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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Cutover | 7% | - Migration process - Basic cutover concepts |
| Topic 2: Advanced BGP Features | 10% | - Advanced BGP features - Route reflectors - BGP route control - Inter-domain routing optimization |
| Topic 3: MPLS Technologies | 19% | - MPLS configuration - MPLS principles - MPLS VPN applications - MPLS forwarding |
| Topic 4: Network Troubleshooting | 10% | - Structured troubleshooting processes - Troubleshooting methods |
| Topic 5: Advanced IGP Features | 17% | - OSPF advanced features - IS-IS advanced features - Fast convergence - Route control |
| Topic 6: Advanced Ethernet Technologies | 10% | - VLANs - Ethernet security |
| Topic 7: IPv6 Routing | 20% | - IPv6 static routes - OSPFv3 - BGP4+ - IS-IS for IPv6 |
| Topic 8: Network O&M | 7% | - Data collection - Routine maintenance |
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NEW QUESTION # 171
On the OSPF network shown in the figure, drag the values on the left to the correct positions so that:
* Traffic from PC1 to PC2 follows the path:PC1 - > R1 - > R3 - > R2 - > PC2
* Traffic from PC2 to PC1 follows the path:PC2 - > R2 - > R1 - > PC1
Which of the following OSPF cost values should be assigned to Cost-A, Cost-B, and Cost-C to achieve this routing behavior?
Answer:
Explanation:
Explanation:
* A = 50
* B = 10
* C = 20
Comprehensive and Detailed In-Depth Explanation:
Understanding OSPF Path Selection and Cost Calculation:
* OSPF selects the shortest path (lowest cost) to the destination.
* The OSPF cost is determined by the cumulative sum of interface costs along a path.
* By assigning specific costs to A, B, and C, we can influence OSPF's path selection to meet the desired routing behavior.
Step-by-Step Analysis of Required Traffic Flow:
1. Traffic from PC1 to PC2 must take the route:
PC1 - > R1 - > R3 - > R2 - > PC2
* To force traffic through R3, the cost of the direct link R1 - > R2 (Cost-A) must be higher than the alternative path via R3.
* We assign Cost-A = 50 (high cost) to discourage direct routing from R1 - > R2.
* The cost of R1 - > R3 (Cost-C) should be lower, so we assign Cost-C = 20.
* The cost of R3 - > R2 (default Cost-20) remains unchanged.
* Total cost via R3: 20 (R1- > R3) + 20 (R3- > R2) = 40, which is less than the direct link of 50, so OSPF prefers this path.
# Traffic follows: PC1 - > R1 - > R3 - > R2 - > PC2
2. Traffic from PC2 to PC1 must take the route:
PC2 - > R2 - > R1 - > PC1
* We need to make R2 - > R1 (Cost-B) the best (lowest cost) route for return traffic.
* Assign Cost-B = 10 (low cost).
* This ensures that R2 prefers the direct path R2 - > R1 instead of R2 - > R3 - > R1 (which costs
20+20=40).
# Traffic follows: PC2 - > R2 - > R1 - > PC1
Final Cost Assignments for Correct Routing Behavior:
Cost
Assigned Value
Reason
Cost-A (R1 - > R2)
50
High to discourage direct R1- > R2 routing
Cost-B (R2 - > R1)
10
Low to ensure PC2- > PC1 prefers direct R2- > R1
Cost-C (R1 - > R3)
20
Medium to encourage R1- > R3- > R2 path
Key Takeaways:
* Higher OSPF cost discourages path selection.
* Lower OSPF cost encourages path selection.
* By manipulating OSPF cost values, we achieve asymmetric routing between PC1 and PC2.
* This aligns with OSPF path selection principles covered in HCIP-Datacom certification.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Huawei HCIP-Datacom Official Certification Guide, Chapter on OSPF Cost Calculation and Path Selection.
* Huawei Enterprise Networking Training Materials, OSPF Path Optimization Techniques.
* Huawei Datacom Configuration Guide, OSPF Cost and Traffic Engineering.
NEW QUESTION # 172
On the network shown in the figure, IS-IS IPv6 runs on R2, R6, and R3 , and the IPv6 address of Loopback0 on R6 is 2000::6/128 . OSPFv3 runs on other links. Area 1 is a stub area, and Area 2 is an NSSA . IS-IS routes are imported to OSPFv3 on R2 and R3 . Which of the following statements are false?
Answer: B,C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
To determine which statements are false , we need to understand how OSPFv3 and IS-IS work together , and how Inter-Area-Router LSAs (Type 3 LSAs) are generated in OSPF:
1. Understanding OSPF Inter-Area LSAs (Type 3)
* OSPF generates Type 3 LSAs (Inter-Area-Prefix LSAs) to advertise networks between areas.
* Only Area Border Routers (ABRs) generate Inter-Area LSAs.
* Type 3 LSAs allow routes to be advertised from one OSPF area to another (e.g., from Area 0 to Area 1 or Area 2).
2. Analysis of Each Answer Option:
# A. " R3 generates an Inter-Area-Router-LSA in Area 0. " # TRUE
* R3 is an ABR (connecting IS-IS and OSPF Area 0).
* Since R3 is importing IS-IS routes into OSPFv3 , it must generate Type 3 LSAs to advertise those routes in Area 0 .
* This statement is correct.
# B. " R2 generates an Inter-Area-Router-LSA in Area 0. " # TRUE
* R2 is also an ABR (connecting IS-IS and OSPF Area 0).
* Like R3, R2 imports IS-IS routes into OSPFv3 and advertises them into Area 0 using Type 3 LSAs.
* This statement is correct.
# C. " R1 generates an Inter-Area-Router-LSA in Area 2. " # FALSE
* R1 is not an ABR.
* Only ABRs generate Type 3 LSAs, and R1 is not an ABR between Area 2 and Area 0.
* This statement is false.
# D. " R2 generates an Inter-Area-Router-LSA in Area 1. " # FALSE
* Area 1 is a stub area, and stub areas do not allow Inter-Area-Router LSAs (Type 3 LSAs) for external routes.
* R2 does not generate Inter-Area LSAs in Area 1 because OSPF prevents this in stub areas.
* This statement is false.
NEW QUESTION # 173
On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces. The AS number is 6500X, where X is the number of the router. Both Rl and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import-route command.
By default, in the routing table of R3, which of the following is the AS_Path attribute carried in the route to
192.168.1.0/24?
Answer: D
NEW QUESTION # 174
On an MPLS network, when a transit device receives an MPLS packet and is ready to swap labels, it finds that the label value after swapping is 0.
In this case, which of the following operations will the device perform?
Answer: C
NEW QUESTION # 175
The link state value information between different ISIS processes of multiple routers is considered to be isolated.
Answer: A
NEW QUESTION # 176
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