Huawei Huawei Certifications H12-891 Questions & Answers

• Question 241:

  The following description of the CHAP authentication function in the PPP protocol is correct?( Multiple choice questions).

  A. The user name must be configured under the authenticated party interface for CHAP authentication

  B. If the authenticator does not have a username configured, password

  C. can also be configured without the authenticated party interface Using the authentication sequence ID, random number, and key, a Hash value

  D. is calculated using the MD5 algorithm Three message interactions are required for authentication, and only the user name is transmitted on the network without the password

  Correct Answer: ACD

• Question 242:

  The following is the correct statement about the LSA of OSPFv3?

  A. Inter-AreaPrefix-SA's LinkStatelD contains the prefix

  B. Router-LSA and Network-LSA does not contain routing information

  C. When the Intra-AreaPrefixLSA's ReferencedLinkStateType-2, referencedLinkStatelD contains the interface to DR ID

  D. Inter-AreaPrefirLSA also contains LinkLocal information file

  Correct Answer: BC

• Question 243:

  When judging the old and new LSA, the serial number parameter and the age parameter are used , and the following two parameters are correct for ?( Multiple choice questions).

  A When the router receives two LSAs, where the sequence number is the same and the checksum is the same, the smaller the age, the better

  A. When the router receives--The age of the LSA is set to 3600S, the LSA is unavailable

  B. If the serial number of the LSA reaches the end value of Ox7FFFFFFF, the current router advertises an LSA with an age of 3600S

  C. Both the serial number and age parameters can determine whether the LSA is old or new, and the router prioritizes the sequence to participate in the teaching, and the larger the better

  Correct Answer: C

• Question 244:

  The Layer 3 logical interface on XLAN L3 Gateway that enables communication between different VXLAN virtual networks is ?

  A. Layer 2 sub-interface

  B. NVE interface

  C. VBDIF interface

  D. VLANIF interface

  Correct Answer: C

• Question 245:

  The Next Header field information exists only in the header of an IPv6 message and is used to indicate whether an extended header exists for IPv6

  A. True

  B. False

  Correct Answer: B

• Question 246:

  The default configured switch has an empty MAC address table at this time , and Host A connected to the switch issues the first unicast data frame, so what will the switch do after receiving the teaching system? ( Single choice questions).

  A. The switch will drop the data frame

  B. The switch records the source MAC address of the data frame and floods the data frame

  C. The switch will forward data to interface

  D. based on the mesh MAC address of the data frame The switch caches the data frame and waits for the destination host to send the effect frame before forwarding it

  Correct Answer: B

• Question 247:

  Auto-negotiate mode is to obtain the maximum interface rate and operating mode, the network administrator configures all Ethernet interface rates of a working switch to 10OMbps, and the operating mode is configured as Full-duplex, when a network card is configured After the auto-negotiate workstation is connected to the switch, the negotiation result is that the interface rate is 10OMbps and the working mode is half-duplex, which of the following explanations is the most reasonable for this phenomenon?

  A. The problem is on the workstation's NIC, mostly due to the aging of the NIC driver on the workstation , which causes the workstation NIC to learn the interface rate and operating mode configured on the switch

  B. Port rate negotiation is negotiated through the initial port sending FLP , and the operating mode is not negotiated through FLP

  C. STP initializes the port into the blocking state, causing auto-negotiation to fail, so the port should be configured as an edge port

  D. At higher port rates and operating modes, the workstation's network interface card cannot be configured as auto-negotiate

  E. Auto-negotiation is not configured on the switch, resulting in the switch not being able to send FLP messages to the workstation, causing the workstation to set its own operating mode to Half-duple

  Correct Answer: E

• Question 248:

  IS-IS supports the processing and computation of IPv6 routes by adding ATLPs to carry IPv6 addresses and reachability information.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 249:

  What is the following description of LDP reliability?

  A. LGP GR (Graceful Restart) takes advantage of the high difference between the LS forwarding plane and the control plane to realize that the device forwards without interruption when the protocol is restarted or the master-standby is reversed

  B. Manually configured LDP FRR policy defaults to a 32-bit backup route that triggers LDP to establish a backup ISP

  C. The LDP ERR can also generate an ISP for a tag map from a non-optimal next hop, and create a forwarding table entry as a backup of the primary LSP

  D. LDP and LGP linkage, the need for IGP to suppress the release of routes, to ensure that LDP and LGP paths are consistent

  Correct Answer: B

• Question 250:

  Regarding the Stub region in the OSPF protocol , the following statement is correct.

  A. ASBR cannot exist in the Stub zone

  B. Virtual connections cannot traverse the Stub region.

  C. Injecting typeT LSA

  D. backbone areas that are not allowed in Stub regions cannot be configured as Stub regions.

  Correct Answer: ABCD