Huawei H12-891 Online Practice Questions and Exam Preparation

Huawei H12-891 Online Questions & Answers

• Question 421:

  What are the differences between traffic policing and traffic shaping? (Choose two)

  A. Traffic shaping is applied in the inbound direction and traffic policing is applied in the outbound direction
  B. For traffic shaping, the router buffers excess packets until bandwidth becomes available
  C. The token bucket algorithm is used for traffic policing, and the SPD algorithm is used for traffic shaping
  D. For traffic policing, the buffer usage can be adjusted for traffic exceeding the CIR
  E. For traffic shaping, traffic exceeding the CIR can be adjusted using the buffer
  B. For traffic shaping, the router buffers excess packets until bandwidth becomes available
  E. For traffic shaping, traffic exceeding the CIR can be adjusted using the buffer

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• Question 422:

  In Huawei's NAC solution, which of the following cannot be used for Portal authentication?

  A. User name and password
  B. Passcode
  C. SMS verification code
  D. User's MAC address
  D. User's MAC address

• Question 423:

  IPv6 multicast introduces the concept of multicast scope. In which of the following ways is the multicast scope concept implemented? (Choose two)

  A. When the source of a multicast group sends IPv6 multicast data, the TTL value of the packet is set to limit the transmission range of the multicast group.
  B. There is a special field in the IPv6 multicast address that specifies the propagation range of multicast.
  C. Multicast scope is just a conceptual definition related to propagation range without specific technical implementation.
  D. During network configuration, the administrator uses configuration commands at the edge of the network to limit the multicast scope.
  B. There is a special field in the IPv6 multicast address that specifies the propagation range of multicast.
  D. During network configuration, the administrator uses configuration commands at the edge of the network to limit the multicast scope.

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  Explanation

• Question 424:

  As shown in the figure, SWA and SWB run the STP protocol, and the Path Cost remains at the default value without modification. Which of the following statements is correct?

  

  A. GE0/0/1 on SWB is an Alternate port
  B. GE0/0/2 on SWB is an Alternate port
  C. GE0/0/1 on SWA is a Backup port
  D. SWB will become the root bridge
  B. GE0/0/2 on SWB is an Alternate port

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• Question 425:

  In an intra-domain MPLS VPN network, when a packet enters the public network and is forwarded, it is encapsulated with two layers of MPLS tags. Which of the following description about the two layers of tags is incorrect? (Choose two)

  A. The outer label of MPLS VPN is assigned by the LDP protocol or statically, and the inner label is assigned by the MP-BGP neighbor of the peer
  B. The outer label of MPLS VPN is called a private network label, and the inner label is called a public network label
  C. The outer label is used to correctly send packets to the appropriate VPN
  D. On the PE device, by default, the outer label is ejected before the packet is forwarded to the last hop device
  B. The outer label of MPLS VPN is called a private network label, and the inner label is called a public network label
  C. The outer label is used to correctly send packets to the appropriate VPN

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• Question 426:

  VXLAN is based on UDP encapsulation, which encapsulates Ethernet data frames on top of UDP in IP packets, so it is called MAC-in-UDP encapsulation.

  A. True
  B. False
  A. True

• Question 427:

  Which of the following are application optimization functions in the Huawei SD-WAN Solution? (Choose four)

  A. Application identification
  B. Intelligent traffic steering
  C. WAN optimization
  D. QoS
  A. Application identification
  B. Intelligent traffic steering
  C. WAN optimization
  D. QoS

• Question 428:

  How do IGMPv2 routers maintain group membership? (Choose two)

  A. The router queries a specific group.
  B. The router maintains a timeout timer for each group membership, refreshes the timer if a Report message is received from the receiver host, and deletes the group membership if the timer times out.
  C. The router periodically sends a Query message, and after the receiver host receives the Query message, it sends a Report message in response.
  D. As soon as a Leave message is received, the router immediately deletes the group membership.
  B. The router maintains a timeout timer for each group membership, refreshes the timer if a Report message is received from the receiver host, and deletes the group membership if the timer times out.
  C. The router periodically sends a Query message, and after the receiver host receives the Query message, it sends a Report message in response.

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  Explanation

• Question 429:

  As shown in the figure, Department A of Branch 1 has access to the Internet, but Department B can only use an encrypted VPN to access headquarters resources. NAT can be configured on the egress device so that Department A can access the Internet, while the IPsec VPN (ESP protocol) + Tunnel mode configured for Department B allows it to access headquarters.

  A. True
  B. False
  A. True

• Question 430:

  An SRLB is a set of user-specified local labels reserved for SR-MPLS. These labels are locally configured and have only local significance. Therefore, they are not advertised through the IGP.

  A. TRUE
  B. FALSE
  A. TRUE