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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Troubleshooting | 10% | - Routing protocol fault diagnosis - Performance and service fault resolution - Structured troubleshooting methodology - Switching and link fault handling |
| Topic 2: Advanced BGP Features | 10% | - Routing policies and filtering - Route reflectors and confederations - BGP multi-homing and load balancing - BGP route selection and attributes |
| Topic 3: Network O&M | 7% | - Routine maintenance procedures - Log and alarm management - Configuration management and backup - Network monitoring and performance analysis |
| Topic 4: Network Cutover | 7% | - Cutover planning and risk assessment - Implementation and rollback strategy - Post-cutover validation - Pre-cutover verification |
| Topic 5: IPv6 Routing | 20% | - BGP4+ for IPv6 - Transition mechanisms (dual-stack, tunnel, translation) - IPv6 address planning and configuration - OSPFv3 and IS-IS for IPv6 |
| Topic 6: Advanced Ethernet Technologies | 10% | - VLAN aggregation and MUX VLAN - Ethernet link aggregation and reliability - QinQ and VLAN mapping - Port isolation and security features |
| Topic 7: Advanced IGP Features | 17% | - IS-IS advanced features
|
| Topic 8: MPLS Technologies | 19% | - MPLS fundamentals and label distribution - LDP and RSVP-TE protocols - MPLS OAM and protection - MPLS VPN (L3VPN, L2VPN) |
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241. Frage
On the OSPFv3 network shown in the figure:
* Area 1 is a stub area, Area 2 is a common area, and Area 3 is an NSSA (Not-So-Stubby Area).
* The IPv6 address of Loopback0 on R6 is 2000::6/128.
* The router ID of each router is 10.0.X.X, where X is the router number.
* The stub no-summary command is configured in Area 1 on R2 .
Which of the following statements is true ?
Antwort: A
Begründung:
Comprehensive and Detailed In-Depth Explanation:
Understanding OSPFv3 Areas and Routing Behavior
* OSPFv3 Area Types in the Network:
* Area 1 (Stub Area): Does not accept external LSAs (Type 5) but can receive Inter-Area-Prefix- LSAs (Type 3).
* Area 2 (Common Area): Fully functional area that allows both Type 3 (Inter-Area) and Type 5 (External) LSAs.
* Area 3 (NSSA - Not-So-Stubby Area): Does not accept Type 5 (External) LSAs but allows ASBRs to inject external routes using Type 7 LSAs, which are later converted to Type 5 in other areas.
* Effect of stub no-summary Command on Area 1 (Configured on R2):
* This command prevents Type 3 LSAs from entering Area 1 , meaning R4 will not learn about
2000::6/128 from other areas.
* R4 only has a default route (::/0) provided by R2 but not individual routes like 2000::6/128 .
Route and Packet Flow Analysis
A). " The LSDB of R4 contains the Inter-Area-Prefix-LSA that is generated by R1 and describes 2000::6
/128. " # (False)
* R4 is in Area 1 (a totally stub area), which does not receive Type 3 LSAs.
* Since 2000::6/128 is an external route from Area 2, it will not be present in R4's LSDB.
* Thus, R4 does NOT have the Inter-Area-Prefix-LSA for 2000::6/128.
# Statement A is incorrect.
B). " The path for data packets from R4 to 2000::6 is R4 - > R1 - > R5 - > R3 - > R6. " # (False)
* R4 is in a totally stub area (Area 1), and it does not have a specific route for 2000::6/128 .
* It only has a default route (::/0) pointing to R2 .
* If R4 forwards traffic, it will send it to R2, NOT via R1, R5, and R3.
# Statement B is incorrect.
C). " The routing table of R4 does not contain the route 2000::6/128. " # (True - Correct Answer)
* R4 is in a totally stub area (Area 1), meaning it only receives a default route from R2 (::/0).
* It does NOT receive specific routes like 2000::6/128.
# Statement C is correct.
D). " The path for data packets from R4 to 2000::6 is R4 - > R2 - > R6. " # (False)
* While R4 does forward all unknown traffic to R2 (due to the default route), R2 will NOT directly forward to R6.
* R2 is an ABR (Area Border Router), and the actual path to 2000::6 must traverse Area 2, likely through other routers.
# Statement D is incorrect.
Final Conclusion:
# C. The routing table of R4 does not contain the route 2000::6/128.
Thus, the correct answer is: C. The routing table of R4 does not contain the route 2000::6/128.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPFv3 Area Types (Stub, NSSA, Common) Huawei Official HCIP-Datacom Study Guide - OSPFv3 LSAs and Routing Table Analysis Huawei Documentation on Stub Area Behavior with stub no-summary Configuration
242. Frage
As shown in the figure, private network routing information is exchanged between PE1 and PE2 and their respective CEs through OSPF, and the same DomainlD is set on both PE1 and PE2. When routes are imported from BGP to OSPF on PE2, it is possible that Which of the following types of SAs are passed to CE2?
Antwort: B,C,D
243. Frage
In the OSPFv3 network shown in the figure, the interconnected ports of R1, R2, and R3 have OSPFv3 enabled, and the Router ID of each device is 10.0.XX, where X is the device number.
Check the detailed information of a certain LSA on R3. From the output information, it can be inferred that the LSA is generated by R2, and it describes the IPv6 prefix address associated with the Network-LSA.
Antwort: B
244. Frage
The normal operation environment of the equipment is the prerequisite for ensuring the normal operation of the equipment. When checking the equipment operation environment, which of the following items need to be checked? (Multiple choice)
Antwort: A,B,D
245. Frage 
On the OSPF network shown in the figure, the cost values of links are marked. OSPF IP FRR is enabled on R1, and the maximum load-balancing 8 command is configured in the OSPF process. Which of the following is the cost value of the route 10.0.35.0/24 in the routing table of R1?
Antwort: D
Begründung:
Comprehensive and Detailed In-Depth Explanation:
To determine the cost value of the route 10.0.35.0/24 in the routing table of R1, let's analyze the possible shortest paths from R1 to R3 (which owns the 10.0.35.0/24 network) based on the given OSPF link costs:
* Path 1: R1 # R2 # R3
* R1 to R2: Cost = 20
* R2 to R3: Cost = 10
* Total Cost = 20 + 10 = 30
* Path 2: R1 # R4 # R3
* R1 to R4: Cost = 10
* R4 to R3: Cost = 10
* Total Cost = 10 + 10 = 20 # (Lowest cost path)
* Path 3: R1 # R5 # R3
* R1 to R5: Cost = 10
* R5 to R3: Cost = 10
* Total Cost = 10 + 10 = 20 # (Equal-cost path)
Final Calculation:
* The two best equal-cost paths (R1 # R4 # R3 and R1 # R5 # R3) have a cost of 20.
* Since OSPF supports equal-cost multi-path (ECMP) routing and maximum load-balancing 8 is enabled, OSPF will install both routes into the routing table with the same cost of 20.
* The path R1 # R2 # R3 has a higher cost (30) and will not be chosen.
Final answer: # 20 (Option C)
References:
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF Route Calculation & Load Balancing
* OSPF Equal-Cost Multi-Path (ECMP) and Route Selection
* OSPF Fast Reroute (FRR) Mechanism
246. Frage
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