H12-891-HCIE Datacom latest Dumps Questions

QUESTION 1

How many bits does an MPLS label field have?

A. 8

B. 20

C. 1

D. 3

Correct Answer: B

QUESTION 2

BGP authentication can prevent unauthorized routers from establishing BGP peer relationships with routers. BGP authentication can be classified into MD5 authentication and keychain authentication. Which of the following BGP messages carry BGP keychain authentication information?

A. Update

B. Keepalive

C. Open

D. Notification

Correct Answer: ABCD

QUESTION 3

In the MPLS VPN, RD values are added to IPv4 addresses to distinguish IPv4 prefixes with the same address space. Which of the following statements are correct?

A. Each VPN instance on a PE corresponds a to a RD value. The RD on the same PE must be globally unique.

B. The RD is encapsulated into the Update packet as the BGP extended attribute.

C. After receiving IPv4 routes from a CE, a PE adds RDs to them to convert them to globally unique VPN-IPv4 routes and advertises the routes on the public network.

D. The RD can be used to control advertisement of VPN routing information.

Correct Answer: AC

QUESTION 4

Please select the default modes of MPLS label advertisement, label distribution control, and label reservation of Huawei routers, respectively.

Select and Place:

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QUESTION 5

DHCP snooping can prevent bogus DHCP server attacks. Which of the following are the required configuration steps?

A. Configure an interface as a trusted or untrusted interface.

B. Enable DHCP snooping on an interface or VLAN.

C. Enable DHCP globally.

D. Enable DAI Snooping globally.

Correct Answer: ABC

QUESTION 6

Which of the following statements are correct about the MP_REACH_NLRI attribute of BGP4+?

A. The length of the next hop address can be 16 or 32.

B. The value of the address family identifier (AFI) is 2, indicating IPv6.

C. The NLRI field carries the IPV6 route prefix and mask.

D. When the length of the next hop address is 16, the Network Address of Next Hop field carries the link-local address.

Correct Answer: ABC

QUESTION 7

Which of the following is the drop probability of packets exceeding the upper threshold in WRED?

A. 0.2

B. 1

C. 0.8

D. 0.5

Correct Answer: B

QUESTION 8

In 6PE networking, the shared explicit null label function can be enabled on routers to reduce the number of required MPLS labels. With this function, a router assigns a label with the value ______(enter only digits) to all 6PE routes.

Correct Answer: 2

QUESTION 9

Which of the following types of EVPN routes does not carry MPLS labels?

A. Ethernet segment route

B. Inclusive multicast route

C. Ethernet A-D route

D. MAC/IP advertisement route

Correct Answer: A

QUESTION 10

On the network shown, an engineer uses two routers to test IPv6 services by running BGP4+ to simulate the communication between the enterprise headquarters and a branch. Which of the following statements about IPv6 route transmission between two devices is incorrect?

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A. BGP4+ uses Update messages to transmit routing information between peers.

B. During route transmission, the Next Hop attribute must be an IPv6 global unicast address.

C. If an Update message carries the MP_ REACH_ NLRI attribute, it means that the advertised route is a

reachable route.

D. During transmission, these routes carry well-known mandatory attributes such as AS_Path.

Correct Answer: B

QUESTION 11

Which of the following operations is unnecessary to resolve a failure for hosts in the same VLAN to communicate with each other?

A. Run the display mac-address command on the switch to check MAC address entries including the MAC address, port number, and VLAN ID.

B. Run the display current-configuration command to check the PCB version and the software version of a card.

C. Run the display vlan vlan-id command in any view to check whether the VLAN for communication interfaces has been created.

D. Run the display interface interface-type interface-number command in any view to check the status of communication interfaces.

Correct Answer: B

QUESTION 12

Which of the following statements regarding OSPF neighbor relationship faults is incorrect?

A. The ExStart state indicates that two neighbor routers have inconsistent MTUs or the same OSPF Router ID (RID).

B. The Init state indicates that the router has received Hello packets from its neighbors but the received Hello packets do not contain the OSPF RID of the receiving router.

C. The Attempt state indicates that the router does not send unicast Hello packets to configured neighbors.

D. For non-DR and non-BDR routers on an Ethernet link, the 2-Way state is acceptable.

Correct Answer: C

QUESTION 13

In the following figure, OSPF is enabled on all router interfaces, and link costs are marked. The Loopback0 address of R2 is advertised in area 1. Given this, what is the cost of the route from R1 to 10.0.2.2/32?

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A. 50

B. 150

C. 100

D. 200

Correct Answer: D

QUESTION 14

The following figure shows the inter-AS MPLS VPN Option B solution. If ASBR-PE1 and ASBR-PE2 only transmit VPNy4 routes, you can run the [ASBR-PE1-bgp-af-vpnv4] undo peer 10.0.34.4 enable command on ASBR-PE1.

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A. TRUE

B. FALSE

Correct Answer: B