Huawei H12-891 Online Practice Questions and Exam Preparation

Huawei H12-891 Online Questions & Answers

• Question 441:

  ICMPv6 has two types: Error Messages and Informational Messages.

  A. TRUE
  B. FALSE
  A. TRUE

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  Explanation

• Question 442:

  Regarding the MPLS handling mode of TTL, which of the following descriptions is correct?

  A. Pipe mode. When an IP packet passes through an MPLS network, the IP TTL minus 1 at the entry point is mapped to the MPLS TTL field
  B. MPLS labels contain a TTL, which has the same meaning as the TTL field in the IP header. TTL prevents MPLS networks from creating routing loops
  C. In Uniform mode, when an IP packet passes through an MPLS network, the inbound IP TTL is reduced by 1. The MPLS TTL field is a fixed value
  D. In MPLS VPN, if you need to hide the structure of the MPLS backbone network, you can use the Uniform mode on the ingress for private network packets
  B. MPLS labels contain a TTL, which has the same meaning as the TTL field in the IP header. TTL prevents MPLS networks from creating routing loops

• Question 443:

  Regarding the MPLS basic forwarding process, the following description is incorrect:

  A. By default, the PHP-enabled edge node assigns a label value of 3 to the inverted second-hop node.
  B. When an IP message enters the MPLS domain, the MPLS boundary device inserts a new label between the Layer 2 header and the IP header.
  C. When the IP message enters the MPLS domain, check whether the Tunnel ID value corresponding to the destination IP address is 0x00. If the Tunnel ID value is 0x00, then enter the MPLS forwarding process.
  D. The transport node device replaces the existing top-of-stack label (outermost label) with the label assigned by the next-hop device.
  C. When the IP message enters the MPLS domain, check whether the Tunnel ID value corresponding to the destination IP address is 0x00. If the Tunnel ID value is 0x00, then enter the MPLS forwarding process.

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  Explanation

• Question 444:

  As shown in the figure, ARP broadcast suppression is enabled on VTEP1 in BD 20 (VNI 200). VTEP1 has learned the ARP information of PC2 through BGP EVPN routes.

  When VTEP1 forwards the ARP request for PC1's MAC address to VTEP2 over the VXLAN tunnel, what is the destination MAC address of the inner (original) Ethernet frame?

  

  A. MAC B
  B. MAC C
  C. MAC A
  D. MAC D
  B. MAC C

• Question 445:

  Which of the following descriptions about Link ID, Data, Type, and Metric in a Router-LSA are correct? (Choose four)

  A. Metric describes the overhead of this connection.
  B. The Link ID represents the local identity of this connection, and for different connection types, the Link ID holds different meanings.
  C. Data is used to describe additional information for this connection; different connection types provide different details.
  D. Type indicates the type of connection.
  A. Metric describes the overhead of this connection.
  B. The Link ID represents the local identity of this connection, and for different connection types, the Link ID holds different meanings.
  C. Data is used to describe additional information for this connection; different connection types provide different details.
  D. Type indicates the type of connection.

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  Explanation

• Question 446:

  iMaster NCE-WAN is the core component of the Huawei SD-WAN solution and is responsible for SD-WAN network management and service orchestration.

  A. TRUE
  B. FALSE
  A. TRUE

• Question 447:

  Regarding the BGP loop protection mechanism, which of the following descriptions is correct? (Choose three)

  A. The AS_PATH attribute is used between autonomous systems to prevent loops.
  B. The Cluster_List attribute is used for loop protection within the reflector cluster, and the router rejects the route when it finds that the Cluster_List of the route entry contains its own Cluster ID.
  C. Routes learned from IBGP are not advertised to IBGP neighbors and are used to prevent routing loops inside the AS.
  D. You can use the AS_CONFED_SET attribute to prevent loops within a confederation.
  A. The AS_PATH attribute is used between autonomous systems to prevent loops.
  C. Routes learned from IBGP are not advertised to IBGP neighbors and are used to prevent routing loops inside the AS.
  D. You can use the AS_CONFED_SET attribute to prevent loops within a confederation.

• Question 448:

  If an engineer wants to remotely log in to a Huawei device, the engineer uses the Paramiko library to compile the following code when creating an SSH Python script:

  cli = ssh.invoke_shell() cli.send("screen-length 0 temporary\n")

  What is the function of the screen-length 0 temporary command?

  A. Performing automatic word wrap
  B. Performing split-screen display
  C. Canceling split-screen display
  D. Canceling automatic word wrap
  C. Canceling split-screen display

• Question 449:

  Which of the following statements is incorrect about MP-BGP?

  A. MP-BGP uses the MP_REACH_NLRI and MP_UNREACH_NLRI attributes to advertise VPNv4 routes.
  B. When PEs and CEs exchange routes through BGP, you need to create a BGP process for each VPN instance on the CE.
  C. The packet types and VPNv4 route advertisement policies of MP-BGP are the same as those of BGP-4.
  D. MP-BGP needs to allocate private network labels for VPNv4 routes.
  B. When PEs and CEs exchange routes through BGP, you need to create a BGP process for each VPN instance on the CE.

• Question 450:

  FILL IN THE BLANK

  As shown in the figure, R1, R2, R3, and R4 reside within the same MPLS domain, and LDP (Label Distribution Protocol) is used to distribute MPLS labels.

  R4 is the egress LSR for the FEC 4.4.4.0/24.

  To ensure that R4 can recognize the QoS forwarding priority of packets sent from R1 and destined for 4.4.4.0/24, and without requiring R4 to look up its LFIB (Label Forwarding Information Base),

  the outgoing label assigned by R3 for this FEC should be_____ (Enter an Arabic numeral without symbols).

  3