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| Section | Weight | Objectives |
|---|---|---|
| Network Troubleshooting | 10% | - Troubleshooting routing and switching issues - Fault diagnosis and analysis methods |
| Advanced IGP Features | 17% | - IS-IS advanced features and convergence - IGP route selection and control - OSPF advanced features and optimization |
| Network Cutover and Migration | 7% | - Service switchover and verification - Migration strategies and risk control |
| Advanced Ethernet Technologies | 10% | - Ethernet OAM and protection mechanisms - Advanced link aggregation and reliability - VLAN stacking and QinQ |
| Advanced BGP Features | 10% | - BGP path control and filtering - BGP route attributes and policies - Route reflectors and confederations |
| Network O&M | 7% | - Network monitoring and management tools - Performance optimization and capacity planning |
| MPLS Technologies | 19% | - MPLS basics and label distribution - MPLS VPN and traffic engineering - MPLS protection and fast reroute |
| IPv6 Routing | 20% | - BGP4+ and IPv6 route deployment - OSPFv3 and IS-IS for IPv6 - IPv6 addressing and transition technologies |
>> H12-831_V1.0 PDF Question <<
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NEW QUESTION # 197
In OSPF, the A, BR will convert all type 7 L SAs in the NSSA area to type 5 L SAs.
Answer: A
NEW QUESTION # 198
On the IS-IS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. Which of the following statements is false?
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the IS-IS Topology in the Question:
* R1 (Level-1 Router) is connected to R2 (Level-1-2 Router).
* R2 connects Level-1 and Level-2 areas, making it an inter-area router.
* R3 (Level-2 Router) connects to R2.
* The loopback addresses are:
* R1: 10.0.1.1/32
* R2: 10.0.2.2/32
* R3: 10.0.3.3/32
Key Command Used: default-route-advertise always level-1
* This command forces R1 to advertise a default route (0.0.0.0/0) to Level-1 routers.
* Level-1 routers (like R1) do not have visibility into Level-2 routes unless a default route is provided by an L1-L2 router (R2 in this case).
Analyzing Each Option:
* Option A (TRUE):
* If R1 pings an unknown address like 10.0.4.4, it will use the default route if available.
However, if no such route exists, it will not send any packets.
* This behavior is expected, so this statement is true.
* Option B (TRUE):
* 10.0.2.2 (R2) is a Level-1-2 router, and it can communicate with 10.0.3.3 (R3), which is a Level-2 router.
* Since R2 and R3 are both in Level-2, they can exchange routes.
* So, 10.0.2.2 can ping 10.0.3.3. This statement is true.
* Option C (TRUE):
* 10.0.1.1 (R1) is a Level-1 router, and 10.0.2.2 (R2) is a Level-1-2 router.
* Since R2 is Level-1-2, it shares Level-1 routes with R1, allowing communication between R1 (10.0.1.1) and R2 (10.0.2.2).
* Therefore, this statement is true.
* Option D (FALSE - Correct Answer):
* 10.0.1.1 (R1) is a Level-1 router, which means it only knows about Level-1 routes.
* 10.0.3.3 (R3) is a Level-2 router, and its route is only known by Level-2 routers (R2 & R3).
* Since Level-1 routers do not learn Level-2 routes directly (unless specific redistribution is done), R1 does not have a route to 10.0.3.3.
* Therefore, R1 (10.0.1.1) cannot ping R3 (10.0.3.3), making this statement false.
Conclusion:
The false statement is Option D (10.0.1.1 can ping 10.0.3.3).
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - IS-IS Route Types and Forwarding Principles Huawei Official HCIP-Datacom Study Guide - IS-IS Level-1 and Level-2 Routing Concepts Huawei Documentation on default-route-advertise always level-1 Command
NEW QUESTION # 199
On a PIM-SM multicast network, a network engineer finds that multicast clients cannot receive multicast dat a. Which of the following is not a possible cause of this problem?
Answer: A
NEW QUESTION # 200
On the OSPFv3 network shown in the figure, area 1 is a stub area. Which of the following statements are true?
Answer: A,B
NEW QUESTION # 201
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?
Answer: A,B
Explanation:
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
NEW QUESTION # 202
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