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Huawei H12-891_V1.0 Exam Syllabus Topics:

SectionObjectives
Enterprise Network Architecture- Network design principles
  • 1. Scalability and high availability design
    • 2. Hierarchical network architecture
      Routing and Switching Technologies- Switching technologies
      • 1. Ethernet switching mechanisms
        • 2. VLAN and STP
          - IP routing protocols
          • 1. BGP
            • 2. OSPF
              • 3. IS-IS basics
                Data Center and Virtualization Technologies- VXLAN and overlay networks
                • 1. Data center network virtualization
                  IPv6 and Advanced IP Technologies- IPv6 deployment
                  • 1. IPv6 addressing and transition
                    WAN and VPN Technologies- MPLS fundamentals
                    • 1. VPN technologies
                      • 2. MPLS LDP and forwarding
                        Network Security and QoS- Security mechanisms
                        • 1. ACL and traffic control
                          • 2. Basic network security design
                            - QoS mechanisms
                            • 1. Traffic classification and shaping
                              Network Automation and Programmability- SDN and automation
                              • 1. NETCONF/YANG basics
                                • 2. Network automation tools

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                                  Huawei HCIE-Datacom V1.0 Sample Questions (Q222-Q227):

                                  NEW QUESTION # 222
                                  In order to study the working mechanism of the OSPFv3 protocol, a project to build a network topology is as follows, the configuration of R1 and R2 is as follows, please ask the LSA switched between R1 and R2 What are the types?

                                  Answer: A,C,D


                                  NEW QUESTION # 223
                                  On a broadcast network, if the DR priorities of two interfaces connecting two routers are set to 0, in which of the following states will the OSPF neighbor relationship stay?

                                  Answer: A

                                  Explanation:
                                  In OSPF (Open Shortest Path First), routers connected over broadcast networks (like Ethernet) elect a Designated Router (DR) and Backup Designated Router (BDR). DR election is based on the interface priority. If the priority is set to 0, the router cannot become a DR or BDR.
                                  When both routers have a priority of 0, no DR or BDR will be elected, and since the election fails, the neighbor relationship between the two routers will not advance beyond the 2-Way state. In this state, the routers acknowledge each other but do not exchange routing information in detail (as they only form full adjacency with the DR/BDR).
                                  Therefore, the OSPF neighbor relationship remains in the 2-Way state.


                                  NEW QUESTION # 224
                                  Which of the following intelligent traffic steering policies can be used to fully utilize link bandwidth and implement link bandwidth-based load balancing on an enterprise network with multiple links?

                                  Answer: A

                                  Explanation:
                                  Huawei SD-WAN supports various intelligent traffic steering mechanisms to optimize link utilization and balance network traffic across multiple links.
                                  โœ… D. Traffic bandwidth-based traffic steering
                                  This method ensures that traffic is distributed across multiple links based on available bandwidth.
                                  SD-WAN dynamically selects links based on their real-time bandwidth utilization, ensuring optimal performance and load balancing.


                                  NEW QUESTION # 225
                                  As shown in the figure, R1, R2, R3, and R4 reside in the same MPLS domain, and LDP (Label Distribution Protocol) is used to distribute MPLS labels.
                                  R4 is the egress LSR (Label Switching Router) for the FEC (Forwarding Equivalence Class) 4.4.4.0/24.
                                  To make R4 aware of QoS forwarding priority of a packet sent from R1 and destined for 4.4.4.0/24, Without looking up R4's label forwarding information base, The outgoing label of the FEC on R3 should be _____ (Enter an Arabic numeral without symbols).

                                  Answer:

                                  Explanation:
                                  0
                                  Explanation:
                                  Understanding MPLS LDP and PHP (Penultimate Hop Popping):
                                  #Label Distribution in MPLS LDP:
                                  LDP assignslabels to FECsso that routers can forward packets based on labels rather than IP lookup.
                                  Labels areadvertised downstream(from R4 to R3, R3 to R2, and so on).
                                  #Penultimate Hop Popping (PHP) Concept:
                                  Theegress LSR (R4)doesnot require an incoming labelfor 4.4.4.0/24.
                                  Instead,R3 (Penultimate LSR) removes the labelbefore forwarding the packet to R4.
                                  R3 forwards the packet as an IP packet, not an MPLS packet, toavoid an unnecessary label lookup at R4.
                                  InMPLS LDP, the label "0" is used to indicate an implicit NULL label (PHP operation).
                                  Why the Answer is "0" (Implicit NULL Label)?
                                  #Since R4 is the egress LSR, it does not need a label for 4.4.4.0/24.
                                  #R3 assigns the outgoing label as "0" (Implicit NULL Label)to indicate that the label should be removed before sending to R4.
                                  #R4 receives the packet as a pure IP packet (no MPLS label).
                                  Why Other Answers Are Incorrect?
                                  #Any value other than "0"
                                  If R3 assigns a label (e.g., 100), R4 would need to perform anunnecessary MPLS lookup, which is inefficient.
                                  Using "0" ensures PHP occurs, optimizing the forwarding process.
                                  #Reference:Huawei HCIE Datacom - MPLS LDP and Penultimate Hop Popping (PHP)


                                  NEW QUESTION # 226
                                  In a scenario where a VXLAN tunnel is dynamically established through BGP EVPN, which of the following fields is NOT carried in BGP EVPN Type 5 routes?

                                  Answer: D

                                  Explanation:
                                  Understanding BGP EVPN and VXLAN Routing
                                  EVPN (Ethernet VPN) with VXLAN is used for data center networking and L3 VPN interconnection.
                                  # BGP EVPN Route Types & Their Purpose
                                  * Type 2: MAC/IP Advertisement Route (Carries MAC + IP)
                                  * Type 3: Inclusive Multicast Route (Carries VTEP Multicast Information)
                                  * Type 5: IP Prefix Route (Used for Layer 3 VXLAN Routing)
                                  # What does Type 5 route contain?
                                  * # Route Distinguisher (RD): Identifies a unique VPN instance.
                                  * # GW IP Address: Specifies the Gateway IP for L3 VXLAN routing.
                                  * # IP Prefix Length: Defines the IPv4/IPv6 network mask for routing.
                                  * # MAC Address is NOT included in Type 5
                                  Why is Option B (MAC Address) Correct?
                                  # MAC addresses are carried in EVPN Type 2 routes, NOT in Type 5.# Type 5 routes focus on IP prefixes, not MAC forwarding.
                                  # Real-World Application:
                                  * VXLAN L3 Gateways (EVPN Type 5) allow routers to forward IP traffic across VXLAN tunnels, removing the need for traditional L3 VPNs.
                                  # Reference: Huawei HCIE-Datacom Guide - BGP EVPN and VXLAN Routing


                                  NEW QUESTION # 227
                                  ......

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