Huawei H12-891 Online Practice Questions and Exam Preparation

Huawei H12-891 Online Questions & Answers

• Question 1:

  If the topology of the entire network does not change, but the allocation of IP segments in the router changes, ISIS only uses PRC to calculate the changed routing information and does not recalculate the entire SPT.

  A. True
  B. False
  A. True

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• Question 2:

  When an SSH client logs in to an SSH server that is configured only with username and password authentication in SSH mode, the key exchange phase is not involved (no key is generated).

  A. TRUE
  B. FALSE
  B. FALSE

• Question 3:

  In a network, the same gigabit running IS-IS and OSPF anti-tampering and flapping as shown in the figure, on the two border routers RTB and RTC, routes are introduced into the routing table. The device question is to use gigabit one port strobe, and the network 222.2.2.0/32 is introduced into OSPF via "import-route direct" on the RTD. Assuming that all other configurations are default, then which description of this network is incorrect?

  

  A. Adjusting the ISIS priority to 160 on the RTB avoids suboptimal routing problems in the network.
  B. On the RTC, the following configuration is adopted: only the routes of the 222.2.2.0/32 CIDR block can be filtered out when routing is introduced. IRTCip ip-prefix 10 index 1 deny 2.0.0.0/8 less-equal 32.
  C. RTB learns that the routing next hop for the 222.2.2.0/32 network segment is RTA.
  D. The following configuration can filter out the routes of the 222.2.2.0/32 CIDR block when RTD introduces OSPF routes.
  B. On the RTC, the following configuration is adopted: only the routes of the 222.2.2.0/32 CIDR block can be filtered out when routing is introduced. IRTCip ip-prefix 10 index 1 deny 2.0.0.0/8 less-equal 32.

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• Question 4:

  If the receive cache of a switch's gigabit Ethernet interface is full, which protocol does the switch use to request that the remote interface delay sending data frames for a period of time?

  A. 802.3af
  B. 802.1U
  C. 802.1D
  D. 802.3
  E. 802.3x
  E. 802.3x

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  Explanation

• Question 5:

  In addition to stateless address autoconfiguration, IPv6 devices can also obtain addresses, gateways, DNS, and other information through DHCPv6.

  A. True
  B. False
  B. False

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• Question 6:

  What are the benefits of using WRED?

  A. Provides some low latency
  B. Avoids TCP global synchronization
  C. Avoids congestion completely
  D. Provides a small bandwidth guarantee
  E. Can avoid UDP occupying most of the bandwidth when congested
  C. Avoids congestion completely

• Question 7:

  The MAC address of a PC is 5489-98FB-65D8. The administrator wants this PC to get the specified IP address 192.168.1.11/24 from the DHCP server. So the administrator-configured command should be:

  A. dhcp static-bind ip address 192.168.1.11 mac-address 5489-98FB-65D8
  B. dhcp static-bind ip address 192.168.1.11 24 mac-address 5489-98FB-65D8
  C. dhcp server static-bind ip address 192.168.1.11 255.255.255.0 mac-address 5489-98FB-65D8
  D. dhcp server static-bind ip address 192.168.1.11 mac-address 5489-98FB-65D8
  D. dhcp server static-bind ip address 192.168.1.11 mac-address 5489-98FB-65D8

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• Question 8:

  On a small- or medium-sized campus network deployed based on the Huawei CloudCampus Solution, an AR functioning as the egress gateway supports web- based network management, registration center query, and DHCP Option 148- based deployment, but does not support CLI-based deployment.

  A. TRUE
  B. FALSE
  B. FALSE

• Question 9:

  Which of the following descriptions about the extended features of ISIS is correct? (Choose three)

  A. When the amount of information in the Link State Protocol Data Unit (PDU) to be released by ISIS is too large, the ISIS router will generate multiple LSP shards to carry more ISIS information.
  B. ISIS can choose whether to authenticate incoming SNP and LSP packets.
  C. If there are other vendors' devices on the network that do not support the LSP sharding function, the sharding expansion mode must be configured as Model-1; otherwise, the message will not be recognized by other vendors' devices.
  D. After enabling the LSP shard extension feature on your router, you can use it without restarting the ISIS process.
  A. When the amount of information in the Link State Protocol Data Unit (PDU) to be released by ISIS is too large, the ISIS router will generate multiple LSP shards to carry more ISIS information.
  B. ISIS can choose whether to authenticate incoming SNP and LSP packets.
  C. If there are other vendors' devices on the network that do not support the LSP sharding function, the sharding expansion mode must be configured as Model-1; otherwise, the message will not be recognized by other vendors' devices.

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• Question 10:

  If the number of MAC addresses learned on an interface enabled with port security reaches the upper limit, which of the following actions may the switch take?

  A. Discards packets with unknown source MAC addresses without generating any alarm.
  B. Sets the interface state to error-down without generating any alarm.
  C. Discards packets with unknown source MAC addresses and generates an alarm.
  D. Sets the interface state to error-down and generates an alarm.
  D. Sets the interface state to error-down and generates an alarm.