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Huawei H12-831_V1.0-ENU（HCIP-Datacom-Advanced Routing＆Switching Technology v1.0）認定試験は、Huaweiが提供する専門レベルの認定試験です。この認定試験は、高度なルーティングとスイッチングテクノロジーの候補者の知識とスキルをテストするように設計されています。この試験は、複雑なネットワークインフラストラクチャの設計、実装、および管理を担当するネットワークエンジニアと管理者を対象としています。
Huawei H12-831_V1.0-ENU（HCIP-Datacom-Advanced Routing＆Switching Technology V1.0）試験は、高度なルーティングおよびスイッチング技術に焦点を当てた認定試験です。この試験は、Huawei Datacom製品およびソリューションを扱うITプロフェッショナルの知識とスキルをテストするように設計されています。この試験に合格することで、Huawei製品および技術を使用して複雑なデータコムネットワークを設計、展開、管理する個人の能力が証明されます。
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質問 # 203
On the OSPFv3 network shown in the figure:
* OSPFv3 is enabled on the interfaces connecting R1, R2, and R3.
* The router ID of each router is 10.0.X.X, where X is the number of the router.
* If you check detailed information about an LSA on R3, the command output shows that the LSA is generated by R2 and describes the IPv6 prefix address associated with the Router-LSA.
Is this statement TRUE or FALSE?
正解：B
解説：
Comprehensive and Detailed In-Depth Explanation:
Understanding the LSA Table in the Figure
The LSA Type displayed in the LSDB of R3 is an Intra-Area-Prefix-LSA (Type 9), with the following attributes:
* LS Type: Intra-Area-Prefix-LSA (Type 9)
* Link State ID: 0.0.0.1
* Originating Router: 10.0.2.2 (R2)
* Referenced LSA Type: 0x2001 (Router-LSA, Type 1)
* Referenced Link State ID: 0.0.0.0
* Referenced Originating Router: 10.0.2.2 (R2)
* Prefix: 2000:2::/128
Analysis of the Statement
* What is an Intra-Area-Prefix-LSA (Type 9)?
* Used in OSPFv3 to advertise IPv6 prefixes associated with a Router-LSA (Type 1) or Network- LSA (Type 2).
* Each router generates its own Router-LSA (Type 1) and references it in an Intra-Area-Prefix- LSA (Type 9).
* How does this apply to R3 ' s LSDB?
* The LSA is generated by R2 (10.0.2.2), meaning R2 originated the prefix advertisement.
* The referenced LSA is a Router-LSA, indicating that the IPv6 prefix is associated with R2 ' s router advertisement.
* Since R3 sees this LSA in its LSDB, it means R2 has advertised its IPv6 prefix (2000:2::/128) into the OSPFv3 domain.
# Since the LSA describes an IPv6 prefix associated with R2's Router-LSA, the statement is TRUE.
Final Conclusion:
# The LSA is generated by R2 and describes the IPv6 prefix associated with the Router-LSA.
# Thus, the correct answer is: A. TRUE.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPFv3 LSA Types and IPv6 Prefix Advertisement Huawei Official HCIP-Datacom Study Guide - OSPFv3 Intra-Area-Prefix-LSA and Router-LSA Relationship Huawei Documentation on OSPFv3 LSAs and Neighbor Advertisement
質問 # 204
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.
* R1 adds a community attribute (1:1) to the route before advertising it to its peers.
* All routers are configured to propagate community attributes.
* R3 is configured with a routing policy that rejects routes with the community attribute 1:1.
In this case, which of the following is the path for traffic from R3 to 192.168.1.0/24?
正解：A
解説：
Comprehensive and Detailed In-Depth Explanation:
Understanding the BGP Network Topology in the Question:
* BGP Peering & Route Distribution
* Each router forms EBGP peer relationships with directly connected neighbors.
* R1 and R4 import the static route 192.168.1.0/24 into BGP and advertise it to their peers.
* Community attributes are attached to routes to influence routing policies.
* Effect of Community Attribute 1:1
* R1 marks 192.168.1.0/24 with community 1:1 before advertising it.
* R3 has a policy that rejects any routes with community attribute 1:1.
* Since R1's advertisement contains 1:1, R3 will not accept 192.168.1.0/24 from R2.
Route Selection and Traffic Flow Analysis:
* R1 advertises 192.168.1.0/24 with community 1:1 to R2.
* R3 rejects this route from R2 because of the configured routing policy.
* R4 also advertises 192.168.1.0/24 to its EBGP neighbors without community 1:1.
* R5 learns the route from R4 and advertises it to R3.
* Since R5's advertisement does not include community 1:1, R3 accepts the route from R5.
* 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 # R2 # R4 (Incorrect)
* R3 does not learn the route from R2 because it rejects community 1:1.
* Since R1 added 1:1, and R2 propagated the same community, R3 will not accept this path.
# Option B: R3 does not have a route to 192.168.1.0/24 (Incorrect)
* R3 does have a route, but it learns it from R5 instead of R2.
# Option C: R3 # R2 # R1 (Incorrect)
* R1 marked the route with 1:1, and R2 advertised it with the same community.
* Since R3 rejects 1:1 routes, it will not use this path.
# Option D: R3 # R5 # R1 (Correct)
* R5 learns the route from R4, which does not have community 1:1, and advertises it to R3.
* R3 accepts this route and forwards traffic to R5, which sends it to R1.
Final Conclusion:
# D. The correct path for traffic from R3 to 192.168.1.0/24 is R3 # R5 # R1.
Thus, the correct answer is: D.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - BGP Route Filtering and Community Attribute Configuration Huawei Official HCIP-Datacom Study Guide - BGP Best Path Selection and Community-Based Routing Policies Huawei Documentation on BGP Community Attributes and Route Filtering
質問 # 205
Regarding multi-instance CE (Mlulti-VPN-Instance CE, MCE), which of the following descriptions is wrong?
正解：B
質問 # 206
Regarding BGP/MPLS IPVPN data forwarding, which of the following descriptions is wrong?
正解：A
質問 # 207
On a BGP/MPLS IP VPN network, PEs can use BGP-4 to advertise VPNv4 routes to each other.
正解：A
解説：
Traditional BGP-4 was designed primarily to advertise IPv4 unicast routing information between autonomous systems.
However, BGP/MPLS IP VPN networks require additional capabilities to transport VPN-specific route information, including Route Distinguishers, Route Targets, and VPN labels.
Multiprotocol BGP (MP-BGP) provides these capabilities by extending BGP through attributes such as MP_REACH_NLRI and MP_UNREACH_NLRI.
MP-BGP supports VPNv4 address families, enabling Provider Edge routers to exchange customer VPN routes while preserving routing separation between VPN instances.
The VPNv4 address family combines a 64-bit RD with a 32-bit IPv4 address, forming a 96-bit VPNv4 address.
Therefore, ordinary BGP-4 IPv4 unicast route advertisements are insufficient for exchanging VPNv4 routing information.
The statement is FALSE because VPNv4 route exchange requires MP-BGP capabilities rather than conventional BGP-4 IPv4 unicast advertisement.
質問 # 208
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