Huawei H12-891 Online Practice Questions and Exam Preparation

Huawei H12-891 Online Questions & Answers

• Question 291:

  Community-filter has two types: basic community attribute filters and advanced community attribute filters. Which of the following makes the advanced community attribute filter more flexible than the basic community attribute filter when matching community attributes?

  A. IP-prefix
  B. AS-path-filter
  C. Regular-expression
  D. ACL
  C. Regular-expression

• Question 292:

  

  As shown in the figure, there are two IPv6 networks that can access the IPv4 network, and the IPsec tunnel needs to be established between the two IPv6 networks to communicate. Which of the following is required?

  A. ESP + tunnel mode
  B. AH + transport mode
  C. AH + tunnel mode
  D. None of the above options are correct
  A. ESP + tunnel mode

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• Question 293:

  Which of the following statements does not cause the flapping of a VRRP group?

  A. Too small interval between Advertisement packet transmissions
  B. Inconsistent preemption delay settings
  C. Packet loss on an interface of the backup device
  D. Flapping on the link transmitting VRRP Advertisement packets
  B. Inconsistent preemption delay settings

• Question 294:

  To build a loopless Layer 2 network, which of the following schemes is optimal?

  A. Stacking + Link Aggregation
  B. TRILL + MSTP
  C. ?? + MSTP
  D. Link Aggregation + MSTP
  A. Stacking + Link Aggregation

• Question 295:

  An SRv6 Policy can be either statically configured on a device or dynamically generated by the controller and then delivered to the device.

  A. TRUE
  B. FALSE
  A. TRUE

• Question 296:

  Although the STP protocol can solve the loop problem, it affects the quality of user communication due to the slow convergence of the network topology. RSTP has made many improvements to STP. Which of the following is not an improvement of RSTP over STP?

  A. In addition to the 3 port states, RSTP adds 2 new port roles
  B. Non-root switches running RSTP send configuration BPDUs at intervals specified by the Hello Timer, a behavior that is entirely autonomous for each device
  C. RSTP port state specification is divided according to whether the port forwards user traffic and learns the MAC address, reducing the original 5 port states to 3
  D. If a port does not receive a configuration BPDU sent by the upstream device for 4 consecutive Hello Time intervals, the device considers the negotiation with this neighbor to fail
  D. If a port does not receive a configuration BPDU sent by the upstream device for 4 consecutive Hello Time intervals, the device considers the negotiation with this neighbor to fail

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  Explanation

• Question 297:

  The figure shows an L3VPN deployed over an SRv6 BE (Best Effort) network. Based on the information displayed on PE2, which of the following statements is incorrect?

  A. An iBGP peer relationship is established between PE2 and PE1, and PE2 learns the route to 192.168.1.0/24 over this iBGP peer relationship.
  B. The instruction type corresponding to F000:2::1:79 is End.DT4.
  C. PE2 imports the route 192.168.1.0/24 using the import-route command.
  D. The router ID of the BGP process on P is 1.0.0.6.
  D. The router ID of the BGP process on P is 1.0.0.6.

• Question 298:

  In the city, that is, MPLS BGPVPN network, when the packet enters the public network forwarding, it will be encapsulated with two layers of MPLS tags. Which of the following description about the two layers of tags is incorrect?

  A. Private network tags are carried and distributed by MP-BGP when routing, and public network tags are distributed by the LDP protocol.
  B. MPLS BGPVPN uses two layers of tags: public labels (also known as outer labels) and private network labels (also known as inner labels).
  C. By default, the router assigns the same tag value to all VPNv4 routes destined for the peer.
  D. The egress PE uses the inner tag when determining which egress CE the message should be sent to.
  C. By default, the router assigns the same tag value to all VPNv4 routes destined for the peer.

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• Question 299:

  If the PIM-SM protocol is running in a multicast network, you need to configure an RP, and RP configuration is divided into dynamic RP and static RP. Which of the following configuration description of the RP is correct?

  A. When you configure Dynamic RP, you need to configure BSR as a backup of the RP.
  B. When you configure a static RP, you need to configure the BSR to advertise the RP information.
  C. When configuring a static RP, you need to specify the information for the RP on all PIM routers.
  D. When you configure Dynamic RP, you do not need to configure BSR.
  C. When configuring a static RP, you need to specify the information for the RP on all PIM routers.

• Question 300:

  Each DD message has a sequence number for data confirmation, and a DD sequence number is 2 bytes long.

  A. True
  B. False
  B. False

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  Explanation