H12-831_V1.0-ENU: HCIP-Datacom-Advanced Routing & Switching Technology V1.0 exam cram sheet - Pass4sure preparation materials

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Huawei H12-831_V1.0-ENU Exam Syllabus Topics:

SectionObjectives
Topic 1: IPv6 and Network Services- IPv6 routing technologies
  • 1. IPv6 addressing and routing
    • 2. Transition mechanisms
      - Network services
      • 1. Network security basics
        • 2. DHCP and NAT concepts
          Topic 2: BGP and Internet Routing- Advanced BGP features
          • 1. Route reflection
            • 2. Confederation
              - BGP fundamentals
              • 1. Route policies and attributes
                • 2. BGP path selection
                  Topic 3: Network Design and Troubleshooting- Troubleshooting methods
                  • 1. Performance optimization
                    • 2. Fault isolation techniques
                      - Enterprise network design
                      • 1. Redundancy and reliability design
                        • 2. Hierarchical network design
                          Topic 4: MPLS and VPN Technologies- MPLS fundamentals
                          • 1. Label switching mechanism
                            • 2. LDP basics
                              - VPN technologies
                              • 1. L3VPN architecture
                                • 2. L2VPN principles
                                  Topic 5: Advanced Routing Protocols- IS-IS Routing Protocol
                                  • 1. IS-IS configuration and troubleshooting
                                    • 2. IS-IS topology and levels
                                      - OSPF Advanced Concepts
                                      • 1. Route calculation and optimization
                                        • 2. LSA types and area types

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                                          Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Sample Questions (Q165-Q170):

                                          NEW QUESTION # 165
                                          On the IS-IS IPv6 network shown in the figure, each interface of R1 and R2 has two IPv6 addresses. Because the IPv6 address prefixes of R1 and R2 are different, they cannot be used to establish a neighbor relationship.

                                          Answer: B

                                          Explanation:
                                          # Key Concept:
                                          IS-IS is a Layer 2 routing protocol and does not rely on IP addressing to establish neighbor relationships.
                                          Unlike OSPF, IS-IS runs directly over the data link layer (CLNS - ISO 8473) and uses MAC-level communication for neighbor discovery.
                                          # IPv6 Addresses in the Scenario:
                                          * R1 Interface:
                                          * 2000:12::1/64
                                          * 2000:21::1/64
                                          * R2 Interface:
                                          * 2000:12::2/127
                                          * 2000:21::2/127
                                          Even if IP prefixes on the interfaces are mismatched, IS-IS adjacency can still be formed, because:
                                          * IS-IS does not use IP address matching for adjacency formation.
                                          * What matters is that the interfaces are on the same Layer 2 segment and IS-IS is enabled on both sides.
                                          # Final Answer: B. FALSE
                                          Official Huawei Extract:
                                          " IS-IS operates at Layer 2 and establishes neighbor relationships regardless of IP address configuration. As long as IS-IS is enabled and interfaces are connected at Layer 2, a neighbor relationship can be established- even with different IP prefixes. "
                                          - [Huawei HCIA-Datacom Certification Guide - IS-IS over IPv6 Chapter]


                                          NEW QUESTION # 166
                                          Service routes of an enterprise are transmitted on the network. Some configurations of PE1 and PE2 are shown in the figure. Which of the following LSAs may CE2 receive?

                                          Answer: A,B

                                          Explanation:
                                          # Updated Explanation:
                                          # OSPF Configuration Summary:
                                          * Both PE1 and PE2 run OSPF multi-instance (ospf 10 vpn-instance VPN1)
                                          * They share the same domain-id 123, which is critical for controlling LSA type behavior.
                                          * Routes from CE1 # PE1 # BGP # PE2 # CE2
                                          # What Happens at PE2:
                                          * PE2 receives VPNv4 BGP routes and re-injects them into OSPF.
                                          * Since domain-id matches between PE1 and PE2, PE2 acts as an ABR, not as an ASBR.
                                          * Therefore, routes are not treated as external (Type 5), but as inter-area (Type 3).
                                          * PE2 is a normal OSPF router toward CE2, so it also sends Type 1 LSAs for its own link and interface states to CE2.
                                          # Final Analysis of Each Option:
                                          * # Type 3 LSA - YesPE2 re-injects BGP-learned routes into OSPF as inter-area (Type 3) due to matching domain-id.
                                          * # Type 1 LSA - YesPE2, as an OSPF router facing CE2, generates Router LSAs (Type 1) describing its own interfaces and links in the local area.
                                          * # Type 5 LSA - NoPE2 does not generate external LSAs because domain-id matches, and the routes are not treated as external.
                                          * # Type 7 LSA - NoType 7 LSAs are only used in NSSA areas, and no NSSA area is mentioned or implied in the diagram.
                                          # Correct Answer: B, C
                                          Official Huawei Extract:
                                          " When the domain-id of two PEs is the same, VPN routes imported into OSPF from BGP are advertised as inter-area routes using Type 3 LSAs. The receiving PE also sends its own Router LSA (Type 1) into the local area. "
                                          - [Huawei HCIA-Datacom Guide - OSPF Interworking with BGP/MPLS VPN]


                                          NEW QUESTION # 167
                                          The MPLS architecture is divided into a control plane and a forwarding plane, which contains multiple protocols and tables. Which of the following tables is responsible for forwarding packets with MPLS labels?

                                          Answer: C


                                          NEW QUESTION # 168
                                          CutoverThe previous information collection can be used to determine whether the services before and after the cutover are normal.

                                          Answer: A


                                          NEW QUESTION # 169
                                          On the OSPFv3 network shown in the figure, area 1 is a stub area. Which of the following statements are true?

                                          Answer: A,B


                                          NEW QUESTION # 170
                                          ......

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