Huawei H12-891 Online Practice Questions and Exam Preparation

Huawei H12-891 Online Questions & Answers

• Question 221:

  The Option field in OSPFv3 appears in all LSAs.

  A. True
  B. False
  B. False

• Question 222:

  Regarding MP-BGP, which of the following descriptions is incorrect?

  A. MP-BGP needs to assign a private label to the VPNv4 route.
  B. If the PE and CE exchange routes through BGP, you need to create a BGP process on the CE for each VPN instance.
  C. The message type and VPNv4 route advertisement policy for MP-BGP are the same as for BGP-4.
  D. MP-BGP advertises VPNv4 routes using two attributes: MP_REACH_NLRI and MP_UNREACH_NLRI.
  B. If the PE and CE exchange routes through BGP, you need to create a BGP process on the CE for each VPN instance.

  ---

  Explanation

• Question 223:

  FILL IN THE BLANK

  AH is an IP-based transport-layer protocol. The protocol number is _____. (Enter only digits.)

  51

• Question 224:

  The link quality of a company's network is poor, and frequent failures lead to route oscillation and occasional routing loops. To prevent these phenomena from recurring, the network administrator decided to deploy URPF throughout the network to improve stability.

  A. True
  B. False
  A. True

• Question 225:

  In an MPLS domain, LSRs can be classified into ingress, transit, and egress LSRs based on how they process data. For the same FEC, an LSR can be both an ingress and a transit LSR of the FEC.

  A. TRUE
  B. FALSE
  B. FALSE

• Question 226:

  Which of the following headend behaviors can insert SRHs into IPv6 packets? (Choose three)

  A. H.Encaps.Red
  B. H.Insert
  C. H.Encaps
  D. H.Insert.Red
  B. H.Insert
  C. H.Encaps
  D. H.Insert.Red

• Question 227:

  Which of the following statements correctly describe the prefix list? (Choose two)

  A. The prefix list is used to filter IP prefixes and can match both prefix numbers and prefix lengths.
  B. The prefix list is used to filter IP prefixes, but it cannot match both the prefix number and the prefix length.
  C. The prefix list cannot be used for packet filtering.
  D. The prefix list can be used to filter packets.
  A. The prefix list is used to filter IP prefixes and can match both prefix numbers and prefix lengths.
  C. The prefix list cannot be used for packet filtering.

  ---

  Explanation

• Question 228:

  Regarding the description of the encapsulation format of the labels in MPLS, which of the following is correct? (Choose two)

  A. The TTL field in the label has a similar meaning to the TTL (Time To Live) in the IP packet, and also has the effect of preventing loops.
  B. The total length of an MPLS single tag is 4 bytes (32 bits).
  C. For Ethernet, PPP packets, the tag stack is like a "cushion layer", located between the Layer 2 header and the data, and when there is a VLAN tag, the MPLS header is placed on the Ethernet header and VLAN tag in between.
  D. The label in the S field, L-bit, is used to identify whether the label is a bottom label, and a value of 1 indicates that it is the penultimate label.
  A. The TTL field in the label has a similar meaning to the TTL (Time To Live) in the IP packet, and also has the effect of preventing loops.
  B. The total length of an MPLS single tag is 4 bytes (32 bits).

  ---

  Explanation

• Question 229:

  Which of the following statements about prefix segments and adjacency segments are correct? (Choose two)

  A. A prefix SID is a local SID out of the SRGB range.
  B. An adjacency SID is an offset value within the SRGB range advertised by the source end.
  C. A prefix segment identifies the prefix of a destination address on a network.
  D. An adjacency segment identifies an adjacency on a network.
  C. A prefix segment identifies the prefix of a destination address on a network.
  D. An adjacency segment identifies an adjacency on a network.

• Question 230:

  Which of the following is the mapping between VNIs and BDs in VXLAN implementation?

  A. N:M
  B. 1:1
  C. N:1
  D. 1:N
  B. 1:1