Huawei H12-891 Online Practice Questions and Exam Preparation

Huawei H12-891 Online Questions & Answers

• Question 471:

  K company has two types of network services: UDP-based real-time video streaming services and TCP-based FTP download services. The company's network administrator often receives complaints that the FTP download speed is slow or unstable. What are the possible causes? (Choose two)

  A. The device uses the tail drop technology. As a result, global TCP synchronization affects the FTP rate.
  B. The device performs PQ scheduling for FTP services and WFQ scheduling for video services. As a result, the FTP service bandwidth is preempted.
  C. The device limits the FTP traffic rate to a small value.
  D. The video service has a higher priority and preempts the bandwidth of the FTP service.
  A. The device uses the tail drop technology. As a result, global TCP synchronization affects the FTP rate.
  D. The video service has a higher priority and preempts the bandwidth of the FTP service.

• Question 472:

  In an MPLS BGPVPN environment, if tags are distributed only through BGP and LDP, the MPLS tags of the message can be up to two layers of tags.

  A. True
  B. False
  A. True

  ---

  Explanation

• Question 473:

  The Option field in OSPFv3 appears in all LSAs.

  A. True
  B. False
  B. False

  ---

  Explanation

• Question 474:

  As shown in the figure, all routers declare the loopback address in OSPF, where the R storage does not return the address 1022 [2 declares 100.33[ at the Ael.R3 ring E port[ 92101102A]. External routing is in order to win light, R wins L away from the negative cut. The command is as follows: (multi-select) [B] ipprefix permlt 1001.1.024 [R1] ospf1. (Choose three)

  

  A. Router R1's IP routing table does not have an external route to 1001.1.0/24.
  B. Router R1's IP routing table has an external route to 1001.1.0/24.
  C. In the IP routing table of Router R1, there is no loopback route to R1.
  D. In the IP routing table of Router R1, there is no loopback route to R3.
  A. Router R1's IP routing table does not have an external route to 1001.1.0/24.
  C. In the IP routing table of Router R1, there is no loopback route to R1.
  D. In the IP routing table of Router R1, there is no loopback route to R3.

  ---

• Question 475:

  Which of the following methods can be used to establish IPsec SAs? (Choose four)

  A. Establish IPsec SAs through template negotiation
  B. Establish IPsec SAs in IKE auto-negotiation mode
  C. Establish IPsec SAs through certificate negotiation
  D. Manually establish IPsec SAs
  A. Establish IPsec SAs through template negotiation
  B. Establish IPsec SAs in IKE auto-negotiation mode
  C. Establish IPsec SAs through certificate negotiation
  D. Manually establish IPsec SAs

• Question 476:

  Which of the following routing tools is unique to BGP?

  A. Route-policy
  B. ACL
  C. IP-prefix
  D. AS-path-filter
  D. AS-path-filter

  ---

• Question 477:

  A router receives a BGP route with the community attribute NO-EXPORT. How will the router handle this BGP route?

  A. Drop the route directly
  B. No longer advertise it to any other BGP routers
  C. Advertise it only to IBGP neighbors
  D. Advertise the route normally, but do not use it for data forwarding
  C. Advertise it only to IBGP neighbors

• Question 478:

  Regarding the OSPFv3 protocol, what is the error described below?

  A. Under the scope of a shared router, each OSPFv3 process runs independently.
  B. Multiple instances can run under the same OSPFv3 process on the same interface.
  C. It can support running multiple instances on a single link.
  D. The OSPFv3 message header will contain an instance ID field.
  B. Multiple instances can run under the same OSPFv3 process on the same interface.

  ---

• Question 479:

  WRED is configured on the newly deployed router HW. Which of the following descriptions of WRED features are correct? (Choose two)

  A. WRED can set different drop thresholds and packet loss rates for packets of different priority
  B. When traffic exceeds the minimum threshold, WRED starts dropping all ingress traffic (tail drops)
  C. Avoid global synchronization by selectively dropping multiple TCP streams
  D. Low-bandwidth traffic is easier to drop than high-bandwidth traffic
  A. WRED can set different drop thresholds and packet loss rates for packets of different priority
  C. Avoid global synchronization by selectively dropping multiple TCP streams

• Question 480:

  In the process of transitioning from IPv4 addresses to IPv6 addresses, various techniques have emerged. These technologies are categorized into two groups: IPv4/IPv6 coexistence technologies and IPv4/IPv6 interoperability technologies. Which of the following options fall under IPv4/IPv6 coexistence technologies? (Choose three) A. NAT64

  B. IPv6 over IPv4

  C. Dual Stack

  D. ISATAP

  Correct Answer. BCD
  BCD

  ---

  Explanation