Pass the Huawei HCIP-Datacom H12-831_V1.0 Questions and answers with Dumpstech

A PE imports a VPNv4 route only when at least one RT attached to that route matches an Import RT configured in the receiving VPN instance. Bidirectional communication therefore requires reciprocal matching:

Site1/Site2 ERT must match Site3 IRT.

Site3 ERT must match Site1/Site2 IRT.

Evaluation of the displayed configurations:

Option A — Correct: All PEs export and import 100:1. All three sites import one another’s routes, providing full-mesh communication.

Option B — Incorrect: PE1 exports 200:1, but PE3 imports only 100:1; PE3 exports 200:1, but PE1 imports only 100:1. Consequently, Site1 and Site3 cannot exchange routes bidirectionally.

Option C — Correct: Site1 exchanges routes with Site3 through RT 100:1, while Site2 exchanges routes with Site3 through RT 200:1. PE3 imports and exports both RTs. This supports Site1-to-Site3 and Site2-to-Site3 communication while maintaining separate RT groups for Site1 and Site2.

Option D — Correct: PE1 and PE2 export 200:1, which PE3 imports. PE3 exports 100:1, which PE1 and PE2 import. This is a valid hub-and-spoke RT design with Site3 functioning as the hub.

Huawei specifies that one site’s Export RT must match the other site’s Import RT, and the reverse matching must also exist for bidirectional communication. Huawei BGP/MPLS IP VPN configuration guide

???? Topology Breakdown:

IS-IS IPv6 is running between R2, R3, and R6.

R6’s loopback0 address is 2000::6/128.

R6 is in Area 2, which is an NSSA, and R2/R3 are Level-1-2 routers.

OSPFv3 runs in other parts of the network (R1, R4, R5).

IS-IS IPv6 routes are being redistributed into OSPFv3 by R2 and R3.

???? Option A: The routing table of R1 contains the route 2000::6/128.

✅ True

R3 redistributes IS-IS into OSPFv3.

R3 is connected to Area 0, so the route reaches R1 via normal OSPFv3 inter-area routing.

???? Option B: The routing table of R6 contains the route ::/0.

❌ False

Area 2 is an NSSA, which does not receive Type-5 external LSAs by default.

R6 is in the IS-IS domain only and is not part of the OSPFv3 backbone.

Unless a default route (default-information originate) is configured in redistribution from OSPFv3 to IS-IS (not stated), R6 will not have ::/0.

???? Option C: The routing table of R4 contains the route 2000::6/128.

✅ True

R2 is a Level-1-2 router and redistributes IS-IS routes into OSPFv3.

Area 1 is a normal/common OSPF area, so R4 receives the route from R2 via OSPFv3 Type-5 or Type-3 LSAs.

???? Option D: The routing table of R5 contains the route 2000::6/128.

✅ True

R3 redistributes IS-IS into OSPFv3 in Area 2 (which is NSSA).

OSPFv3 uses Type-7 LSAs in NSSA, which are converted into Type-5 LSAs by the NSSA ABR (R3).

R5 is in Area 2 and will receive the Type-7 LSA directly or the Type-5 LSA after conversion, so it can learn the 2000::6/128 route.

✅ Final Answer: A, C, D

Official Huawei Extract:

" When IS-IS routes are imported into OSPFv3, they are advertised as external routes using Type-5 LSAs in standard areas, and as Type-7 LSAs in NSSAs. NSSA ABRs convert Type-7 LSAs into Type-5 LSAs for propagation into other areas. "

" Common areas can receive redistributed external routes, and routing propagation from IS-IS into OSPFv3 is supported via import-route. "

— [Huawei HCIA-Datacom Certification Guide – IPv6, IS-IS, and OSPFv3 Redistribution Sections]

Software upgrades are important network maintenance activities that introduce new functionality, improve system stability, fix known defects, and enhance network performance.

A conventional Huawei VRP software upgrade involves obtaining a compatible target software package, transferring it to the device, specifying the startup software, and restarting the device when required.

However, the statement incorrectly assumes that all Huawei NetEngine AR series devices use the same software package.

Software package compatibility depends on the device platform, supported hardware, product family, and software version. Physical routers and virtual router platforms do not necessarily use interchangeable system images.

The HCIP training material specifically recommends backing up software packages according to the product and version.

Administrators must verify compatibility before upgrading because loading an unsupported package can cause upgrade failure or system instability.

Therefore, the statement is FALSE.

HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Training Material.pdf

================

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.

In OSPFv3, several new LSA types were introduced to support IPv6. The Link-LSA and Intra-Area-Prefix-LSA have the following roles:

✅ Link-LSA is generated per link by each router. It includes:

Link-local IPv6 address

IPv6 prefix(es) associated with the link

Options related to the interface (bitfields)

✅ Intra-Area-Prefix-LSA describes IPv6 prefix information associated with a Router-LSA or a Network-LSA, rather than embedding it directly within them (as in OSPFv2).

❌ A device does not generate an Intra-Area-Prefix-LSA for each link; instead, it generates it per area, and it can contain multiple prefixes.

✅ Official Reference from Huawei:

" In OSPFv3, prefix information is no longer carried in Router-LSAs or Network-LSAs. Instead, Intra-Area-Prefix-LSAs are used to describe prefixes associated with them. "

" Each router generates one Link-LSA per link. The Link-LSA includes the link-local address and the list of IPv6 prefixes for the link. "

— [Huawei HCIA-Datacom Certification Guide – OSPFv3 Chapter]

To determine the correct command, we need to analyze BGP behavior in a Hub-Spoke topology and how routes are advertised in MPLS VPN environments.

1. Understanding the Hub-Spoke BGP/MPLS VPN Topology

The network consists of Hub-PE and Spoke-PE routers, which are MPLS VPN PEs.

Hub-PE is responsible for distributing routes between Spoke-PE1 and Spoke-PE2.

Spoke routers do not have direct IBGP peering with each other; instead, they rely on the Hub-PE to relay routes.

BGP next-hop handling is critical for proper route advertisement.

2. Why is the " next-hop-self " Command Required?

By default, when BGP advertises a route, the next-hop remains unchanged (i.e., the original next-hop is retained).

In Hub-Spoke topology, Spoke routers would receive routes with a next-hop IP that belongs to another Spoke-PE, which is not reachable directly.

To solve this issue, we use the next-hop-self command on the Hub-PE, so that:

Hub-PE updates the next-hop to its own address before advertising routes to the Spoke-PEs.

This ensures that Spoke-PE routers use the Hub-PE as the next-hop, making routes reachable and preventing blackholing.

3. Correct Command Usage

The administrator must run the following command under the BGP IPv4 address family of the BGP-VPN_out instance on Hub-PE:

shell

CopyEdit

peer 10.1.2.1 next-hop-self

This ensures that the next-hop for advertised routes is changed to the Hub-PE ' s IP, allowing proper route transmission in the Hub-Spoke MPLS VPN environment.

 Network cable → Use a tester to check connectivity.

 Device version file → Check the size of the software package and check whether the file matches the device model.

 Board → Install the board on a device that is not connected to the network and observe the running status of the device.

 License → Check whether the license is in the validity period to prevent device functions from being affected.

 Migration personnel list → Check whether responsibilities and permissions are clearly assigned.

Comprehensive and Detailed In-Depth Explanation:

1. Network Cable - Connectivity Testing:

Before starting a migration project, all network cables should be tested for physical connectivity issues.

Network testers can be used to detect any breaks, shorts, or incorrect wiring.

Ensuring proper connectivity avoids delays and troubleshooting issues during the migration.

2. Device Version File - Software Compatibility Check:

Firmware and software versions must be verified before upgrading or migrating network devices.

The device version file should match the model and hardware specifications to avoid compatibility issues.

If incorrect software is used, the device may not function properly or could become inoperable.

3. Board - Installation and Hardware Verification:

Before installing new hardware modules (boards, line cards, etc.) into a production environment, they should be tested in isolation.

Testing ensures the board is operational and does not introduce faults into the system.

If a board is faulty, it can cause device failure or unexpected behavior in the migration.

4. License - Validity and Activation Check:

Some network devices require licenses for full functionality (e.g., advanced routing, security features).

If a license is expired or missing, critical functions may be disabled after migration.

Checking license status in advance prevents unexpected downtime or service disruptions.

5. Migration Personnel List - Roles and Responsibilities Assignment:

Large network migrations require clear responsibility assignments for each team member.

A migration personnel list ensures that everyone knows their role, tasks, and permissions.

Proper coordination avoids miscommunication, errors, and project delays.

Key Takeaways:

✅ Network cables should be tested for connectivity.

✅ Software versions should match the hardware model to prevent incompatibility.

✅ Hardware boards should be tested before installing into production.

✅ Licenses should be verified to prevent service disruptions.

✅ Migration personnel roles should be clearly defined for smooth execution.

HCIP-Datacom-Advanced Routing & Switching Technology References:

Huawei HCIP-Datacom Official Certification Guide, Chapter on Network Migration Best Practices.

Huawei Enterprise Networking Whitepapers, Guidelines on Software & Hardware Pre-checks for Migration.

Huawei Technical Documentation, License Management in Huawei Datacom Devices.

???? OSPF Area Roles Recap:

Area 1 = Stub➤ Default route is injected by ABR (R2) — ✅ R6 will get a default route.

Area 2 = Totally Stub➤ Default route injected automatically by ABR (R3) — ✅ R4 will get one.

Area 3 = NSSA➤ By default, no default route is injected unless default-information-originate is explicitly configured on the ABR (R1).

???? Therefore:

R5, located in Area 3 (NSSA), will not receive a default route by default.

✅ Final Answer: D. R5

Official Huawei Extract:

" In NSSA areas, default routes are not injected automatically. To provide a default route in NSSA, the ABR must be configured with default-route-advertise or default-information-originate. Stub and totally stub areas receive default routes by default. "

— [Huawei HCIA-Datacom Certification Guide – OSPF Area Types and Route Injection]