Huawei H12-891 Online Practice Questions and Exam Preparation

Huawei H12-891 Online Questions & Answers

• Question 791:

  Port isolation can be deployed on an Ethernet network to implement both Layer 2 communication and Layer 3 isolation, making the networking more flexible.

  A. TRUE
  B. FALSE
  A. TRUE

• Question 792:

  When deploying LLQ, you must configure bandwidth parameters. What is the significance of these bandwidth parameters?

  A. They provide a built-in policer to limit the maximum available bandwidth of the low-latency queue during congestion.
  B. The parameter should be as small as possible. It means that the bandwidth is always preserved, and even if LLQ is configured, changing the parameter will reduce the available bandwidth of the interface.
  C. It represents a reference CIR used to calculate the burst size of the built-in token bucket.
  D. Changing the parameter is optional because LLQ always takes precedence over other queues.
  A. They provide a built-in policer to limit the maximum available bandwidth of the low-latency queue during congestion.

  ---

  Explanation

• Question 793:

  Which of the following descriptions about VLANs in Ethernet is correct?

  A. VLANs do not support bulk creation on devices.
  B. The range of VLANs is 0 to 4096.
  C. The default reserved VLANs for Huawei devices are 4000~4010.
  D. VLANs can be extended through QinQ technology.
  D. VLANs can be extended through QinQ technology.

  ---

  Explanation

• Question 794:

  IGMP SSM Mapping is bound to multicast through a static multicast source, allowing IGMPv1 and IGMPv2 members to access an SSM multicast network. Which of the following statements about IGMP SSM Mapping is wrong?

  A. The multicast address range of SSM is 232.0.0.0–232.255.255.255
  B. IGMP SSM Mapping does not process report messages from IGMPv3 to ensure that any IGMP version can run on the same subnet
  C. IGMP hosts can make SSM services run IGMPv3 on the multicast router interface connected to the subnet where the member host is located
  D. If the IGMP SSM Mapping feature is not enabled, neither IGMPv1 nor IGMPv2 supports multicast for deploying SSM
  B. IGMP SSM Mapping does not process report messages from IGMPv3 to ensure that any IGMP version can run on the same subnet

  ---

• Question 795:

  A network administrator needs to retrieve a token ID from iMaster NCE using the following Python code:

  import requests

  nbi_name = "[email protected]"

  nbi_pwd = "qqcOVcVel@"

  host = "139.9.213.72"

  port = "18002"

  URI = "/controller/v2/tokens"

  post_token_url = "https://" + host + ":" + port + URI

  headers_post = {'Content-Type': 'application/json', 'Accept': 'application/json'}

  r = requests.post(post_token_url,

  headers=headers_post,

  json={"userName": nbi_name, "password": nbi_pwd},

  verify=incorrect)

  Which of the following statements is incorrect?

  A. You can run print(r.json()) to display the response message returned from the server.
  B. Token resources are located at https://139.9.213.72:18002/controller/v2/tokens.
  C. The HTTP request uses the GET method to query the token value.
  D. The request body is in JSON format.
  C. The HTTP request uses the GET method to query the token value.

• Question 796:

  As shown in the figure, AS100 has two paths to reach AS400. By default, the optimal route learned through AS300 is preferred, and the route learned through AS200 to AS400 is less preferred. Therefore, the following configuration is applied on R2. After completing the configuration, the preferred route still does not change. Which operations can be adjusted to make the configuration effective? (Choose two)

  [R2] ip as-path-filter 1 permit "400$" [R2] route-policy med permit node 10 [R2-route-policy] if-match as-path-filter 1 [R2-route-policy] apply cost 20

  

  A. Configure compare-different-as-med under the BGP process on R2
  B. Configure deterministic-med under the BGP process on R1
  C. Configure compare-different-as-med under the BGP process on R1
  D. Configure deterministic-med under the BGP process on R2
  B. Configure deterministic-med under the BGP process on R1
  C. Configure compare-different-as-med under the BGP process on R1

  ---

• Question 797:

  A loop has occurred because Spanning Tree Protocol (STP) is not enabled on the network. Which of the following symptoms may appear? (Choose three)

  

  A. A loop alarm is generated on the LAN switch.
  B. CPU usage becomes excessively high.
  C. MAC address entries flap.
  D. The host receives a large number of broadcast packets.
  B. CPU usage becomes excessively high.
  C. MAC address entries flap.
  D. The host receives a large number of broadcast packets.

• Question 798:

  FILL IN THE BLANK

  In a 6PE network, the shared explicit-null label function can be enabled on routers to reduce the number of required MPLS labels. When this function is enabled, the router assigns a single label with the value ______ (enter digits only) to all 6PE routes.

  2

• Question 799:

  For the command:

  aggregate ipv4-address { mask / masklength } [ as-set | attribute-policy route-policy-name1 | detail-suppressed | origin-policy route-policy-name2 | suppress-policy route-policy-name3 ]

  Multiple parameters can influence the summarized route and its result. Which of the following descriptions are correct? (Choose three)

  A. If as-set is configured, the AS_PATH of the aggregate route contains AS path information for all specific routes to prevent route loops
  B. If suppress-policy is configured, aggregate routes are also generated, and the if-match clause in the route-policy is used to select suppressed detail routes; detail routes that match the route-policy are still advertised to other BGP neighbors
  C. If origin-policy is configured, only detail routes that match the route-policy can participate in aggregation
  D. If attribute-policy is configured, you can change the attributes of the aggregate route
  A. If as-set is configured, the AS_PATH of the aggregate route contains AS path information for all specific routes to prevent route loops
  C. If origin-policy is configured, only detail routes that match the route-policy can participate in aggregation
  D. If attribute-policy is configured, you can change the attributes of the aggregate route

  ---

  Explanation

• Question 800:

  Regarding the description of VRRP fast switching, which option is incorrect? (Choose two)

  A. VRRP can monitor BFD sessions or EFM features. When the BFD session or EFM session state changes, the VRRP module is notified to achieve fast VRRP switching.
  B. A VRRP backup group cannot monitor Peer BFD, Link BFD, and Normal BFD at the same time.
  C. If multiple BFD monitoring configurations are applied simultaneously, the configurations are interrelated and may affect each other.
  D. When a VRRP backup group monitors Normal BFD, a change in the BFD state triggers an active/standby switchover by modifying the backup group priority.
  B. A VRRP backup group cannot monitor Peer BFD, Link BFD, and Normal BFD at the same time.
  C. If multiple BFD monitoring configurations are applied simultaneously, the configurations are interrelated and may affect each other.

  ---

  Explanation