area-Router-LSAs can be present in Area 0 to help routers reach R1 as the ASBR.
* Intra-Area-Prefix-LSA (Type 9): These LSAs advertise prefixes associated with routers or transit networks within the same area. They are not used for external routes and are confined to Area 1, so they are not available in Area 0.
* Inter-Area-Prefix-LSA (Type 3): These LSAs advertise prefixes from one area to another, including routes summarized or redistributed into the OSPF domain. In an NSSA, external routes (like 2000::1/128) are advertised as Type 7 LSAs within Area 1. The ABR (e.g., R1 or another router) translates these Type 7 LSAs into Type 5 LSAs or, in OSPFv3, they may be represented as Inter-Area-Prefix-LSAs (Type 3) to flood the external route into Area 0. Thus, Inter-Area- Prefix-LSAs are available in Area 0 for the external route 2000::1/128.
* Behavior of External Routes in an NSSA:
* In OSPFv3, an NSSA (like Area 1) allows external routes to be imported by an ASBR (R1 in this case). NSSAs do not flood Type 5 LSAs (external LSAs) directly into the area. Instead, external routes are advertised as Type 7 LSAs within the NSSA.
* The Area Border Router (ABR) connecting the NSSA (Area 1) to the backbone (Area 0)-likely R1 or another router-translates the Type 7 LSAs into Type 5 LSAs (or, in OSPFv3, they may be represented as Inter-Area-Prefix-LSAs or other appropriate LSAs for external routes). These translated LSAs are then flooded into Area 0.
* Additionally, since R1 is an ASBR, Area 0 needs to know how to reach R1 to access the external route 2000::1/128. This is achieved through Inter-Area-Router-LSAs (Type 4), which are flooded into Area 0 by the ABR to describe the location of the ASBR (R1) in Area 1.
* Determining LSAs Available in Area 0:
* Link-LSA (Type 8): These are link-local and not flooded into Area 0, so they are not available in Area 0.
* Inter-Area-Router-LSA (Type 4): Since R1 is an ASBR in Area 1 (NSSA) importing the external route, the ABR (e.g., R1 or another router) generates Inter-Area-Router-LSAs to advertise R1's location to Area 0. This LSA is necessary for routers in Area 0 to reach the ASBR (R1) for the external route 2000::1/128. Therefore, Inter-Area-Router-LSAs are available in Area
0.
* Intra-Area-Prefix-LSA (Type 9): These are confined to Area 1 and not flooded into Area 0, so they are not available in Area 0.
* Inter-Area-Prefix-LSA (Type 3): This LSA is used to advertise the external prefix 2000::1/128 into Area 0 after translation from Type 7 LSAs in Area 1. Therefore, Inter-Area-Prefix-LSAs are available in Area 0.
* Conclusion:
* The external route 2000::1/128, imported by R1 in Area 1 (NSSA), results in both Inter-Area- Router-LSAs (Type 4) and Inter-Area-Prefix-LSAs (Type 3) being available in Area 0.
* Inter-Area-Router-LSA (Type 4) is present to describe the location of the ASBR (R1) in Area 1, allowing routers in Area 0 to reach R1 for the external route.
* Inter-Area-Prefix-LSA (Type 3) is present to advertise the external prefix 2000::1/128 into Area 0 after translation from the Type 7 LSA in Area 1.
* Therefore, the correct answers are B (Inter-Area-Router-LSA) and D (Inter-Area-Prefix-LSA).
References (Based on HCIP-Datacom-Advanced Routing & Switching Technology Concepts):
* OSPFv3 LSA Types: HCIP-Datacom documentation on OSPFv3 LSAs, including Link-LSA, Inter- Area-Router-LSA, Intra-Area-Prefix-LSA, and Inter-Area-Prefix-LSA (e.g., Section on OSPFv3 Fundamentals).
* NSSA Behavior in OSPFv3: HCIP-Datacom coverage of NSSA areas, Type 7 LSAs, and their translation to Type 5 or Inter-Area-Prefix-LSAs for Area 0, as well as Inter-Area-Router-LSAs for ASBR reachability (e.g., Chapter on OSPFv3 Advanced Features and Area Types).
* External Route Propagation: HCIP-Datacom explanation of external route handling in OSPFv3, including ASBR and ABR roles, and LSA types for inter-area and external route advertisement (e.g., Section on Route Redistribution and IPv6 OSPF).

71. Frage
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