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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: MPLS Technologies | 19% | - MPLS protection and fast reroute - MPLS basics and label distribution - MPLS VPN and traffic engineering |
| Topic 2: Advanced BGP Features | 10% | - BGP path control and filtering - Route reflectors and confederations - BGP route attributes and policies |
| Topic 3: Network Cutover and Migration | 7% | - Migration strategies and risk control - Service switchover and verification |
| Topic 4: Network Troubleshooting | 10% | - Troubleshooting routing and switching issues - Fault diagnosis and analysis methods |
| Topic 5: Network O&M | 7% | - Network monitoring and management tools - Performance optimization and capacity planning |
| Topic 6: Advanced IGP Features | 17% | - OSPF advanced features and optimization - IS-IS advanced features and convergence - IGP route selection and control |
| Topic 7: Advanced Ethernet Technologies | 10% | - VLAN stacking and QinQ - Ethernet OAM and protection mechanisms - Advanced link aggregation and reliability |
| Topic 8: IPv6 Routing | 20% | - BGP4+ and IPv6 route deployment - IPv6 addressing and transition technologies - OSPFv3 and IS-IS for IPv6 |
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NEW QUESTION # 200
In an MPLS network, functions such as neighbor discovery, session establishment and maintenance, and label management are implemented by exchanging LDP messages between SRs running the DP protocol. To ensure the reliability of message delivery, all LDP messages are sent and received based on TCP connections.
Answer: A
NEW QUESTION # 201
As shown in the figure, PE1 and PE2 and their respective CEs exchange private network routing information through OSPF, and the same DomainID is configured on PE1 and PE2. When routes are imported from BGP to OSPF on PE2, which of the following types of SA may be delivered to CE2? (Multiple choice)
Answer: A,C,D
NEW QUESTION # 202
In BGP4+, what is the content of the next hop network address field carried in the P_REA, CHLRI attribute in the Update packet?
Answer: C
NEW QUESTION # 203
On the OSPF network shown in the figure, the cost values of links are marked. OSPF IP FRR is enabled on R1. The primary path from R1 to 10.0.3.3/32 is R1 -> R2 -> R3, and the backup path is R1 -> R4 -> R2 -> R3.
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:To determine whether the statement is true or false, we need to analyze the OSPF network, the cost values of the links, the primary and backup paths, and the role of OSPF IP Fast Reroute (FRR) enabled on R1. Let's break it down step by step:
* Understanding the Network Topology and Costs:
* The network consists of four routers: R1, R2, R3, and R4.
* The destination network is 10.0.3.3/32, located at R3.
* The link costs are as follows:
* R1 to R2: Cost = 10
* R1 to R4: Cost = 10
* R4 to R2: Cost = 20
* R2 to R3: Cost = 5
* The total cost of a path is the sum of the costs of all links in that path.
* Calculating the Primary Path Cost (R1 -> R2 -> R3):
* Path: R1 -> R2 (cost = 10) -> R3 (cost = 5)
* Total cost = 10 + 5 = 15
* This is the shortest path (lowest cost) from R1 to R3, as stated in the question. OSPF uses the Dijkstra algorithm to calculate the shortest path based on link costs, so R1 will naturally select R1
-> R2 -> R3 as the primary path to reach 10.0.3.3/32.
* Calculating the Backup Path Cost (R1 -> R4 -> R2 -> R3):
* Path: R1 -> R4 (cost = 10) -> R2 (cost = 20) -> R3 (cost = 5)
* Total cost = 10 + 20 + 5 = 35
* This path has a higher cost (35) compared to the primary path (15), which is expected for a backup path. The backup path is not used under normal conditions but is precomputed for fast failover in case the primary path fails.
* Role of OSPF IP Fast Reroute (FRR):
* OSPF IP FRR is a mechanism designed to provide fast convergence in case of link or node failures by precomputing backup paths. When enabled on R1, FRR ensures that R1 has a precomputed backup path to quickly switch traffic to an alternate route (e.g., R1 -> R4 -> R2 -> R3) if the primary path (R1 -> R2 -> R3) fails.
* FRR typically uses Loop-Free Alternates (LFA) or other techniques to ensure the backup path does not create loops and is immediately available. In this case, the backup path R1 -> R4 -> R2 -
> R3 is valid because:
* It does not loop back to R1.
* It reaches R3, the destination.
* The cost (35) is higher than the primary path (15), but this is acceptable for a backup path.
* The question states that OSPF IP FRR is enabled on R1, and the backup path is explicitly given as R1 -> R4 -> R2 -> R3. This aligns with FRR's purpose of maintaining a precomputed backup path.
* Verifying the Statement:
* The statement claims: "The primary path from R1 to 10.0.3.3/32 is R1 -> R2 -> R3, and the backup path is R1 -> R4 -> R2 -> R3."
* We calculated that the primary path (R1 -> R2 -> R3) has a cost of 15, which is the shortest path and correct for OSPF's behavior.
* The backup path (R1 -> R4 -> R2 -> R3) has a cost of 35, which is higher but valid as a backup path, especially with OSPF IP FRR enabled on R1 to ensure fast failover.
* Both paths are correctly identified in the question, and OSPF IP FRR's presence on R1 supports the existence of a precomputed backup path. Therefore, the statement is accurate.
* Conclusion:
* The primary path (R1 -> R2 -> R3) and backup path (R1 -> R4 -> R2 -> R3) are correctly described, and OSPF IP FRR on R1 ensures the backup path is precomputed and ready for use.
Thus, the statement is true.
References (Based on HCIP-Datacom-Advanced Routing & Switching Technology Concepts):
* OSPF Path Calculation: HCIP-Datacom documentation on OSPF's Dijkstra algorithm and cost-based path selection (e.g., Section on OSPF Routing Metrics).
* OSPF IP Fast Reroute (FRR): HCIP-Datacom coverage of FRR mechanisms, including Loop-Free Alternates and backup path computation (e.g., Chapter on OSPF Advanced Features and High Availability).
* Link Cost and Path Optimization: HCIP-Datacom explanation of link cost configuration and OSPF path selection (e.g., Section on OSPF Network Design and Optimization).
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NEW QUESTION # 204
In a networking environment where the network is relatively stable and has high requirements for routing convergence time, you can specify the OSPF LSA reception time interval to 0 to cancel the LSA reception time interval, so that topology or routing changes can be immediately perceived, thereby accelerating routing convergence.
Answer: A
NEW QUESTION # 205
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