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Huawei H12-831_V1.0 (HCIP-Datacom-Advanced Routing & Switching Technology V1.0) Exam is a professional certification exam designed for individuals who wish to validate their knowledge and skills in advanced routing and switching technologies. H12-831_V1.0 exam is designed to test the candidate's ability to plan, design, implement, operate, and troubleshoot complex enterprise-level networks using Huawei's routing and switching technologies. H12-831_V1.0 Exam covers a wide range of topics, including advanced routing protocols, switching technologies, MPLS, VPNs, network security, and network optimization.
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To pass the Huawei H12-831_V1.0-ENU exam, candidates are required to have a deep understanding of advanced routing and switching technologies. They must also be familiar with Huawei's network devices and solutions. H12-831_V1.0 Exam consists of 60 questions and has a time limit of 90 minutes. Candidates must achieve a passing score of 600 out of 1000 to earn the HCIP-Datacom-Advanced Routing & Switching Technology certification.
NEW QUESTION # 19
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 does not exist in area 1?
Answer: D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
In OSPFv3, Link State Advertisements (LSAs) are used to describe the network topology and routing information. The behavior of LSAs in different area types, such as Not-So-Stubby Areas (NSSAs), is critical to understanding this question. Let's break it down step by step:
* Understanding Area 1 as an NSSA :
* An NSSA (Not-So-Stubby Area) is a special type of OSPF area that allows the importation of external routes (Type 7 LSAs, also known as NSSA LSAs) while preventing the flooding of AS- External LSAs (Type 5 LSAs) from other areas into the NSSA. This is done to reduce the amount of routing information within the area while still allowing limited external route advertisement.
* In an NSSA, external routes (like the one imported by R1, 2000::1/128) are advertised as Type 7 LSAs within the NSSA and are translated into Type 5 LSAs by the Area Border Router (ABR) when they need to be advertised into other areas (e.g., the backbone area, Area 0). However, Type 5 LSAs (AS-External-LSAs) are not flooded into the NSSA itself.
* Analyzing the LSAs in the Options :
* A. Inter-Area-Prefix-LSA : These LSAs (Type 3 LSAs in OSPFv3) are used to advertise prefixes between areas. In an NSSA, Inter-Area-Prefix-LSAs can exist because they are used by the ABR to summarize and advertise routes from other areas (like Area 0) into Area 1. Therefore, this LSA exists in Area 1.
* B. NSSA LSA : These are Type 7 LSAs in OSPFv3, specific to NSSAs. They are used to advertise external routes (like the 2000::1/128 route imported by R1) within the NSSA. Since Area 1 is an NSSA and R1 is importing an external route, NSSA LSAs exist in Area 1.
* C. Intra-Area-Prefix-LSA : These LSAs (Type 1 and Type 2 LSAs, or their OSPFv3 equivalents) are used to advertise prefixes within the same area. In Area 1, Intra-Area-Prefix- LSAs exist to describe the internal topology and prefixes of Area 1, so this LSA is present.
* D. AS-External-LSA : These are Type 5 LSAs in OSPFv3, used to advertise external routes throughout the OSPF domain (outside the autonomous system). However, in an NSSA, Type 5 LSAs are not flooded into the area to keep it stubby-like. Instead, external routes are advertised as Type 7 LSAs (NSSA LSAs) within the NSSA and are only converted to Type 5 LSAs by the ABR when exiting the NSSA. Therefore, AS-External-LSAs (Type 5 LSAs) do not exist in Area
1.
* Role of R1 and the External Route :
* R1 is importing the external route 2000::1/128 into OSPFv3, which means it acts as an Autonomous System Boundary Router (ASBR) within Area 1. As an ASBR in an NSSA, R1 advertises this external route as a Type 7 LSA (NSSA LSA) within Area 1. This Type 7 LSA is then translated by the ABR (if R1 is not the ABR, or by another ABR in Area 1) into a Type 5 LSA for advertisement into other areas (e.g., Area 0). However, the Type 5 LSA (AS-External- LSA) does not exist within Area 1 itself, as NSSAs block Type 5 LSAs.
* Conclusion :
* Given that Area 1 is an NSSA, and Type 5 LSAs (AS-External-LSAs) are not flooded into NSSAs, the AS-External-LSA does not exist in Area 1. All other LSAs (Inter-Area-Prefix-LSA, NSSA LSA, and Intra-Area-Prefix-LSA) can exist in Area 1 based on the topology and the role of R1 as an ASBR.
Therefore, the correct answer is D, as AS-External-LSAs do not exist in Area 1.
References to HCIP-Datacom-Advanced Routing & Switching Technology Documents :
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0, Section on OSPFv3: OSPF Area Types and LSA Types (specifically NSSA behavior, Type 5 and Type 7 LSAs).
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0, Chapter on OSPF Routing Protocols: LSAs in Different Area Types and External Route Handling.
NEW QUESTION # 20
The figure shows the debugging information on an OSPF router. Which of the following is the router ID of this router?
Answer: D
NEW QUESTION # 21
On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces.
* The router ID of each router is 10.0.X.X, and the AS number is 6500X, where X is the number of the router.
* Both R1 and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import- route command.
* The aggregate 192.168.1.0/16 detail-suppressed command is configured on R2.
Which of the following is the path for traffic from R3 to 192.168.1.0/24?
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the BGP Network Topology in the Question:
* EBGP Peering & Route Distribution
* Each router forms EBGP peer relationships with directly connected neighbors.
* BGP learns and propagates routes via EBGP neighbors.
* R1 and R4 advertise the static route 192.168.1.0/24 into BGP.
* Effect of the aggregate 192.168.1.0/16 detail-suppressed Command on R2
* R2 performs BGP route aggregation, summarizing 192.168.1.0/24 into a larger 192.168.1.0/16 route.
* The detail-suppressed option hides the more specific 192.168.1.0/24 prefix when advertising routes.
* As a result, R2 does not advertise the specific 192.168.1.0/24 route to its neighbors.
Route Selection and Traffic Flow Analysis:
* R1 and R4 originate 192.168.1.0/24 and advertise it via BGP.
* R2 does not advertise the 192.168.1.0/24 route because of the detail-suppressed command.
* R3 cannot learn the specific route from R2, so it must choose an alternative path via R5.
* R5 learns 192.168.1.0/24 from R1 and advertises it to R3.
* Thus, the best available path for R3 to reach 192.168.1.0/24 is R3 # R5 # R1.
# Correct Path: R3 # R5 # R1
Checking Each Option:
# Option A: R3 # R5 # R1 (Correct)
* R3 learns 192.168.1.0/24 from R5, and R5 forwards traffic to R1, which has the static route.
# Option B: R3 # R2 # R1 (Incorrect)
* R2 does not advertise 192.168.1.0/24 due to route summarization (detail-suppressed), so R3 cannot use R2 as the next hop.
# Option C: R3 # R6 # R5 # R1 (Incorrect)
* This is an unnecessary detour.
* R3 has a direct EBGP connection with R5, so it will use the shortest path (R3 # R5 # R1) instead of going through R6.
# Option D: R3 # R5 # R4 (Incorrect)
* R3 prefers the shortest AS path to reach 192.168.1.0/24.
* Since R1 and R4 both advertise the route, R3 will prefer the route via R5 to R1 rather than R4.
Final Conclusion:
# A. The correct path for traffic from R3 to 192.168.1.0/24 is R3 # R5 # R1.
Thus, the correct answer is: A.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - BGP Route Aggregation and Detail Suppression Huawei Official HCIP-Datacom Study Guide - BGP Best Path Selection and Aggregation Rules Huawei Documentation on BGP Route Summarization and Impact on Routing Decisions
NEW QUESTION # 22
As shown in the figure, R1 to R4 are four routers in AS123 . They all run OSPF to implement route reachability within the AS .
* Network segments 10.1.1.0/24 and 10.4.4.0/24 are not advertised into OSPF .
* R1 and R4 establish an IBGP peer relationship using Loopback0 and advertise network segments
10.1.1.0/24 and 10.4.4.0/24 into BGP .
Which of the following methods can be used to implement communication between PC1 and PC2 ?
Options:
Answer: C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding the Routing Issue
* R1 and R4 are BGP routers and have an IBGP connection .
* R2 and R3 are OSPF-only routers (they do not run BGP).
* Networks 10.1.1.0/24 and 10.4.4.0/24 are advertised into BGP but not OSPF.
* PC1 (10.1.1.1) and PC2 (10.4.4.1) need communication , but their networks are not known to OSPF routers R2 and R3 .
To fix this, we need a method that ensures R2 and R3 learn the routes for 10.1.1.0/24 and 10.4.4.0/24 .
2. Evaluating Each Answer Option
* Option A: " Deploy policy-based routing on R1 and specify R2 as the next hop for traffic from PC1 to PC2. "
* Incorrect.
* Policy-Based Routing (PBR) does not solve the issue of missing routes in OSPF.
* Even if R1 forwards traffic to R2, R2 does not know how to reach 10.4.4.0/24 , causing packet drops.
* A proper routing protocol solution is required instead of PBR.
* Option B: " Deploy MPLS and LDP on R1 to R4 and establish LSPs for routes 1.1.1.1/32 and
4.4.4.4/32. "
* Incorrect.
* MPLS requires label-switched paths (LSPs) but does not distribute routing information itself.
* The real problem is that R2 and R3 do not have routing entries for 10.1.1.0/24 and 10.4.4.0/24
.
* MPLS does not fix the missing route advertisement issue.
* Option C: " Run BGP on R2 and R3, and establish full-mesh IBGP connections in AS 123. "
* Correct.
* If R2 and R3 run BGP , they can form IBGP sessions with R1 and R4 and learn routes
10.1.1.0/24 and 10.4.4.0/24 via BGP .
* R2 and R3 would then be able to forward traffic correctly between PC1 and PC2.
* This is a valid method to fix the issue.
* Option D: " On R1 and R4, import routes 10.1.1.0/24 and 10.4.4.0/24 into OSPF. "
* Correct.
* By redistributing BGP routes into OSPF , R1 and R4 can ensure that R2 and R3 learn the missing networks (10.1.1.0/24 and 10.4.4.0/24) via OSPF .
* This allows full reachability without running BGP on R2 and R3.
* This is another valid method to fix the issue.
Final answer:
# C and D are correct.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* BGP and OSPF Route Redistribution
* IBGP Full-Mesh Requirement and Route Propagation
* How Policy-Based Routing Works and Its Limitations
NEW QUESTION # 23
Regarding the BGPI MPLS IPVPN network architecture, which of the following descriptions is wrong?
Answer: A
NEW QUESTION # 24
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