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| Section | Weight | Objectives |
|---|---|---|
| Advanced BGP Features | 10% | - BGP path control and filtering - Route reflectors and confederations - BGP route attributes and policies |
| IPv6 Routing | 20% | - IPv6 addressing and transition technologies - BGP4+ and IPv6 route deployment - OSPFv3 and IS-IS for IPv6 |
| Network Troubleshooting | 10% | - Fault diagnosis and analysis methods - Troubleshooting routing and switching issues |
| Network Cutover and Migration | 7% | - Migration strategies and risk control - Service switchover and verification |
| MPLS Technologies | 19% | - MPLS protection and fast reroute - MPLS basics and label distribution - MPLS VPN and traffic engineering |
| Advanced IGP Features | 17% | - OSPF advanced features and optimization - IS-IS advanced features and convergence - IGP route selection and control |
| Advanced Ethernet Technologies | 10% | - Ethernet OAM and protection mechanisms - Advanced link aggregation and reliability - VLAN stacking and QinQ |
| Network O&M | 7% | - Performance optimization and capacity planning - Network monitoring and management tools |
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NEW QUESTION # 230
Which of the following commands must the administrator configure when enabling the MPLS LDP function on the GE0/0/1 interface of the device? (Multiple choice)
Answer: A,B,C,D
NEW QUESTION # 231
On the network shown in the figure, a network engineer finds that the path between PC1 and PC2 is not the optimal path, and all links along the path have the same cost.
Given this, which of the following routers may be the root bridges of the Layer 2 network?
Options:
Answer: B,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the Spanning Tree Protocol (STP) and Root Bridge Selection
* Spanning Tree Protocol (STP) is used to prevent loops in a Layer 2 network by electing a Root Bridge and determining a loop-free topology.
* The Root Bridge is elected based on the lowest Bridge ID (BID), which consists of:
* Priority Value (Lower is preferred, default is 32768).
* MAC Address (Lower MAC wins in case of a tie).
* The optimal forwarding path is chosen based on cost, which is usually determined by the link bandwidth.
Why the Path is Not Optimal?
* The network engineer states that all links have the same cost, meaning that the STP Root Bridge election determines the topology rather than cost differences.
* The fact that the path between PC1 and PC2 is suboptimal suggests that the Root Bridge may not be ideally placed.
Determining the Likely Root Bridge:
* The Root Bridge is the switch with the lowest BID (priority + MAC).
* All switches calculate the shortest path to the Root Bridge and place ports in either Forwarding or Blocking mode.
* From the diagram, the traffic is flowing through SW2 # SW4 # SW3 instead of directly via SW2 # SW3.
* This suggests that the Root Bridge is likely SW1 or SW4 because:
* Root Bridges do not block any ports.
* If SW1 or SW4 is the Root Bridge, the spanning tree topology might force the path to take a longer route.
Key Takeaways:
* Root Bridge selection influences the entire Layer 2 forwarding path.
* The lowest Bridge ID (priority + MAC) determines the Root Bridge.
* If a suboptimal path is taken, the Root Bridge is likely placed in a location that forces certain links to block.
* In this scenario, SW1 or SW4 is the most probable Root Bridge, forcing traffic through an unintended path.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Huawei HCIP-Datacom Official Certification Guide, Chapter on Spanning Tree Protocol (STP) and Root Bridge Selection.
* Huawei Datacom Training Materials, Section on STP Convergence and Network Optimization.
* Huawei Datacom Configuration Guide, Command Reference for STP Root Bridge Selection and Path Calculation.
NEW QUESTION # 232
A network engineer provides a troubleshooting report after rectifying a fault. The actual network is simplified into the one shown in the figure, where R1 and R2 both have OSPF enabled and function as the gateways of PC1 and PC2, respectively .
Given this, which of the following statements are true?
Network Topology:
* R1:
* Interface GE0/0/0 : 10.0.12.1/24 (Connected to R2)
* Interface GE0/0/1 : 192.168.1.1/24 (Gateway for PC1)
R2:
* Interface GE0/0/0 : 10.0.12.2/24 (Connected to R1)
* Interface GE0/0/1 : 192.168.1.2/24 (Gateway for PC2)
Options:
Answer: B,C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
* Understanding the network connectivity:
* R1 and R2 are connected through 10.0.12.0/24 and running OSPF in Area 0.
* PC1 (192.168.1.11/24) is connected to R1 , and PC2 (192.168.1.12/24) is connected to R2 .
* Analyzing each option:
* Option A: " R2 cannot ping 10.0.12.1. " # Incorrect
* R2 is directly connected to 10.0.12.1/24 (R1) on GE0/0/0 , so it can ping this IP without any routing issues.
* Option B: " PC1 and PC2 cannot ping each other. " # Correct
* OSPF is only running between R1 and R2 . There is no indication that R1 and R2 are redistributing connected routes (192.168.1.0/24 and 192.168.1.0/24) into OSPF.
* As a result, R1 does not know how to reach 192.168.1.12 , and R2 does not know how to reach 192.168.1.11 , making communication between PC1 and PC2 impossible .
* Option C: " R1 cannot ping 192.168.1.2. " # Incorrect
* 192.168.1.2 is directly connected to R2 , and if R1 can reach R2 through OSPF, then R1 should be able to ping 192.168.1.2.
* Option D: " R1 cannot ping 192.168.1.12. " # Correct
* 192.168.1.12 is connected to R2 , but if R2 does not advertise this network to R1, R1 has no route to reach it .
* Since PC1 (192.168.1.11) and PC2 (192.168.1.12) are on different subnets, and there ' s no redistribution , R1 cannot reach PC2 ' s IP .
Key Takeaways and Fix Recommendations:
* To allow PC1 and PC2 to communicate , R1 and R2 must advertise their directly connected networks (192.168.1.0/24) in OSPF using the network command or by redistributing connected routes into OSPF.
* Command example:
makefile
CopyEdit
R1:
router ospf 1
network 192.168.1.0 0.0.0.255 area 0
R2:
router ospf 1
network 192.168.1.0 0.0.0.255 area 0
* This would allow R1 to learn about PC2 ' s network and R2 to learn about PC1 ' s network , enabling communication.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* HCIP-Datacom Official Certification Guide , Chapter on OSPF Network Design and Troubleshooting .
* Huawei Datacom Training Materials , Section on OSPF Inter-Area and External Route Advertisements .
* Huawei Datacom Configuration Guide , Command Reference for OSPF network advertisement and route redistribution .
NEW QUESTION # 233
On the network shown in the figure, OSPF runs on R1, R2, and R3, and OSPF BFD is enabled. R1 and R3 use loopback interfaces to establish an iBGP peer relationship. If GE0/0/1 of R2 is shut down, which of the following is the longest period after which the BGP peer relationship of R1 will change from Up to Down?
Answer: D
Explanation:
# Key Facts from the Scenario:
* OSPF runs between R1-R2-R3.
* iBGP peer relationship is established between loopback interfaces of R1 and R3 .
* BGP does not detect link failures directly because it runs over loopbacks and relies on the underlying routing protocol (OSPF here).
* BFD (Bidirectional Forwarding Detection) is enabled with OSPF to provide fast failure detection .
# What Happens If GE0/0/1 on R2 Fails?
* The OSPF adjacency between R2 and R3 fails.
* Normally, OSPF would take up to 40 seconds (default dead interval) to detect this.
* However, with BFD enabled , the failure can be detected in as little as 1 second (depending on timers).
* Huawei typically configures BFD with a default detection time of around 3 seconds unless specifically tuned lower.
# Impact on BGP:
* Since the route to R3's loopback disappears quickly due to BFD detection, R1 loses the next-hop reachability to R3.
* As a result, the iBGP session between R1 and R3 will go Down within approximately 3 seconds .
# Therefore, the maximum period before BGP peering drops is 3 seconds.
# Final answer: C. 3s
Official Huawei Extract:
" BFD provides fast link failure detection for protocols such as OSPF. When BFD is enabled, the failure detection time can be reduced to milliseconds or a few seconds, allowing upper-layer protocols like BGP to react quickly to routing failures. "
- [Huawei HCIA-Datacom Certification Guide - OSPF Fast Convergence and BFD Integration Chapter]
NEW QUESTION # 234
Part of the configuration of R1 is as follows, which of the following statement about OSPF on R1 is correct? (Multiple choice)
Answer: A,B
NEW QUESTION # 235
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