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Huawei H12-831_V1.0 Exam Syllabus Topics:

SectionObjectives
Network Design and Troubleshooting- Troubleshooting methods
  • 1. Fault isolation techniques
    • 2. Performance optimization
      - Enterprise network design
      • 1. Hierarchical network design
        • 2. Redundancy and reliability design
          Advanced Routing Protocols- OSPF Advanced Concepts
          • 1. Route calculation and optimization
            • 2. LSA types and area types
              - IS-IS Routing Protocol
              • 1. IS-IS configuration and troubleshooting
                • 2. IS-IS topology and levels
                  BGP and Internet Routing- Advanced BGP features
                  • 1. Route reflection
                    • 2. Confederation
                      - BGP fundamentals
                      • 1. BGP path selection
                        • 2. Route policies and attributes
                          IPv6 and Network Services- Network services
                          • 1. DHCP and NAT concepts
                            • 2. Network security basics
                              - IPv6 routing technologies
                              • 1. IPv6 addressing and routing
                                • 2. Transition mechanisms
                                  MPLS and VPN Technologies- MPLS fundamentals
                                  • 1. LDP basics
                                    • 2. Label switching mechanism
                                      - VPN technologies
                                      • 1. L2VPN principles
                                        • 2. L3VPN architecture

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                                          Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Sample Questions (Q29-Q34):

                                          NEW QUESTION # 29
                                          When a fault occurs, the fault can be classified to reduce the scope of fault location. Which of the following is not an interface configuration fault?

                                          Answer: D


                                          NEW QUESTION # 30
                                          On the OSPFv3 network shown in the figure, area 1 is a stub area, area 2 is a common area, and area 3 is an NSSA. The IPv6 address of Loopback0 on R5 is 2000::5/128, and routes are imported to OSPFv3 through the import-route command. The router ID of each router is 10.0.X.X, where X is the number of the router. Which of the following statements are true?

                                          Answer: A,D

                                          Explanation:
                                          # Area Overview from Diagram:
                                          * Area 1 (Green) - Stub area
                                          * Area 2 (Red) - Common (standard) area
                                          * Area 3 (Blue) - NSSA
                                          * R5 in Area 3 (NSSA) is redistributing static IPv6 route 2000::5/128 using import-route.
                                          # Option A: R1 generates an AS-External-LSA.
                                          # False
                                          * R1 is in Area 1, a stub area.
                                          * AS-External-LSAs (Type-5) are not allowed in stub areas.
                                          * So R1 cannot generate Type-5 LSAs, nor can it forward them into Area 1.
                                          # Option B: R3 generates an AS-External-LSA.
                                          # True
                                          * Area 3 is an NSSA, and R5 redistributes a route (2000::5/128) via import-route.
                                          * In NSSA, redistributed routes are advertised using Type-7 LSAs.
                                          * R3, acting as the ABR for Area 3, translates Type-7 to Type-5 LSAs (AS-External-LSA) and floods them into Area 0.
                                          * Therefore, R3 generates the AS-External-LSA.
                                          # Option C: R2 generates an Inter-Area-Router-LSA in area 0.
                                          # True
                                          * R2 connects Area 0 and Area 2.
                                          * It must advertise its area 2 prefixes into area 0, and it does so using Type-3 Inter-Area-Prefix-LSA and Type-4 Inter-Area-Router-LSA.
                                          * Type-4 LSA carries ASBR information, which R2 must advertise into Area 0.
                                          # Option D: R2 generates an Inter-Area-Router-LSA in area 2.
                                          # False
                                          * Inter-Area-Router-LSA (Type-4) is used only to describe an ASBR in another area.
                                          * R2 would not generate Type-4 LSAs into its own attached area (Area 2).
                                          * It injects Type-4 into other areas (like Area 0), not into Area 2.
                                          # Final Answer: B, C
                                          Official Huawei Extract:
                                          " In OSPFv3, Type-5 LSAs (AS-External) are not allowed in stub areas and NSSAs. In an NSSA, redistributed routes are advertised as Type-7 LSAs. These are translated into Type-5 LSAs by the ABR for flooding into the backbone area. Inter-Area-Router-LSAs (Type-4) are used to inform other areas about ASBRs. "
                                          - [Huawei HCIA-Datacom Certification Guide - OSPFv3 LSA Types and Area Roles Chapter]


                                          NEW QUESTION # 31
                                          An RR and its clients form a cluster, which is identified by a unique cluster ID in an AS. When a route is reflected by an RR for the first time, the RR adds the local cluster ID to the top of the Cluster_List attribute if the Cluster_List attribute value is empty. If the Cluster_List attribute has a value, the RR does not modify the value.

                                          Answer: A

                                          Explanation:
                                          This statement is false . In Huawei ' s implementation of BGP Route Reflectors:
                                          * Each RR (Route Reflector) and its clients form a cluster identified by a cluster ID .
                                          * When an RR reflects a route:
                                          * If the Cluster_List is empty , it adds the local cluster ID.
                                          * If the Cluster_List already contains values , it adds the local cluster ID to the beginning of the list.
                                          So the RR does modify the Cluster_List by adding its own cluster ID regardless of whether the list is empty or not.
                                          # Official Reference from Huawei:
                                          " When an RR reflects a route, it adds its own Cluster_ID to the Cluster_List attribute regardless of whether the Cluster_List is empty or not. This mechanism prevents routing loops. "
                                          - [Huawei HCIA-Datacom Certification Guide - BGP Route Reflector Section]


                                          NEW QUESTION # 32
                                          In the figure, an administrator needs to enable MPLS LDP on R1 to R4. Which of the following configurations of R1 is correct?

                                          Answer: B

                                          Explanation:
                                          Comprehensive and Detailed In-Depth Explanation:
                                          To determine the correct configuration, we need to analyze how MPLS LDP (Label Distribution Protocol) is correctly enabled on a Huawei router.
                                          1. Required Steps to Enable MPLS LDP on R1
                                          To enable MPLS LDP on R1 and establish LDP sessions, the following steps must be followed:
                                          # Step 1: Configure the MPLS LSR ID (Loopback IP recommended)
                                          * MPLS LSR ID is a unique identifier for the Label Switch Router (LSR).
                                          * Command:
                                          shell
                                          CopyEdit
                                          mpls lsr-id 1.1.1.1
                                          * Why?
                                          * The LSR ID must be configured for LDP to function properly in an MPLS network.
                                          * It is usually set to a loopback address for stability and consistency.
                                          # Step 2: Enable MPLS Globally
                                          * Command:
                                          shell
                                          CopyEdit
                                          mpls
                                          * Why?
                                          * This enables MPLS forwarding on the device.
                                          # Step 3: Enable MPLS LDP Globally
                                          * Command:
                                          shell
                                          CopyEdit
                                          mpls ldp
                                          * Why?
                                          * LDP is needed for label distribution in the MPLS domain.
                                          * Without this, routers cannot exchange MPLS labels.
                                          # Step 4: Enable MPLS and LDP on the Required Interface
                                          * Command:
                                          shell
                                          CopyEdit
                                          interface gigabitethernet 0/0/1
                                          mpls
                                          mpls ldp
                                          * Why?
                                          * MPLS must be enabled on interfaces that participate in MPLS forwarding.
                                          * LDP must also be enabled on these interfaces to distribute labels over MPLS links.
                                          2. Analyzing the Answer Choices
                                          # Option B (Correct)
                                          shell
                                          CopyEdit
                                          [R1] mpls lsr-id 1.1.1.1 # (Sets LSR ID)
                                          [R1] mpls # (Enables MPLS globally)
                                          [R1-mpls] quit
                                          [R1] mpls ldp # (Enables LDP globally)
                                          [R1-mpls-ldp] quit
                                          [R1] interface gigabitethernet 0/0/1
                                          [R1-GigabitEthernet0/0/1] mpls # (Enables MPLS on interface)
                                          [R1-GigabitEthernet0/0/1] mpls ldp # (Enables LDP on interface)
                                          [R1-GigabitEthernet0/0/1] quit
                                          * This configuration correctly enables MPLS LDP on R1.
                                          * All required steps are followed, including the LSR ID, MPLS, LDP, and interface activation.
                                          # Option A (Incorrect)
                                          shell
                                          CopyEdit
                                          [R1] mpls lsr-id 1.1.1.1
                                          [R1] mpls
                                          [R1-mpls] quit
                                          [R1] mpls ldp
                                          [R1-mpls-ldp] quit
                                          [R1] interface gigabitethernet 0/0/1
                                          [R1-GigabitEthernet0/0/1] mpls #
                                          [R1-GigabitEthernet0/0/1] quit # (Missing " mpls ldp " under interface)
                                          * Missing mpls ldp under interface configuration.
                                          * Without this, the interface will not establish an LDP session # Incorrect.
                                          # Option C (Incorrect)
                                          shell
                                          CopyEdit
                                          [R1] mpls
                                          [R1-mpls] quit
                                          [R1] mpls ldp
                                          [R1-mpls-ldp] quit
                                          [R1] interface gigabitethernet 0/0/1
                                          [R1-GigabitEthernet0/0/1] mpls
                                          [R1-GigabitEthernet0/0/1] mpls ldp
                                          [R1-GigabitEthernet0/0/1] quit
                                          * Missing mpls lsr-id 1.1.1.1.
                                          * LSR ID is critical for LDP sessions # Incorrect.
                                          # Option D (Incorrect)
                                          shell
                                          CopyEdit
                                          [R1] mpls lsr-id 1.1.1.1
                                          [R1] mpls
                                          [R1-mpls] quit
                                          [R1] interface gigabitethernet 0/0/1
                                          [R1-GigabitEthernet0/0/1] mpls
                                          [R1-GigabitEthernet0/0/1] mpls ldp
                                          [R1-GigabitEthernet0/0/1] quit
                                          * Missing global MPLS LDP configuration (mpls ldp).
                                          * Without enabling LDP globally, labels will not be distributed.
                                          * This makes LDP sessions fail. # Incorrect.


                                          NEW QUESTION # 33
                                          Which of the following operations is not part of the middle stage of dissection?

                                          Answer: A


                                          NEW QUESTION # 34
                                          ......

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