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The H12-831_V1.0 exam covers a wide range of topics related to advanced routing and switching technologies. These include the design and implementation of large-scale networks, the use of advanced routing protocols, the configuration of complex network services, and the troubleshooting of network issues. H12-831_V1.0 Exam also covers the latest technologies in the field, including virtualization, software-defined networking (SDN) and network function virtualization (NFV).
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The HCIP-Datacom-Advanced Routing & Switching Technology V1.0 certification exam is the second level of certification in the Huawei certification path, following the HCIA-Datacom certification. H12-831_V1.0 Exam covers a wide range of topics including advanced routing, switching, MPLS VPN, multicast, QoS, and network security. It is designed to test the candidate's ability to plan, design, implement, operate, and troubleshoot complex enterprise-level networks.
NEW QUESTION # 162
As shown in the figure, OSPF is enabled on all the routers. The IP address marked in the figure is the IP address of the loopbackO interface of the device. The LoopbackO of R1 and R2 is advertised in area 1, the LoopbackO of R4 is advertised in area 0, and the LoopbackO of R3 and R5E is advertised in area 0. In area 2, which of the following IP addresses can ping each other?
Answer: B,D
NEW QUESTION # 163
If the migration preparation is insufficient, which of the following problems may occur?
Options (Multiple Choice):
Answer: A,B,C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
* Network migration requires detailed planning to prevent service disruptions and rollback failures.
* Potential issues due to poor preparation:# A. No network cable tester available # Hard to diagnose whether the issue is hardware or cable-related.# B. No backup of configuration files # If migration fails, services cannot be restored quickly.# C. No spare hardware available # Hardware failures may cause long service downtimes.# D. Engineers arriving late # Delays may lead to extended service downtime or missed migration windows.
# Reference: HCIP-Datacom Advanced Routing & Switching Technology - Migration Best Practices
NEW QUESTION # 164
On the OSPF network shown in the figure, a network engineer finds that R1 and R2 have the same router ID, and both have imported default routes (with the default-route-advertise always command configured). Given this, which of the following statements is false?
Answer: D
NEW QUESTION # 165
The figure shows information about an LSP (Link-State PDU) generated by an IS-IS router.
From the LSP, you can infer that the router is not the DIS (Designated Intermediate System) of the local link.
Options:
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding the DIS (Designated Intermediate System) in IS-IS
* In IS-IS, the DIS (Designated Intermediate System) is similar to the DR (Designated Router) in OSPF.
* Unlike OSPF, IS-IS does not use an election based on priority; instead, the router with the highest priority becomes the DIS.
* If there is a tie in priority, the router with the highest MAC address on the interface becomes the DIS.
* The DIS is responsible for generating additional LSPs (pseudonode LSPs) for the link and synchronizing the database between routers.
2. How to Identify If the Router Is the DIS from the LSP
* In the given LSP output, there are NO pseudonode LSPs (LSPs ending with .01).
* The DIS is responsible for creating pseudonode LSPs, which represent a multi-access network in the IS- IS topology.
* If the router were the DIS, it would generate both its own LSP (ending in .00) and a pseudonode LSP (ending in .01).
* Since we only see an LSP ending in .00, this confirms that the router is NOT the DIS.
3. Evaluating the Answer Choices
* Option A (TRUE) - Correct:
* Since no pseudonode LSP is present, the router is not the DIS.
* This confirms that the statement is TRUE.
* Option B (FALSE) - Incorrect:
* If the router were the DIS, it would generate pseudonode LSPs, but they are missing from the output.
* Therefore, the statement is NOT false.
Final answer:
HCIP-Datacom-Advanced Routing & Switching Technology References:
* IS-IS Designated Intermediate System (DIS) Selection Process
* Pseudonode LSP Generation in Multi-Access Networks
* IS-IS LSP Structure and Identification of DIS
NEW QUESTION # 166
On an enterprise network shown in the figure, if CE2 is dual-homed to PE2 and PE3, a routing loop may occur during the exchange of Type 3 LSAs. To prevent the loop, the dn-bit-set disable command can be run on PE2 and PE3.
Answer: B
Explanation:
# Background:
* This is an MPLS VPN with OSPF as the PE-CE routing protocol .
* CE2 is dual-homed to both PE2 and PE3 , creating the possibility of route feedback/loops between the PEs through CE2.
# What Causes the Loop?
* Normally, when a route is redistributed from BGP into OSPF on the PE, the OSPF DN bit is set in the Type 3 or Type 5 LSA.
* The DN bit tells other routers: " Do not redistribute this route back into BGP ."
* CE2, not understanding the DN bit, may ignore it and re-advertise the route from PE2 to PE3 and vice versa.
# Problem:
* If both PE2 and PE3 accept the redistributed LSA from CE2 and re-inject it into the VPN, a routing loop can occur.
# Solution:
* To avoid this, Huawei supports the command:
bash
CopyEdit
dn-bit-set disable
* This command disables DN-bit marking on the PE, avoiding potential loop prevention issues with non- DN-bit-aware CEs.
# Final answer: A. TRUE
Official Huawei Extract:
" In dual-homing OSPF VPN scenarios, routing loops may occur due to Type 3 LSA exchange if the CE does not process DN-bit. Running dn-bit-set disable on the PE prevents loop issues by not setting the DN-bit. "
- [Huawei HCIA-Datacom Certification Guide - OSPF in MPLS VPN and DN-Bit Handling]
NEW QUESTION # 167
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