Huawei Huawei Certifications H12-891 Questions & Answers

• Question 461:

  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

  Correct Answer: A

• Question 462:

  As shown in the following figure, R1 and R2 establish a neighbor relationship with LeveL2, and the key configuration is as follows, so is the following route entry for R2 correct?

  

  A. 0::/64 The router will appear in the IP routing table

  B. 2022::/64 Routers appear in the IP routing table

  C. 2019::/64 Routers appear in the IP routing table

  D. 2021::/64 Routers appear in the IP routing table

  Correct Answer: ABC

• Question 463:

  The Serial Number field of LS is used to detect expired and duplicate LSAs. The field is a 32bt signed integer, so the small serial number is Ox8000000

  A. True

  B. False

  Correct Answer: B

• Question 464:

  What kind of scenario can use AS-path-filter?( Multiple select).

  A. A Filters routes received from BGP neighbors based on the AS PATH attribute carried by the route, such as the command peer X.x.x.x as path-filter import

  B. The apply clause in Route policy

  C. Filter routes sent to BGP neighbors based on the AS PATH attribute that the route carries. For example, the command peer x.x.x.x as path-filter export

  D. The if-match clause in Route-policy

  Correct Answer: ACD

• Question 465:

  Regarding the domain-authentication-mode md5 hello command in the ISIS process, the correct explanation is ?

  A. ISIS authentication cannot be applied in IPv6 environments.

  B. This command is mainly used to make is the ISIS Hello message carry authentication information during the transmission process.

  C. All router domain authentication methods of the same routing domain are MD5, the password is hello, and lS-IS SNP and LSP will spread normally.

  D. outing domain authentication is primarily used to allow level-1 and Level-2 SNP and LSP messages to carry authentication information during delivery.

  Correct Answer: C

• Question 466:

  What are some of the following misrepresentations about URPF, IPSG, and DAI technologies? ( Multiple choice questions).

  A. DAI does not support manual configuration of binding tables.

  B. IPSG checks the source IP address and source MAC address of the IP packet , and DAI only checks the correspondence between the IP and the MAC.

  C. URPF can be used to protect against DDoS spoofed source attacks.

  D. IPSG technology checks IP packets for source IP spoofing attack prevention, while DAI checks ARP packets to filter attack sources.

  Correct Answer: AB

• Question 467:

  RD is used to distinguish the same IP address in different VPNs, how many bits does RD contain ? (Single choice)

  A. 64

  B. 32

  C. 16

  D. 128

  Correct Answer: A

• Question 468:

  The main routing policy tools that BGP can use are Filter-policy and Route-policy, where Fate-policy can only filter routes and Route-policy can only modify routes

  A. TRUE

  B. FALSE

  Correct Answer: B

• Question 469:

  As shown in the figure, the use of redundant links between the branch and the headquarters to establish IPsecVPN, while turning on URLPF on the Router_B for traffic from branch l, which of the following options is correct?

  

  A. When using IPsec active-standby link redundant backups to enable the URPF function under the physical interface , it is recommended to use URPF loose mode.

  B. When using IPsec multilink redundant backup, the URPF function can be used under the physical interface, and URPF strict mode can be used

  C. When using IPsec multilink redundant backups, urPF can be enabled under the tunnel interface, and URPF strict mode can be used

  D. When using lPsec active-standby link redundancy backup, the URPF function is enabled under the physical interface, and URPF strict mode can be used.

  Correct Answer: AC

• Question 470:

  In order to study the working mechanism of the OSPFv3 protocol, a project to build a network topology is as follows, the configuration of R1 and R2 is as follows, please ask the LSA switched between R1 and R2 What are the types?

  A. network-LSA

  B. Router-LSA

  C. Link-LSA

  D. Inter-area-prefix-LSA

  Correct Answer: ABC