Huawei H12-891 Online Practice Questions and Exam Preparation

Huawei H12-891 Online Questions & Answers

• Question 151:

  Which of the following channels are involved in the Huawei SD-WAN Solution? (Choose four)

  A. Management channel
  B. Control channel
  C. Data channel
  D. Orchestration channel
  A. Management channel
  B. Control channel
  C. Data channel
  D. Orchestration channel

• Question 152:

  You need to access the subnets of different VPNs in the VXLAN network, such as information about one subnet:

  Bottom: RT=10:1ORT.100:1000 Export 1000 in the EVPN instance and RT-100-100 in the VPN instance.

  Which of the following can be used for another subnet? (Choose two)

  A. All EVPN instances are 1000:1000
  B. In VPN instances, it is 10:10
  C. 1000:1000 appears in VPN instances
  D. EVPN implements 1000:1000 export
  C. 1000:1000 appears in VPN instances
  D. EVPN implements 1000:1000 export

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  Explanation

• Question 153:

  Which of the following statements about IPSG technology is correct?

  A. The ip source check user-bind check-item command is used to configure VLAN- or interface-based IP packet checks, which take effect for both dynamic and static table entries.
  B. If an interface is configured as the OKCP Scooing Trust interface, the interface can normally receive DHCP ACK and DHCP NAK responses from the DHCP server and DHCP Offer packets. Other untrusted ports cannot receive these packets properly.
  C. On Huawei routers, IPSG functions can be configured in Vlanif.
  D. IPSG can perform binding table match checks on IP packets entering and leaving the interface.
  B. If an interface is configured as the OKCP Scooing Trust interface, the interface can normally receive DHCP ACK and DHCP NAK responses from the DHCP server and DHCP Offer packets. Other untrusted ports cannot receive these packets properly.

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• Question 154:

  An engineer used two routers to test IPv6 services and simulated the interconnection between headquarters and branches by running BGP4+. The logical network topology is shown in the figure. Regarding the delivery of IPv6 routes between the two devices, which of the following statements is incorrect?

  

  A. When a route is passed, it carries recognized mandatory attributes such as AS_Path
  B. BGP4+ passes routing information between peers via Update packets
  C. When routing information is passed, the Next_Hop attribute must be an IPv6 global unicast address
  D. If the Update message carries the MP_REACH_NLRI attribute, it indicates that the advertised route is reachable
  C. When routing information is passed, the Next_Hop attribute must be an IPv6 global unicast address

• Question 155:

  Regarding route introduction, which of the following descriptions is incorrect?

  A. BGP supports both import and network when generating routes, and the network method is more precise
  B. By default, OSPF introduces external routes with a default metric of 1, and the introduced external routes are Type 2
  C. In IS-IS, after a Level-1 router introduces a route, if the import policy is not manually configured, an incorrect route may form
  D. Introducing IBGP routes into OSPF may cause routing loops
  C. In IS-IS, after a Level-1 router introduces a route, if the import policy is not manually configured, an incorrect route may form

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• Question 156:

  If a Huawei switch runs the RSTP protocol, when will the BPDUs on a port on the switch be aged?

  A. On the interface, RSTP does not age BPDU.
  B. After more than 6 seconds.
  C. After Max Age times out.
  D. After Hello time times out.
  E. After the Forward Delay timeout.
  C. After Max Age times out.

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  Explanation

• Question 157:

  What is the significance of reserved multicast address 224.0.0.0 ~ 224.0.0.255?

  A. The multicast address range is reserved for the management of multicast addresses, and is valid locally
  B. The address identifies Global Internet, and the address range is valid for the entire network
  C. This multicast address range is reserved for the management of multicast addresses, which cannot transmit multicast traffic to the Internet
  D. Any legitimate multicast traffic and multicast application Junhui adopts an address change
  E. The multicast address range is reserved for link-local multicast traffic, including network control messages, and the address range is only valid locally
  E. The multicast address range is reserved for link-local multicast traffic, including network control messages, and the address range is only valid locally

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• Question 158:

  In a BGP/MPLS IP VPN scenario, if a PE and CE use OSPF to exchange routing information, domain IDs are used to identify whether the routes imported to VPN instances are from the same OSPF domain.

  A. TRUE
  B. FALSE
  A. TRUE

• Question 159:

  When the IPv6 address of a host is configured with stateless address configuration, and other parameters other than the address are obtained through DHCPv6, how should the M and O bits be set in the RA message?

  A. M=1 O=1
  B. M=1 O=0
  C. M=1 O=0
  D. M=0 O=1
  D. M=0 O=1

• Question 160:

  If multiple candidate RPs are configured for a multicast group, which of the following parameters must be compared when electing the RP for that group? (Choose three)

  A. The mask length of the group range for the C-RP service that matches the group address the user joined
  B. C-RP priority
  C. The IP address of the C-RP interface
  D. Number of C-RP interfaces
  A. The mask length of the group range for the C-RP service that matches the group address the user joined
  B. C-RP priority
  C. The IP address of the C-RP interface