Huawei Huawei Certifications H12-891 Questions & Answers

• Question 101:

  The fields that represent priority in the VLAN (8021Q) data encapsulation are a total of 6 bits.

  A. True

  B. False

  Correct Answer: B

• Question 102:

  IS-IS is a link-state routing protocol that uses the SPF algorithm for route calculations. As shown in the figure, at the same time, a certain area has IPV4 and IPV6 and runs IS-IS to achieve network interconnection, of which R2 only supports IPV4 Regarding the topology calculation of the network, which of the following statements is correct?

  

  A. By default, IPv6 is not supported because R2 Therefore, in the shortest path tree formed by the JPv6 network computation, the path where R1 accesses R4 is: R1-R3-R4

  B. If you want the IPv4 and IPv6 networks to compute the same shortest path tree. The IPv6-enable topology lpv6 command is required to enable the Russian force of IPv6 under the IS-IS process

  C. By default, in the shortest path tree formed by the IPv6 network calculation, R1 accesses R4 as R1-R2R4, since R2 does not support IPv6 Therefore, R2 will directly drop the IPv6 packet after receiving it, and select the traffic loss

  D. By default, IPv4 and IIPV6 networks are computed separately to form different shortest path trees

  Correct Answer: C

• Question 103:

  Which of the following is incorrect about HTTPS?( Multiple Choice)

  A. HTTPS secures access to data by using SSLVPN.

  B. If the HTTPS traffic contains a virus, the router cannot detect the virus directly using IPS technology

  C. When using HTTPS to access a website, the website cannot be accessed if the user's browser does not recognize the website's digital certificate.

  D. HTTPS protocol uses TCP port 443 by default

  Correct Answer: C

• Question 104:

  What are the problems with manually creating static VXLAN tunnels in campus networks? Multi-select

  A. Although the static VXLAN tunnel mode can support distributed gateway application scenarios, the configuration workload is large and the configuration adjustment is complex

  B. N devices to establish static VXLAN tunnels, you need to manually configure up to N(N-1)/2 tunnels, the amount of configuration is large

  C. VTEP can only learn remote MAC addresses in a way that relies on data flooding

  D. Static VLAN tunnel also uses related protocols on the control plane, which will cause equipment resource loss

  Correct Answer: ABC

• Question 105:

  There is an existing switch running the RSTP protocol. If the network topology changes, what happens to the Layer 2 forwarding table that is automatically learned by the switch?

  A. All table entries are dropped

  B. Except for the table entry related to the edge port that is not deleted, all other table entries are deleted

  C. Only table entries related to the port that received the TC message are dropped

  D. If the aging time is set to 15 seconds, entries that exceed the aging time are deleted

  E. Table entries are dropped except for table entries related to edge ports and table entries related to ports that receive TC messages

  Correct Answer: E

• Question 106:

  0SPFV2 is running on the IPV4 network IGP: OSPF3 is running in the IPV6 network, OSPF35 OSPFV2 has the same message type. Includes hello messages, DOD messages, LSR messages, LAU messages, and SAX messages about OSPP The following statement is correct?

  A. The hello packet of OSPFv3 carries the IPV6 address prefix of the router interface

  B. OSPFv3 uses the authentication field of the packet header to complete the packet authentication

  C. OSPFv3 uses the link-local address as the source address for sending packets, which can be forwarded outside the range of the originating link

  D. OSPFv3 sends OSPFv3 packet using the IPV6 multicast addresses FF02::5 and FF02

  Correct Answer: D

• Question 107:

  Mainstream Layer 2 technologies such as VXLAN, TRILL, NVGRE and MPLS

  A. True

  B. False

  Correct Answer: A

• Question 108:

  The following statement about the IS-IS protocol is incorrect?

  A. The IS-IS protocol is a link-state protocol that runs between AS

  B. The IS-IS protocol supports CLNP networks

  C. Messages for the IS-IS protocol are encapsulated directly by the data link layer

  D. The IS-IS protocol supports IP network ad

  Correct Answer: A

• Question 109:

  Which of the following scenarios does not require RPF checking?( Single choice questions).

  A. When a router in PIM SM receives multicast traffic

  B. When a shared tree is established to an RP in PIM SM

  C. When a pruning message is received in PIM SM

  D. When the RP in PIM SM establishes the source tree to the multicast source

  Correct Answer: C

• Question 110:

  The following statement about the concept of multicast is wrong?

  A. Multicast Source: The sender of the message needs to join the multicast group to provide forwarding of multicast group messages

  B. Multicast router: A router or layer-three switch that supports layer-3 multicast functionality

  C. Multicast Group Members: Multicast group members can be widely distributed anywhere in the network

  D. Multicast Groups: A collection identified by ip multicast addresses

  Correct Answer: A