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| Section | Weight | Objectives |
|---|---|---|
| Network O&M | 7% | - Configuration management and backup - Routine maintenance procedures - Log and alarm management - Network monitoring and performance analysis |
| Advanced Ethernet Technologies | 10% | - VLAN aggregation and MUX VLAN - Ethernet link aggregation and reliability - Port isolation and security features - QinQ and VLAN mapping |
| IPv6 Routing | 20% | - Transition mechanisms (dual-stack, tunnel, translation) - BGP4+ for IPv6 - OSPFv3 and IS-IS for IPv6 - IPv6 address planning and configuration |
| Advanced IGP Features | 17% | - IS-IS advanced features
|
| Advanced BGP Features | 10% | - BGP multi-homing and load balancing - Route reflectors and confederations - BGP route selection and attributes - Routing policies and filtering |
| MPLS Technologies | 19% | - MPLS OAM and protection - MPLS VPN (L3VPN, L2VPN) - LDP and RSVP-TE protocols - MPLS fundamentals and label distribution |
| Network Cutover | 7% | - Pre-cutover verification - Cutover planning and risk assessment - Post-cutover validation - Implementation and rollback strategy |
| Network Troubleshooting | 10% | - Routing protocol fault diagnosis - Switching and link fault handling - Performance and service fault resolution - Structured troubleshooting methodology |
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NEW QUESTION # 167
As shown in the figure, the message is forwarded based on MPLS in the network. When PE2 receives the message sent by P2, which of the following is the label value carried in the message?
Answer: D
NEW QUESTION # 168
In the IS-IS IPv6 network shown in the figure, when the network is stable, R2 can ping 2000:12::1, but the MAC address corresponding to 2000:12::1 cannot be seen through "display ipv6 neighbors".
Answer: B
NEW QUESTION # 169
On the OSPFv3 network shown in the figure, OSPFv3 parameters use default values. The LSDB is checked on one of the devices. The router IDs of R1, R3, and R4 are 10.0.1.1, 10.0.3.3, and 10.0.4.4, respectively. The Origin Router part of some LSAs is hidden. Complete this part. (Tokens can be reused.)
Answer:
Explanation:
Explanation:
LSAs and Their Origin Router Associations:
* Link-LSA: Origin Router = 10.0.1.1
* Intra-Area-Prefix-LSA: Origin Router = 10.0.4.4
* Network-LSA: Origin Router = 10.0.3.3
* Inter-Area-Prefix-LSA: Origin Router = 10.0.1.1
NEW QUESTION # 170
In a campus network using Eth-Trunk with dynamic LACP mode, traffic across bundled interfaces is unevenly distributed. Which factor determines how traffic is load-balanced?
Answer: B
NEW QUESTION # 171
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 # 172
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