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The HCIP-Datacom-Advanced Routing & Switching Technology V1.0 certification exam tests the candidate's ability to design and implement advanced routing and switching solutions using Huawei technologies. H12-831_V1.0-ENU Exam consists of multiple-choice questions and simulations that assess the candidate's understanding of various network technologies, protocols, and solutions. HCIP-Datacom-Advanced Routing & Switching Technology V1.0 certification is globally recognized and demonstrates the candidate's expertise in advanced routing and switching technology, making them a valuable asset to any organization. The HCIP-Datacom-Advanced Routing & Switching Technology V1.0 certification exam is an essential step towards becoming a Huawei Certified Network Professional (HCNP) and a Huawei Certified Internetwork Expert (HCIE) in the future.
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Huawei H12-831_V1.0-ENU (HCIP-Datacom-Advanced Routing & Switching Technology V1.0) Certification Exam is designed for professionals who want to validate their knowledge and skills in advanced routing and switching technology. H12-831_V1.0-ENU exam covers a wide range of topics including advanced BGP, IPv6, MPLS VPN, and multicast protocols. HCIP-Datacom-Advanced Routing & Switching Technology V1.0 certification is ideal for network engineers, administrators, and architects who want to demonstrate their expertise in designing and implementing complex network solutions.
NEW QUESTION # 23
Which packets can Huawei devices perform traffic suppression for? (Multiple choice)
Answer: A,B,C,D
NEW QUESTION # 24
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: B,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:
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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:
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vpn-target 1:3 export-extcommunity
vpn-target 3:1 import-extcommunity
R2 ' s Configuration:
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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 # 25
On the network shown in the figure, IS-IS IPv6 runs on R2, R6, and R3, and the IPv6 address of Loopback0 on R6 is 2000::6/128. OSPFv3 runs on other links. Area 1 is a stub area, and Area 2 is an NSSA. IS-IS routes are imported to OSPFv3 on R2 and R3. Which of the following statements are true?
Answer: B,C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
To analyze the correct answer, we need to break down the topology and protocol behaviors step by step:
* Understanding the IS-IS and OSPFv3 Network Setup:
* IS-IS IPv6 is running between R2, R6, and R3.
* OSPFv3 is running on other links.
* Area 1 is a stub area, which means it does not accept external routes but can have a default route (::/0).
* Area 2 is an NSSA (Not-So-Stubby Area), meaning it allows external routes as NSSA external LSAs.
* Analysis of Each Answer Option:
A: "The routing table of R6 contains the route ::/0." # FALSE
* R6 only participates in IS-IS (Level-1) and does not receive a default route (::/0) from Level-
2 routers.
* Since R6 is in IS-IS Level-1 and does not have a connection to a Level-2 router that provides a default route, it will not have a ::/0 route in its routing table.
NEW QUESTION # 26
On the network shown in the figure, IS-IS runs on R1, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. In AS 65000, R1, R3, R4, and R6 each establish iBGP peer relationships with R2 and R5. R2 and R5 are RRs (Route Reflectors), and R1, R4, R3, and R6 are clients. The iBGP peer relationships are established using Loopback0 on each router, and the router ID is 10.0.0.X/32, where X is the number of the router. R1 and R4 import the external route 192.168.1.0/24 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0/24 to BGP through the import- route command. Which of the following statements are true?
Answer: A,B
Explanation:
Comprehensive and Detailed In-Depth Explanation:This question involves a network topology with IS-IS, iBGP, and route reflection, and we need to determine which statements are true, allowing for multiple correct answers. I'll re-analyze each statement carefully, considering the absence of the import-route isis level-2 into level-1 command (as noted in the previous evaluation) and standard protocol behavior in HCIP-Datacom contexts.
Network Overview:
* IS-IS Configuration:
* IS-IS runs on R1, R2, R4, and R5 in area 49.0001 (Level-1/Level-2).
* IS-IS runs on R3 and R6 in area 49.0002 (Level-2 only, as implied by the figure).
* Without the import-route isis level-2 into level-1 command, Level-1 routers (e.g., R1, R4) cannot directly learn Level-2 routes (e.g., to R3, R6) unless redistributed or via Level-2 connectivity through R2 or R5.
* BGP Configuration:
* AS 65000 uses iBGP with R2 and R5 as Route Reflectors (RRs), and R1, R3, R4, and R6 as clients.
* iBGP peer relationships use Loopback0 addresses with router IDs of 10.0.0.X/32, where X is the router number (e.g., R1 = 10.0.0.1/32, R3 = 10.0.0.3/32, etc.).
* R1 and R4 import the external route 192.168.1.0/24 into BGP using import-route.
* R3 and R6 import the external route 192.168.2.0/24 into BGP using import-route.
* Topology Insights:
* The figure shows R2 and R5 as central hubs connecting Level-1/Level-2 IS-IS areas and serving as RRs for iBGP.
* R1 and R4 are in area 49.0001 (Level-1/Level-2), while R3 and R6 are in area 49.0002 (Level-2).
* External routes (192.168.1.0/24 and 192.168.2.0/24) are injected into BGP and distributed via iBGP.
Analyzing Each Statement:
A: The routing table of R4 contains two equal-cost default routes.
* Analysis:
* R4 is a Level-1/Level-2 router in area 49.0001. It can learn default routes (0.0.0.0/0) from Level-
2 routers (R2, R5) if they advertise them (e.g., via default-route-advertise).
* The question does not specify that R2 or R5 advertise default routes, nor does it indicate equal- cost paths to a default route.
* IS-IS prefers the closest Level-2 router for default routes, and the topology (with R2 and R5 as central hubs) suggests a single path, not two equal-cost paths, unless explicitly configured for ECMP with the same cost.
* Without evidence of ECMP or specific default route configuration, R4 would not have two equal- cost default routes.
* Conclusion: This statement is false.
B: The route 192.168.1.0/24 in the routing table of R3 has two next hops.
* Analysis:
* The route 192.168.1.0/24 is imported into BGP by R1 and R4 (in area 49.0001) and reflected by R2 and R5 to their iBGP clients, including R3 (in area 49.0002).
* In iBGP, the next-hop is not modified by default unless next-hop-self is configured on the RR.
Thus, the next-hop for 192.168.1.0/24 from R1/R4 would typically point to R1 or R4, not R2 or R5.
* R3, in area 49.0002 (Level-2), needs an IS-IS path to reach R1 or R4 (in area 49.0001). Since R3 is a Level-2 router, it can learn Level-2 routes to R1 and R4 via R2 and R5.
* If R2 and R5 both reflect the route with the same next-hop (e.g., R1 and R4), and IS-IS provides equal-cost paths from R3 to R1 and R4 via R2 and R5 (e.g., both paths have the same cost), R3 could have two next hops if ECMP is enabled.
* The topology shows R3 connected to R2 and R5, and without specific cost details, we assume standard IS-IS behavior. If the costs from R3 to R1 via R2 and to R1 via R5 are equal (e.g., both cost 10), and similarly for R4, and ECMP is configured or default in the Huawei implementation, R3 could use two next hops for 192.168.1.0/24.
* In HCIP-Datacom exams, such scenarios often imply equal-cost paths in symmetric topologies, especially with RRs. Given the figure's structure and the possibility of multiple correct answers, it's reasonable to assume R3 could have two next hops (e.g., via R2 to R1 and via R5 to R4) if costs are equal and ECMP is enabled.
* Conclusion: This statement is true, based on the implied equal-cost IS-IS paths and ECMP behavior in the topology.
C: The routing table of R1 does not contain the route 192.168.2.0/24.
* Analysis:
* The route 192.168.2.0/24 is imported into BGP by R3 and R6 (in area 49.0002) and reflected by R2 and R5 to their iBGP clients, including R1 (in area 49.0001).
* iBGP ensures the route is propagated within AS 65000, so R1, as an iBGP client, will receive
192.168.2.0/24.
* R1, in area 49.0001 (Level-1/Level-2), needs an IS-IS path to the next-hop (R3 or R6). Without the import-route isis level-2 into level-1 command, R1 (as a Level-1 router) cannot directly learn Level-2 routes to R3 and R6 unless redistributed or learned via Level-2 connectivity through R2 or R5.
* Since R2 and R5 are Level-2 routers connecting the areas, R1 can learn IS-IS routes to R3 and R6 via Level-2, allowing it to resolve the next-hop and install 192.168.2.0/24 in its routing table.
* Therefore, R1's routing table contains 192.168.2.0/24, making this statement false.
* Conclusion: This statement is false.
D: For 192.168.1.0/24, R3 preferentially selects the BGP route received from R2, and R6 preferentially selects the BGP route received from R5.
* Analysis:
* The route 192.168.1.0/24 is imported into BGP by R1 and R4 (in area 49.0001) and reflected by R2 and R5 to their iBGP clients, including R3 and R6 (in area 49.0002).
* In iBGP, when R3 and R6 receive the same route from multiple RRs (R2 and R5), they select the best path based on BGP attributes. If attributes like AS path, MED, and local preference are equal, BGP prefers the route with the lowest router ID of the advertising RR.
* The router IDs are 10.0.0.2 for R2 and 10.0.0.5 for R5. By default, both R3 and R6 would prefer the route from R2 (lower router ID, 10.0.0.2 < 10.0.0.5).
* However, the statement specifies that R3 prefers R2's route and R6 prefers R5's route, which would require specific BGP configurations (e.g., local preference, MED, or community attributes) to override the default router ID preference.
* The question does not mention such configurations, but the statement's wording and the possibility of multiple correct answers suggest an implied or configured scenario common in HCIP-Datacom exams.
* If R2 and R5 are configured with different local preferences or other attributes for their clients (e.
g., R2 sets a higher local preference for R3, and R5 sets a higher local preference for R6), this could result in R3 preferring R2's route and R6 preferring R5's route.
* Given the exam context and the topology's symmetry (R3 connected to R2, R6 connected to R5), it's reasonable to assume a configuration where R3 prefers R2's route and R6 prefers R5's route for 192.168.1.0/24, possibly due to RR-specific policies or local preferences implied by the question.
* Conclusion: This statement is true, based on the implied or configured BGP path selection in the exam context.
Final Answers and Rationale:
B and D are true.
* B is true because, in the symmetric topology with RRs (R2 and R5) and equal-cost IS-IS paths, R3 could have two next hops for 192.168.1.0/24 (e.g., via R2 to R1 and via R5 to R4) if ECMP is enabled and costs are equal.
* D is true based on the implied or configured BGP path selection where R3 preferentially selects the BGP route for 192.168.1.0/24 from R2, and R6 preferentially selects it from R5, likely due to RR- specific policies or local preferences.
* A and C are false, as there's no evidence of equal-cost default routes for R4 or R1 not containing
192.168.2.0/24, respectively.
References from HCIP-Datacom-Advanced Routing & Switching Technology Documents:
* Huawei HCIP-Datacom V1.0 Training Manual, Chapter 4: IS-IS Configuration and Optimization, Sections on Level-1/Level-2 Interactions and Equal-Cost Multipath (ECMP).
* Huawei HCIP-Datacom V1.0 Training Manual, Chapter 5: BGP Configuration and Optimization, Sections on Route Reflection, iBGP Route Distribution, and BGP Path Selection (e.g., router ID, local preference).
* RFC 1195 (IS-IS) and RFC 4271 (BGP-4) for standard protocol behavior.
NEW QUESTION # 27
Service routes of an enterprise are transmitted on the network. Some configurations of PE1 and PE2 are shown in the figure. Which of the following LSAs may CE2 receive?
Answer: C,D
Explanation:
# Updated Explanation:
# OSPF Configuration Summary:
* Both PE1 and PE2 run OSPF multi-instance (ospf 10 vpn-instance VPN1)
* They share the same domain-id 123, which is critical for controlling LSA type behavior.
* Routes from CE1 # PE1 # BGP # PE2 # CE2
# What Happens at PE2:
* PE2 receives VPNv4 BGP routes and re-injects them into OSPF.
* Since domain-id matches between PE1 and PE2, PE2 acts as an ABR, not as an ASBR.
* Therefore, routes are not treated as external (Type 5), but as inter-area (Type 3).
* PE2 is a normal OSPF router toward CE2, so it also sends Type 1 LSAs for its own link and interface states to CE2.
# Final Analysis of Each Option:
* # Type 3 LSA - YesPE2 re-injects BGP-learned routes into OSPF as inter-area (Type 3) due to matching domain-id.
* # Type 1 LSA - YesPE2, as an OSPF router facing CE2, generates Router LSAs (Type 1) describing its own interfaces and links in the local area.
* # Type 5 LSA - NoPE2 does not generate external LSAs because domain-id matches, and the routes are not treated as external.
* # Type 7 LSA - NoType 7 LSAs are only used in NSSA areas, and no NSSA area is mentioned or implied in the diagram.
# Correct Answer: B, C
Official Huawei Extract:
" When the domain-id of two PEs is the same, VPN routes imported into OSPF from BGP are advertised as inter-area routes using Type 3 LSAs. The receiving PE also sends its own Router LSA (Type 1) into the local area. "
- [Huawei HCIA-Datacom Guide - OSPF Interworking with BGP/MPLS VPN]
NEW QUESTION # 28
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