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Huawei H12-831_V1.0 (HCIP-Datacom-Advanced Routing & Switching Technology V1.0) Exam is a certification that focuses on advanced networking and switching technology. HCIP-Datacom-Advanced Routing & Switching Technology V1.0 certification is designed for IT professionals who want to deepen their understanding of data communication, routing, and switching. It is recommended for network engineers, network administrators, and network architects who want to enhance their skills and knowledge in managing enterprise-level networks.
NEW QUESTION # 101
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?
Answer: C,D
Explanation:
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).
NEW QUESTION # 102
The debug output information of an OSPF router is shown in the figure. Which of the following is the router ID of this router?
Answer: D
NEW QUESTION # 103
On the IS-IS IPv6 network shown in the figure:
* Multi-topology is enabled on all routers.
* The IPv6 address of Loopback0 on R4 is 2000::4/128.
* The command ipv6 summary 2000::/64 level-2 is configured in the IS-IS processes of R2 and R1.
* The command ipv6 import-route isis level-2 into level-1 is configured in the IS-IS processes of R1, R2, and R3.
Which of the following routers have the route 2000::/64 in their routing tables?
Answer: A,C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the IS-IS Network and IPv6 Route Summary Behavior
* IS-IS Areas and Router Roles:
* Area 49.0001 (Level-1-2): R1, R2, R4
* Area 49.0002 (Level-1-2 & Level-1): R3 (Level-1-2), R5 (Level-1 only)
* Effect of ipv6 summary 2000::/64 level-2 Command
* This command on R1 and R2 summarizes the 2000::/64 prefix for Level-2 routers.
* Instead of advertising the detailed 2000::4/128 prefix, R1 and R2 advertise only the summarized
2000::/64 route to other Level-2 routers.
* Effect of ipv6 import-route isis level-2 into level-1 Command
* This command allows Level-1 routers (like R3) to learn Level-2 routes (like 2000::/64).
* R1 and R2 redistribute the 2000::/64 summary route into Level-1 IS-IS areas, making it available to Level-1 routers.
Route Distribution Analysis for Each Router
R4 (Does Not Have 2000::/64) #
* R4 only advertises its Loopback0 (2000::4/128).
* It does not need to install the summarized 2000::/64 route, as it originates from its own loopback.
# R4 does NOT have the 2000::/64 route.
R5 (Does Not Have 2000::/64) #
* R5 is a Level-1-only router in Area 49.0002.
* It does not have a Level-2 connection to learn the summarized 2000::/64 route.
* Because R5 is Level-1 only, it can only receive routes if a default route is provided, which is not mentioned in the question.
# R5 does NOT have the 2000::/64 route.
R3 (Has 2000::/64) #
* R3 is a Level-1-2 router, meaning it can learn both Level-1 and Level-2 routes.
* Since R1 and R2 advertise the summarized 2000::/64 route into Level-2 and R3 has ipv6 import-route isis level-2 into level-1, R3 will install 2000::/64 in its routing table.
# R3 has the 2000::/64 route.
R2 (Has 2000::/64) #
* R2 is a Level-1-2 router and has the ipv6 summary 2000::/64 level-2 command enabled.
* This means R2 advertises the summarized 2000::/64 route to other Level-2 routers and installs it in its own routing table.
# R2 has the 2000::/64 route.
Final Conclusion:
# R3 has the route 2000::/64.
# R2 has the route 2000::/64.
# R4 does NOT have the route 2000::/64.
# R5 does NOT have the route 2000::/64.
Thus, the correct answers are: C. R3, D. R2.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - IS-IS Route Summarization and IPv6 Multi-Topology Huawei Official HCIP-Datacom Study Guide - IS-IS L1/L2 Routing and IPv6 Summarization Commands Huawei Documentation on IPv6 Route Summary Behavior in IS-IS
NEW QUESTION # 104
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: B,D
NEW QUESTION # 105
An enterprise network is shown in the figure. If CE2 is dual-owned by PE2 and PE3, a Type 5 LSA routing loop may occur. The loop can be prevented by setting the route-tag command on PE2 and PE3 devices. When the Route Tag of the route received by PE3 is the same as the local configuration, the route will be ignored.
Answer: A
NEW QUESTION # 106
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