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| Certification Vendor: | Huawei |
|---|---|
| Exam Name: | HCIP-Datacom-Advanced Routing & Switching Technology V1.0 |
| Exam Number: | H12-831_V1.0-ENU |
| Certificate Validity Period: | 3 years |
| Passing Score: | 600/1000 |
| Exam Format: | Drag-and-drop, True or false, Short response, Single-answer questions, Multiple-answer questions |
| Exam Price: | USD 180 |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 60 |
| Available Languages: | Chinese, English, Japanese |
| Related Certifications: | HCIP-Datacom-Core Technology V1.0 |
| Recommended Training: | Huawei Official Training |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Huawei H12-831_V1.0-ENU Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE test centers |
| Pre Condition: | Recommended to have HCIA-Datacom certification or equivalent knowledge; pass H12-821 as core exam |
| Official Syllabus URL: | https://e.huawei.com/en/talent/certification/exam/h12-831 |
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Huawei H12-831_V1.0-ENU exam covers a wide range of topics, including advanced routing and switching technologies, network security, VPN technologies, and network optimization. H12-831_V1.0-ENU exam consists of multiple-choice questions, simulations, and practical exercises that test the candidate's ability to apply their knowledge in real-world scenarios. H12-831_V1.0-ENU exam is available in both English and Chinese, and candidates have three hours to complete it.
Huawei H12-831_V1.0-ENU (HCIP-Datacom-Advanced Routing & Switching Technology V1.0) Exam is a certification exam that tests the skills and knowledge of candidates in advanced routing and switching technologies. H12-831_V1.0-ENU Exam is designed for professionals who are seeking to enhance their networking skills and advance their careers in the field of data communication. H12-831_V1.0-ENU exam covers advanced topics such as OSPF, BGP, MPLS, VPN, and IPv6, among others, and is an essential certification for any networking professional.
NEW QUESTION # 57
On the OSPFv3 network shown in the figure, area 1 is a common area. R2 generates an Inter-Area-Prefix- LSA to describe the routes of a network segment in the area. Such an LSA exists in both area 0 and area 1.
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
To determine whether the statement is true or false, we need to analyze the OSPFv3 topology, the role of area types, and the behavior of Inter-Area-Prefix-LSAs. Let's break it down step by step:
* Understanding the OSPFv3 Topology and Area Types :
* The figure shows three routers (R1, R2, and R3) connected in an OSPFv3 network. R1 and R2 are in Area 0 (the backbone area), while R2 and R3 are in Area 1 (a common area, also known as a standard or regular area).
* R2 is an Area Border Router (ABR) because it connects Area 0 and Area 1. ABRs are responsible for summarizing and advertising routes between areas.
* What is a Common Area in OSPFv3? :
* A " common area " in OSPFv3 refers to a standard or regular OSPF area, as opposed to special areas like Stub, Totally Stubby, Not-So-Stubby Area (NSSA), or Totally NSSA. Common areas allow all types of LSAs, including inter-area, intra-area, and external LSAs, to be flooded within the area, except for restrictions in special area types.
* Since Area 1 is described as a " common area, " it behaves like a standard OSPF area, allowing the full exchange of LSAs, including Inter-Area-Prefix-LSAs.
* Role of Inter-Area-Prefix-LSA (Type 3 LSA in OSPFv3) :
* Inter-Area-Prefix-LSAs (Type 3 LSAs in OSPFv3) are used by ABRs to advertise prefixes from one area to another. These LSAs are critical for inter-area routing, allowing routers in one area to learn about networks in other areas.
* In this case, R2, as an ABR, generates Inter-Area-Prefix-LSAs to describe routes (network segments) in Area 1 and advertises them into Area 0. Conversely, R2 also receives Inter-Area- Prefix-LSAs from Area 0 (via R1) and advertises them into Area 1.
* Does the Inter-Area-Prefix-LSA Exist in Both Area 0 and Area 1? :
* Yes, Inter-Area-Prefix-LSAs exist in both areas because R2, as an ABR, floods these LSAs into both Area 0 and Area 1. Specifically:
* R2 generates Inter-Area-Prefix-LSAs for network segments in Area 1 and advertises them into Area 0, where R1 (in Area 0) can receive and process them.
* Similarly, R2 receives Inter-Area-Prefix-LSAs for network segments in Area 0 (from R1) and advertises them into Area 1, where R3 (in Area 1) can receive and process them.
* Since Area 1 is a common area (not a stub or NSSA), it allows Inter-Area-Prefix-LSAs to be flooded within the area, ensuring that routers like R3 can learn about routes in Area 0, and routers like R1 can learn about routes in Area 1.
* Verifying the Statement :
* The statement claims that R2 generates an Inter-Area-Prefix-LSA to describe the routes of a network segment in Area 1, and such an LSA exists in both Area 0 and Area 1. This is accurate because:
* R2, as an ABR, generates Inter-Area-Prefix-LSAs for Area 1's network segments and floods them into Area 0.
* R2 also receives and floods Inter-Area-Prefix-LSAs from Area 0 into Area 1.
* Therefore, Inter-Area-Prefix-LSAs describing routes in Area 1 exist in both Area 0 and Area 1, making the statement true.
* Conclusion :
* The statement is true because Inter-Area-Prefix-LSAs generated by R2 for Area 1's network segments are flooded into both Area 0 and Area 1, and Area 1, being a common area, allows these LSAs to exist within it.
References to HCIP-Datacom-Advanced Routing & Switching Technology Documents :
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0, Section on OSPFv3: OSPF Area Types, Inter-Area Routing, and LSA Types (specifically Inter-Area-Prefix-LSA, Type 3 LSA).
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0, Chapter on OSPF Routing Protocols: ABR Behavior, Common Areas, and LSA Flooding Mechanisms.
NEW QUESTION # 58
On the enterprise network shown in the figure, R3 is connected to the NMS , and all devices on the network communicate with the NMS through a VPN .
During an inspection, it is found that R3 has redundant RTs (Route Targets) .
Which of the following commands can be run on R3 to delete the redundant RTs without affecting the connectivity between all devices and the NMS?
Options:
Answer: C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding VPN Route Targets (RTs) in MPLS VPNs
* Route Targets (RTs) define which VPN routes should be imported and exported among PE routers.
* Import-extcommunity: Specifies which VPN routes should be accepted into a VRF.
* Export-extcommunity: Specifies which VPN routes should be advertised from a VRF.
* Correctly configuring RTs ensures proper route exchange between VPN sites.
2. Analyzing the RTs in the Diagram
R3 ' s Current Configuration:
plaintext
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vpn-target 3:1 export-extcommunity
vpn-target 3:2 export-extcommunity
vpn-target 1:3 export-extcommunity
vpn-target 1:3 import-extcommunity
vpn-target 3:1 import-extcommunity
vpn-target 3:2 import-extcommunity
R1 ' s Configuration:
plaintext
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vpn-target 1:3 export-extcommunity
vpn-target 3:1 import-extcommunity
R2 ' s Configuration:
plaintext
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vpn-target 2:3 export-extcommunity
vpn-target 3:2 import-extcommunity
* R3 has redundant RTs because it both exports and imports unnecessary RTs.
* We need to remove only redundant RTs without affecting NMS connectivity.
3. Evaluating Each Answer Choice
A). " undo vpn-target 3:1 import-extcommunity " ( # Incorrect)
* R1 exports RT 1:3, and R3 imports it as 3:1.
* Removing 3:1 import-extcommunity would block R3 from receiving routes from R1, disrupting connectivity to NMS.
* Thus, this option is incorrect.
B). " undo vpn-target 1:3 export-extcommunity " ( # Correct)
* R3 exports RT 1:3, but there is no need for R3 to advertise routes with 1:3.
* R1 already exports 1:3, and R3 only needs to import it.
* Removing vpn-target 1:3 export-extcommunity does not affect connectivity but eliminates redundancy.
* # This is a correct choice.
C). " undo vpn-target 1:3 import-extcommunity " ( # Incorrect)
* R3 needs to import 1:3 to receive routes from R1 (which is required for NMS communication).
* If removed, R3 will not receive necessary routes, breaking connectivity.
* Thus, this option is incorrect.
D). " undo vpn-target 2:3 export-extcommunity " ( # Correct)
* R2 exports RT 2:3, but R3 does not need to receive it.
* This RT is redundant and can be removed without affecting connectivity.
* # This is a correct choice.
4. Evaluating the Answer Choices
Option
Correct?
Reasoning
A
# Incorrect
R3 must import 3:1 from R1 to maintain connectivity.
B
# Correct
Removing export-extcommunity 1:3 eliminates redundancy without affecting connectivity.
C
# Incorrect
Removing import-extcommunity 1:3 would block R3 from receiving necessary routes.
D
# Correct
Removing export-extcommunity 2:3 eliminates redundancy without affecting connectivity.
# Correct answer: B and D.
Final Conclusion:
* Route Targets (RTs) are used in MPLS VPNs to control route import/export policies.
* R3 has redundant RTs, and removing unnecessary exports (1:3 and 2:3) optimizes configuration.
* Correct commands to remove redundancy without affecting connectivity are:
* # undo vpn-target 1:3 export-extcommunity
* # undo vpn-target 2:3 export-extcommunity
* Thus, the correct answer is: B and D.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - MPLS VPN RT and Route Control Huawei Official HCIP-Datacom Study Guide - Route Targets in MPLS VPNs Huawei Documentation on BGP MPLS VPN RT Configuration
NEW QUESTION # 59
On the OSPFv3 network shown in the figure:
* Area 1 is a stub area
* Area 2 is a common area
* Area 3 is an NSSA
* The IPv6 address of Loopback0 on R6 is 2000::6/128.
* The router ID of each router is 10.0.X.X, where X is the router number.
Which of the following statements are true?
Answer: B,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
To determine the correct answers, we need to analyze OSPFv3 behavior and Inter-Area-Prefix LSAs (Type 3 LSAs).
1. Understanding OSPFv3 Inter-Area-Prefix LSAs (Type 3 LSAs)
* Type 3 LSAs (Inter-Area-Prefix LSAs) are generated by an ABR (Area Border Router) to advertise networks between areas.
* If a router in one area learns a prefix from another area, it generates a Type 3 LSA to advertise it further.
* Stub areas (Area 1) do not allow external LSAs, including Type 3 LSAs for external routes.
* NSSA areas (Area 3) accept external routes but redistribute them as Type 7 LSAs before being converted to Type 5 LSAs by an NSSA ABR.
2. Analyzing Each Answer Option:
# A. " The Inter-Area-Prefix-LSA that is generated by R1 and describes 2000::6/128 exists in Area 0. " # TRUE
* R6 has 2000::6/128 in Area 2.
* R2 is the ABR that brings this prefix into Area 0 as a Type 3 LSA.
* R1, being in Area 0, learns this LSA from R2.
* Thus, this statement is correct.
# B. " The Inter-Area-Prefix-LSA that is generated by R1 and describes 2000::6/128 exists in Area 3. " # FALSE
* R1 is not an ABR for Area 3, so it does not generate an LSA for 2000::6/128 in Area 3.
* Instead, R3 (the ABR between Area 0 and Area 3) would be responsible for propagating routes.
* This statement is false.
# C. " The Inter-Area-Prefix-LSA that is generated by R2 and describes 2000::6/128 exists in Area 1. " # FALSE
* Area 1 is a stub area and does not accept external LSAs (including Type 3 LSAs from other areas).
* R2 cannot generate and send a Type 3 LSA for 2000::6/128 into Area 1.
* This statement is false.
# D. " The Inter-Area-Prefix-LSA that is generated by R3 and describes 2000::6/128 exists in Area 2. " # TRUE
* R3 is an ABR and learns 2000::6/128 from R2 (which originally learned it from R6 in Area 2).
* Since Area 2 is a normal (non-stub, non-NSSA) area, Type 3 LSAs are allowed.
* R3 generates and advertises this Inter-Area-Prefix-LSA for 2000::6/128 into Area 2.
* Thus, this statement is correct.
NEW QUESTION # 60
On the OSPFv3 network shown in the figure:
* Area 1 is a stub area, Area 2 is a common area, and Area 3 is an NSSA (Not-So-Stubby Area).
* The IPv6 address of Loopback0 on R6 is 2000::6/128.
* The router ID of each router is 10.0.X.X, where X is the router number.
* The stub no-summary command is configured in Area 1 on R2.
Which of the following statements is true?
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding OSPFv3 Areas and Routing Behavior
* OSPFv3 Area Types in the Network:
* Area 1 (Stub Area): Does not accept external LSAs (Type 5) but can receive Inter-Area-Prefix- LSAs (Type 3).
* Area 2 (Common Area): Fully functional area that allows both Type 3 (Inter-Area) and Type 5 (External) LSAs.
* Area 3 (NSSA - Not-So-Stubby Area): Does not accept Type 5 (External) LSAs but allows ASBRs to inject external routes using Type 7 LSAs, which are later converted to Type 5 in other areas.
* Effect of stub no-summary Command on Area 1 (Configured on R2):
* This command prevents Type 3 LSAs from entering Area 1, meaning R4 will not learn about
2000::6/128 from other areas.
* R4 only has a default route (::/0) provided by R2 but not individual routes like 2000::6/128.
Route and Packet Flow Analysis
A: "The LSDB of R4 contains the Inter-Area-Prefix-LSA that is generated by R1 and describes 2000::6
/128." # (False)
* R4 is in Area 1 (a totally stub area), which does not receive Type 3 LSAs.
* Since 2000::6/128 is an external route from Area 2, it will not be present in R4's LSDB.
* Thus, R4 does NOT have the Inter-Area-Prefix-LSA for 2000::6/128.
# Statement A is incorrect.
B: "The path for data packets from R4 to 2000::6 is R4 -> R1 -> R5 -> R3 -> R6." # (False)
* R4 is in a totally stub area (Area 1), and it does not have a specific route for 2000::6/128.
* It only has a default route (::/0) pointing to R2.
* If R4 forwards traffic, it will send it to R2, NOT via R1, R5, and R3.
# Statement B is incorrect.
C: "The routing table of R4 does not contain the route 2000::6/128." # (True - Correct Answer)
* R4 is in a totally stub area (Area 1), meaning it only receives a default route from R2 (::/0).
* It does NOT receive specific routes like 2000::6/128.
# Statement C is correct.
D: "The path for data packets from R4 to 2000::6 is R4 -> R2 -> R6." # (False)
* While R4 does forward all unknown traffic to R2 (due to the default route), R2 will NOT directly forward to R6.
* R2 is an ABR (Area Border Router), and the actual path to 2000::6 must traverse Area 2, likely through other routers.
# Statement D is incorrect.
Final Conclusion:
# C. The routing table of R4 does not contain the route 2000::6/128.
Thus, the correct answer is: C. The routing table of R4 does not contain the route 2000::6/128.
NEW QUESTION # 61
As shown in the figure, all routers run OSPF, because R3 is in the backbone area, so in the LSDB of R3 There are no three types of LSAO
Answer: B
NEW QUESTION # 62
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