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質問 # 93
On the OSPF network shown in the figure, area 1 is an NSSA, area 2 is a common area, and R4 imports an external route 10.0.4.4/32. The router ID of each router is 10.0.X.X, where X is the router number. If the asbr-summary 10.0.4.0 255.255.255.0 command is run in the OSPF processes of R1 and R3, which of the following routers have the route 10.0.4.0/24 in their routing tables?
正解：B、D
解説：
Step 1: Understanding OSPF Areas and Summarization
* Area 1 (NSSA - Not So Stubby Area)
* Allows external routes but converts Type-5 LSAs into Type-7 LSAs.
* External routes must be translated by an ABR into Type-5 LSAs before being propagated into other areas.
* Area 2 (Common Area - Regular OSPF Area)
* Supports both inter-area and external routes.
* asbr-summary 10.0.4.0 255.255.255.0 Command
* This command summarizes all external routes within 10.0.4.0/24 into a single summarized route.
* Since it is applied on R1 and R3, these routers will advertise 10.0.4.0/24 instead of 10.0.4.4/32 to their respective areas.
Step 2: Route Distribution Analysis
* R4 (Originating Router in NSSA - Area 1)
* R4 injects 10.0.4.4/32 as a Type-7 LSA into Area 1.
* R1 (ABR between Area 1 & Area 0, Summarizing Route)
* Since R1 is an ABR, it translates Type-7 LSAs from Area 1 into a summarized Type-5 LSA (10.0.4.0/24) for Area 0.
* # R1 has 10.0.4.0/24 in its routing table.
* R2 (Inside Backbone Area 0, No ASBR Summary Applied Here)
* R2 only receives Type-5 LSAs from R1 but does not summarize them.
* Since R2 is not explicitly summarizing, it will likely still see 10.0.4.4/32 rather than 10.0.4.0
/24.
* # R2 does not have 10.0.4.0/24.
* R3 (ABR between Area 0 & Area 2, Summarizing Route)
* R3 is also an ABR and has the asbr-summary 10.0.4.0/24 command configured.
* It will advertise the summarized route 10.0.4.0/24 into Area 2.
* # R3 has 10.0.4.0/24 in its routing table.
* R5 (Inside Area 2, No Direct Connectivity to External Routes)
* Since R3 summarizes 10.0.4.0/24, R5 (inside Area 2) will receive only summarized routes.
* # R5 has 10.0.4.0/24.
Final answer: # R1, R3 (Option A, C)
References:
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF Route Summarization
* OSPF NSSA and Type-7 to Type-5 LSA Translation
質問 # 94
Configure ipv6 preference in IS-IS protocol view. The function of this command is to configure the preference of IPv6 routes generated by lS-Is protocol.
正解：A
質問 # 95
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?
正解：A、C
解説：
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).
質問 # 96
A campus has deployed IPv6 for service testing. In the early stage of deployment, engineers wanted to achieve network interoperability through IPv6 static routes. When creating an IPv6 static route. You can specify both the outbound interface and the next hop, or only the outbound interface or only the next hop.
正解：B
質問 # 97
Fill in Blanks
by executing___________The command can completely isolate the second and third layer users of different ports on the same LAN and cannot communicate. (Please use English and lowercase letters to complete the command, and the command cannot be abbreviated)
正解：
解説：
portisolateenable
質問 # 98
......
ブラウジング中の支払いのセキュリティが心配ですか？ H12-831_V1.0-ENUテストトレントは、購入プロセスのセキュリティ、製品のダウンロード、インストールを安全でウイルスのないものにすることができます。この点について疑問がある場合は、専門の担当者がインストールと使用をリモートでガイドします。 H12-831_V1.0-ENUテスト回答の購入プロセスは非常に簡単で、単純な人にとっては大きな恩恵です。H12-831_V1.0-ENU学習教材の合格率は彼らのものよりもはるかに高いことを保証できます。そしてこれが最も重要です。以前のデータによると、H12-831_V1.0-ENUトレーニング質問を使用する人の98％〜99％が試験に合格しました。あなたが私たちに信頼を与えてくれるなら、私たちはあなたに成功を与えます。
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そのため、最高の学習教材を提供するため、HuaweiのH12-831_V1.0-ENU認定を取得する必要があります、Huawei H12-831_V1.0-ENU的中合格問題集 確かに、これは困難な試験です、Huawei H12-831_V1.0-ENU的中合格問題集 紹介を注意深くお読みください、試験に合格したお客様は「H12-831_V1.0-ENUオンラインテストエンジンを利用して、模擬試験を繰り返して受けました、Huawei H12-831_V1.0-ENU的中合格問題集 時間と労力はほとんどかかりません、Huawei H12-831_V1.0-ENU的中合格問題集 そのまま紙にメモを取れますし、重要と思ってるところを印とか色で付けれ、復習を便利になります、Huawei H12-831_V1.0-ENU 的中合格問題集 あなたは実績をあげ、分野でのオフィスワーカーから好評を受けたいですか？
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確かに、これは困難な試験です、紹介を注意深くお読みください、試験に合格したお客様は「H12-831_V1.0-ENUオンラインテストエンジンを利用して、模擬試験を繰り返して受けました、時間と労力はほとんどかかりません。
