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Huawei H12-891 Online Practice Questions and Exam Preparation

H12-891 Exam Details

  • Exam Code
    :H12-891
  • Exam Name
    :HCIE-Datacom V1.0
  • Certification
    :Huawei Certifications
  • Vendor
    :Huawei
  • Total Questions
    :923 Q&As
  • Last Updated
    :May 27, 2026

Huawei H12-891 Online Questions & Answers

  • Question 581:

    What is not included in the switch roles within a stacking system?

    A. From the switch
    B. Candidate switch
    C. Standby switch
    D. Primary switch

  • Question 582:

    The HW appliance network administrator plans to migrate IGMPv2 in the multicast network to IGMPv3. Where does IGMPv3 improve over IGMPv2? (Choose three)

    A. IGMPv3 adds the ability for hosts to specify multicast groups that do not join a specific multicast source.
    B. IGMPv3 adds the ability for hosts to specify multicast groups that are joined to a specific multicast source.
    C. IGMPv3 adds Request-to-send and Clear-to-send between source and local IGMP queries.
    D. IGMPv3 removes the Report-suppression feature for membership reporting.
    E. IGMPv3 removes the ability to include all sources in a wildcard group.

  • Question 583:

    Regarding Route Policy, which of the following descriptions are correct? (Choose three)

    A. Advanced ACLs can be applied in route-policy to filter routes.
    B. The table entries permit::0 less than or equal to 128 indicate that all IPv6 routes are allowed through.
    C. If more than one node is defined in a route policy, there should be at least one node in each policy that matches permit.
    D. Route policy filters only the default route.

  • Question 584:

    Regarding the label space for MPLS, which of the following descriptions is incorrect?

    A. When the penultimate-hop LSR performs a label swap, if the swapped label value is found to be 3, the label is popped by default and the packet is sent to the last hop
    B. the tag is popped up by default and the message is sent to the last hop
    C. Labels above 1024 are in the label space shared by dynamic signaling protocols such as LDP, RSVP-TE, and MP-BGP
    D. Labels 16?023 are label space shared by static LSPs and static CR-LSPs

  • Question 585:

    On the campus network shown, IPv6 has been deployed for service testing. Four routers are connected, and OSPFv3 is used to provide IPv6 network connectivity. An engineer checks the LSDB of R2 and obtains the following Link-LSA entry:

    Which of the following statements about this LSA are correct? (Choose three)

    A. The link-local address of R2's GE0/0/0 interface is FE80::2E0:FCFF:FECD:4F79.
    B. The IPv6 address prefix of R2's GE0/0/0 interface is 2001:DB8:2345:23::/64.
    C. This LSA indicates that R2 does not support external routes but can participate in IPv6 route calculation.
    D. This LSA is generated by R2.

  • Question 586:

    Which of the following statement about IS-IS protocol LSP messages is correct? (Choose four)

    A. The IS-IS rapid flooding feature prioritizes flooding smaller LSPs first, accelerating LSDB synchronization
    B. By configuring an LSP-generation intelligent timer, the timer automatically adjusts the delay based on how frequently routing information changes
    C. As link-state information increases, the LSP packet size can be increased so that each LSP can carry more information
    D. Reducing the minimum interval at which LSPs are sent per port can speed up LSP flooding

  • Question 587:

    Which of the following descriptions of MPLS BGPVPN is incorrect?

    A. The TTL field in the label has the effect of preventing loops.
    B. IBGP PEs generally use the Loopback interface address to establish a stable BGP neighbor relationship.
    C. BGP So0, which is used to prevent routes issued from a VPN site from passing through the MPLS backbone and back to that site. So0 is an extended group attribute that MP-BGP automatically generates.
    D. The routing exchange between PE-CE can be static routing, OSPF multi-instance, IS-IS multi-instance, or EBGP.

  • Question 588:

    WRED is configured on the newly deployed router HW. What is the correct description of the WRED features below? (Choose two)

    A. WRED can set different drop thresholds and packet loss rates for packets of different priority
    B. When the flow exceeds the minimum threshold, WRED begins to discard all inbound traffic (tail drop)
    C. Avoids global synchronization by selectively dropping multiple TCP streams
    D. Low-bandwidth traffic is easier to drop than high-bandwidth traffic

  • Question 589:

    DRAG DROP

    Complete the basic processing procedure for DiffServ model-based QoS shown in the figure.

    Select and Place:

  • Question 590:

    Given the scenario where switches S1, SW, and SN3 are connected, with SW1 as the root bridge and link congestion between S1 and SW2 causing SWD to not receive configuration BPDUs from the root bridge, which spanning tree protection mechanism should the administrator configure to prevent problems caused by link congestion?

    A. Root Protection
    B. Prevent STC-BPDU Attacks
    C. BPDU Protection
    D. Loop Protection

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