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

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                                          Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Sample Questions (Q72-Q77):

                                          NEW QUESTION # 72
                                          On the network shown in the figure, IS-IS runs on R1, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. The import-route isis level-2 into level-1 command is configured on R2.
                                          In AS 65000, R1, R3, R4, and R6 each establish iBGP peer relationships with R2 and R5. R2 and R5 are Route Reflectors (RRs), and R1, R4, R3, and R6 are clients.
                                          The iBGP peer relationships are established using Loopback0. The IP address of Loopback0 on each router is
                                          10.0.X.X/32, and the router ID is 10.0.X.X, where X is the number of the router.
                                          R1 and R4 import the external route 192.168.1.0/24 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0/24 to BGP through the import-route command.

                                          Which of the following statements are true?

                                          Answer: A,C

                                          Explanation:
                                          Comprehensive and Detailed In-Depth Explanation:
                                          Understanding the BGP and IS-IS Network Topology in the Question:
                                          * IS-IS Areas:
                                          * Area 49.0001 (Level-1 IS-IS): Contains R1, R2, R4, R5.
                                          * Area 49.0002 (Level-2 IS-IS): Contains R3, R6.
                                          * R2 acts as an ABR (Area Border Router) and redistributes routes between Level-1 and Level-2 using import-route isis level-2 into level-1.
                                          * BGP Route Reflection & Peering:
                                          * R2 and R5 are Route Reflectors (RRs).
                                          * iBGP peering is established among all routers (R1, R2, R3, R4, R5, R6).
                                          * R1 and R4 import 192.168.1.0/24 into BGP, meaning this prefix will be advertised to all iBGP peers.
                                          * R3 and R6 import 192.168.2.0/24 into BGP, meaning this prefix will also be advertised to all iBGP peers.
                                          Route Distribution Analysis:
                                          A). The route 192.168.2.0/24 in the routing table of R4 has two next hops. # (Correct)
                                          * R3 and R6 import 192.168.2.0/24 into BGP.
                                          * R2 and R5 (Route Reflectors) learn this route and reflect it to their clients (R1, R3, R4, R6).
                                          * R4 receives two valid paths to 192.168.2.0/24 via R2 and R5 (both iBGP peers).
                                          * Since both routes have the same BGP attributes and cost, they are installed as equal-cost paths in R4 ' s routing table.
                                          # Statement A is correct: The routing table of R4 has two next hops for 192.168.2.0/24.
                                          B). The routing table of R1 contains two equal-cost default routes. # (Incorrect)
                                          * In an IS-IS Level-1-2 setup, default routes are usually provided to Level-1 routers from an ABR (like R2).
                                          * However, the question does not mention that R1 is receiving two default routes or that it is in an equal- cost multipath (ECMP) scenario.
                                          * R1 may have only one default route, depending on route preference and cost.
                                          # Statement B is incorrect: The routing table of R1 does not necessarily contain two equal-cost default routes.
                                          C). The routing table of R4 contains two equal-cost default routes. # (Incorrect)
                                          * Similar to R1, R4 is also a Level-1 router in IS-IS.
                                          * If R4 were receiving default routes from multiple ABRs (R2 and R5), then it could have equal-cost paths.
                                          * However, there is no indication that R4 is receiving two default routes in this scenario.
                                          # Statement C is incorrect: The routing table of R4 does not necessarily contain two equal-cost default routes.
                                          D). The routing table of R1 contains the route 192.168.2.0/24. # (Correct)
                                          * R3 and R6 import 192.168.2.0/24 into BGP.
                                          * R2 and R5 (Route Reflectors) reflect this route to their iBGP peers, including R1.
                                          * Since R1 is an iBGP client of R2 and R5, it will receive 192.168.2.0/24 and install it in its routing table.
                                          # Statement D is correct: The routing table of R1 contains the route 192.168.2.0/24.
                                          Final Conclusion:
                                          # A. The route 192.168.2.0/24 in the routing table of R4 has two next hops.
                                          # B. The routing table of R1 does not necessarily contain two equal-cost default routes.
                                          # C. The routing table of R4 does not necessarily contain two equal-cost default routes.
                                          # D. The routing table of R1 contains the route 192.168.2.0/24.
                                          Thus, the correct answers are: A, D.
                                          Reference:
                                          HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - BGP Route Reflection and iBGP Route Distribution Huawei Official HCIP-Datacom Study Guide - IS-IS Route Redistribution into BGP Huawei Documentation on BGP Route Reflectors and Import-Route Behavior


                                          NEW QUESTION # 73
                                          On the network shown in the figure, IS-IS IPv6 runs on R2, R6, and R3, and the IPv6 address of Loopback0 on R6 is 2000::6/128. OSPFv3 runs on other links. Area 1 is a stub area, and area 2 is an NSSA. ISIS routes are imported to OSPFv3 on R2 and R3. Which of the following methods can enable R4 to ping 2000: :6?

                                          Answer: A,B,C,D

                                          Explanation:
                                          All four methods can provide the required return path. R2 and R3 import the IS-IS route 2000::6/128 into OSPFv3, allowing R4's Echo Request to reach R6. The remaining requirement is a route on Level-1 router R6 for returning the Echo Reply toward R4, because the OSPFv3 routes are not imported back into IS-IS.
                                          The command:
                                          ipv6 default-route-advertise always level-1
                                          unconditionally originates an IPv6 default route in a Level-1 LSP. Configuring it on either R2 or R3 enables R6 to install ::/0 through that router.
                                          The alternative command:
                                          attached-bit advertise always
                                          forces a Level-1-2 router to set the ATT bit in its Level-1 LSP. When Level-1 router R6 receives an LSP with ATT set, it creates a default route toward the advertising Level-1-2 router. Both R2 and R3 are Level-1-2 routers and participate in the OSPFv3 domain, so either can forward R6's return traffic toward R4.
                                          Thus, either default-route mechanism can be configured on either R2 or R3, making all four options valid.
                                          Huawei IS-IS command reference


                                          NEW QUESTION # 74
                                          A campus has deployed IPv6 for service testing. There are 4 routers in the network, running 0SPFv3 to implement IPv6 network interconnection. As shown in the figure, an engineer checked the LSDB of R2 and intercepted one of the Link-LSAs. Which of the following statements is true about the description of this LSA?

                                          Answer: A,C,D


                                          NEW QUESTION # 75
                                          On a PIM-SM multicast network, a network engineer finds that multicast clients cannot receive multicast data.
                                          Which of the following is not a possible cause of this problem?

                                          Answer: D


                                          NEW QUESTION # 76
                                          Engineer Guan used two routers to test IPv6 services. By running the BGP4+ module to communicate with the branch, as shown in Juxin, an engineer captured packets to view the Updte packets sent by R1. Which of the following statements is true about the description of the message information?

                                          Answer: A,C,D


                                          NEW QUESTION # 77
                                          ......

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