Free Huawei H12-891 Practice Questions & Answers 2026 Part3 | HCIE-Datacom

The following about BGP routing, describing the error, is ?

Which of the following statements about the multicast address used by OSPFv3 are correct?

The naming of SRv6 instructions complies with certain rules. You can quickly determine the function of an instruction based on the instruction name. Which of the following statements about the keywords in SRv6 instruction names are correct? (Select all that apply)

Protocols with TCP ports 443, 179, 137, 110, and 23 are, in order: radio

XLAN uses BGP EVPN to establish a tunnel, what type of message is used? ( Single choice questions).

You want only his telnet stream to be able to access the server (address 1011.100). Then, you add the following ACL to the routing ring: nule5pemit cp source ny destination 1011.100000destination-porteq 23 rule 1l0 deny ip source any destination any Then you apply that ACL to the ingress direction of the router's seial interface. What type of message is allowed to pass through the router?( Multiple choice questions).

By default, the domain ID of an OSPF process is the same as the process ID. You can run the domain-id command in the OSPF process view to change a domain ID.

Regarding the mpLS handling mode of TTL, is the following description correct?

IPsec uses an asymmetric encryption algorithm to encrypt the symmetric algorithm key, which it uses to encrypt/decrypt data, ensuring security and performance.

Router HW enables OSPF and router HW has the role of ABR and is configured with abr- summary, then which class LSA Will it be aggregated?

The following message about the Register in PIM-SM describes the correct ?( Multiple choice questions).

How do IGMPv2 routers maintain cinderband group membership? Multi-select

The correct description of the scene shown in the following figure is:

OSPF fast convergence is an extended feature to improve the convergence speed of routing, in which PRC works by speeding up routing computation by performing path calculations only on the affected nodes when the network topology changes.

Although the STP protocol can solve the loop problem, it affects the quality of user communication due to the slow convergence of the network topology. RSTP has made many improvements to STP, which of the following is not an improvement of RSTP to STP?

Regarding the description of the BGP neighbor, the error is:

The correct description of configuring BGP4+ is that

The HTTP protocol is based on TCP, so http Flood attacks can be defended against HTTP Flood attacks using the TCP Flood attack prevention method.

What is the router ID length supported by OSPFv3?

The following statement about IPSec VPN is correct ?qo

In the firewall hot standby scenario, when VGMP works in load balancing mode, which of the following functions must be enabled on the firewalls to prevent the return traffic from being discarded because it does not match any session entry in the case of inconsistent forward and return paths?

If a router only needs to forward iPv6 packets, you do not need to configure any IPV4 agreementsand addresses on that router.

Exhibit: The following figure shows the inter-AS MPLS VPN Option C (solution 2). RRs are deployed, and no traffic passes through the RRs during forwarding. If a data packet sent from PE2 to 192.168.1.1 carries two labels, which of the following statements about the two labels are correct? Understanding Inter-AS MPLS VPN Option C (Solution 2) In MPLS L3VPN Inter-AS Option C, the Route Reflectors (RRs) are used for VPN route distribution but do not participate in data forwarding. The traffic forwarding path is based on MPLS labels assigned at different routers. Each data packet carries two MPLS labels: Transport Label (T1) -- Used for forwarding within the backbone. VPN Label (V1) -- Used for VPN route identification. Breaking Down the Labels: VPN Label (V1) -- Allocated by PE1 (Answer: C ) V1 (Inner Label) is the VPN label assigned by the egress PE router (PE1). This label ensures that when the packet reaches PE1, it knows how to forward the traffic to CE1 (192.168.1.1). Transport Label (T1) -- Allocated by P2 (Answer: B ) T1 (Outer Label) is the transport label assigned by P2 to forward the packet across the AS core. This label ensures the packet reaches the next-hop router (ASBR-PE1 in AS100). Why Are the Other Options Incorrect? A. 'T1 is allocated by RR2' (Incorrect) RR2 is used only for route reflection; it does not participate in label allocation or forwarding. D. 'V1 is allocated by P2' (Incorrect) P2 is an intermediate router and does not allocate VPN labels. VPN labels are always assigned by the egress PE router (PE1 in AS100). Reference: Huawei HCIE Datacom -- MPLS L3VPN Inter-AS Option C

Compared to IPV4 multicast, which of the following descriptions is the characteristic of IP6 multicast?

To achieve an on - machine migration in the BGP EVPN distributed gateway scenario, which of the following messages is required?

Which of the following options can affect the establishment of IBGP neighbors?

For telemetry data push, data can be transferred between devices and collectors using the TLS protocol. TLS must be configured for data encryption if data is pushed based on gRPC.

Because BGP is an EGP routing protocol, BGP routing policies can only be deployed between EBGP neighbors, and routing policies between IBGP neighbors are not valid.

The following message about the Register in PIM-SM describes the correct ?( Multiple choice questions).

Regarding the Stub region and the Totally Stub region of the OSPF protocol, the following statement is correct (multiple choice)

LDP and IGP linkage refers to the release of IGP and TD routes to ensure that LDP and IGP linkage complete network efficiency, so that KGP and LDP maintains a consistent path, minimizing traffic loss, thereby improving the reliability of the entire network.

What is the wrong description of the function of OSPFv3 protocol authentication?

A company network runs the OSPF protocol, a project in order to understand the OSPF mechanism inthe network to perform packet transfer operations, the following description of ospf messages iscorrect?

Which of the following DNS resource records are legitimate?

As a network administrator, which of the following protocols can I use for network device configuration?

Is the following correct statement for the VXLAN message?

As shown in the figure, what is known about the default routes on R4? Routing Table on R4: display ip routing-table protocol isis Destination/Mask Proto Pre Cost Flags NextHop Interface 0.0.0.0/0 ISIS-L1 15 10 D 10.1.24.1 GigabitEthernet0/0/1 ISIS-L1 15 10 D 10.1.34.1 GigabitEthernet0/0/0 172.16.1.2/32 ISIS-L1 15 10 D 10.1.24.1 GigabitEthernet0/0/1 172.16.1.3/32 ISIS-L1 15 10 D 10.1.34.1 GigabitEthernet0/0/0

If the Option field value in the 0SPFv3 Hello message issued by the router's GIgabit Ethermet0/0 interface is 0x000013, the following description is correct

The following description of the link state protocol is plausible?

As shown in the following figure, a part of the LSDB LSDB of a router LSDB is shown in the first one in the following figure. A new LSP has been received, the second one in the figurebelow, and the following statement is incorrect (single choice).

The display current-configuration command displays the running configurations in memory.

In DU label advertisement mode, if the liberal label retention mode is used, the device reserves labels received from all the LDP peers regardless of whether the LDP peer is the optimal next hop for reaching the destination network. In MPLS LDP (Label Distribution Protocol), label retention modes control how labels are stored in the Label Forwarding Information Base (LFIB). DU Label Advertisement Mode (Downstream Unsolicited): Labels are advertised to all LDP peers without a request. The receiving router decides which label to use for forwarding. Liberal vs. Conservative Label Retention: Liberal Label Retention Mode (Correct Answer) All received labels from all LDP peers are stored. Even if a peer is not the optimal next hop, its label is retained. Allows faster convergence during failures. Conservative Label Retention Mode Only the label from the best next-hop peer is stored. Reduces memory usage but can slow down convergence in case of failure. Reference from Huawei HCIE-Datacom Documentation: Huawei MPLS LDP Configuration Guide -- Liberal vs. Conservative Label Retention HCIE-Datacom Training Material -- Label Advertisement in MPLS Networks

How do 8021w and 8021D handle BPDUs?( Confirmed) The

As shown in the figure, there are two IP6 networks that can access the IPv4 network, and the IPsec tunnel needs to be established between the two IPv6 networks to communicate, which of the following requirements? (). Single choice questions).

Which of the following tools cannot be referenced directly by the If-match clause in Route-policy?

If a DR needs to be elected between multicast routers running PIM-SM to be responsible for the sending and receiving of source or member multicast data, which one is described correctly below for the DR election rule?

Which of the following items are included in static information collection and analysis?

A lot of overwave techniques have emerged in the process of replacing the IPV4 addresses used in the network with lP6 addresses. These technologies are divided into two categories, one is IP4IPV6 coexistence technology, the other is PA/IP>6 interoperability technology, which of the following options sleep in IPv4/IPv6 coexistence technology?

The IS-IS Level-1 neighbor relationship is not established between R3 and R4. Referring to the following information, what is the possible cause?

Which of the following messages does the BGP protocol support?

A VRRP virtual router configuration VRID is 3 and the virtual IP address is 100 1. 1. 10, so what is the virtual MAC address?

A home user has opened a 1Mb/s bandwidth, and in order to improve the user experience, the operator can stabilize 2Mb/s when measuring speed If we use the listening bucket technology to achieve this requirement, which of the following methods is optimal.

The switch can suppress traffic by suppressing traffic and extremely other failures can affect operations, which of the following traffic suppression configurations is the wrong configuration

SSH must be configured before you can enable NETCONF on Huawei network devices.

On a virtualized network deployed using iMaster NCE-Campus, after creating VNs, you need to configure inter-VN communication. Which of the following configurations is used to achieve VN communication?

After BGP introduces routes for other protocols, the next hop in the BGP routing table is consistent with the next hop of the introduced routing protocol

Protocols with TCP ports 443, 179, 137, 110, and 23 are, in order: radio

CMPv6 uses the Type field to identify the message type, and according to the value of the type field, we can divide the ICMPv6 message into two categories, one is the error message and the other is the information message

CMPv6 uses the Type field to identify the message type, and according to the value of the type field, we can divide the ICMPv6 message into two categories, one is the error message and the other is the information message

SSH uses asymmetric encryption algorithms AES and DES to achieve security for data transmission, and uses HMAC to ensure the complete integrity of integer data

What can be determined from the following figure?

The following statement about the alliance is correct?( Single choice questions).

In the description of the MAC address spoofing attack, the error is ? Radio

A home user has opened a 1Mb/s bandwidth, and in order to improve the user experience, the operator can stabilize 2Mb/s when measuring speed If we use the listening bucket technology to achieve this requirement, which of the following methods is optimal.

SSH uses asymmetric encryption algorithms AES and DES to achieve security for data transmission, and uses HMAC to ensure the complete integrity of integer data

MSTP switches treat RSTP switches as MSTP domains, MSTP, which are formed by a single switch The interchange resolves the RSTBPDU to MSTBPDU, where IRPC is 0

Link state information is isolated by default between different IS-IS processes on the same router.

How do IGMPv2 routers maintain cinderband group membership? Multi-select

The following statement about the Security Alliance SA in IPSec is wrong with ?

Regarding the difference between NSR and NSF, the correct one is?

The following is an error in the OSPF routing calculation (single choice).

IPv6 introduces the Solicited-Node address, which is described correctly below (multiple choice)

BGP routing policies can control the publication and acceptance of routes

As shown in the figure, three switches S1, SW, and SN3, where SWI is the root bridge, andlink congestion occurs between SI and SW2, SWD cannot receive the configuration BPDU sent by the root bridge, which spanning tree protection mechanism does the administrator need to configure to prevent the problem caused by link congestion?( Single choice questions).

In DU label advertisement mode, if the liberal label retention mode is used, the device reserves labels received from all the LDP peers regardless of whether the LDP peer is the optimal next hop for reaching the destination network.

The HTTP protocol is based on TCP, so http Flood attacks can be defended against HTTP Flood attacks using the TCP Flood attack prevention method.

In VXLAN scenarios, what features can be turned on to reduce flooding of ARP messages between VTEPs?( Multiple select).

Huawei's two switch SWA, SWB is connected together through 7 Ethernets, and static route aggregation is configured, and the corresponding ports on the switch SWA are E1/0/1, E1/02, E1/0/3, E1/0/4, E1/ 0/5, E1/0/6, E1/0/7, configured sequentially as if switch SWA, SWB Each aggregation group supports only 6 ports.

In order to reduce the number of OSPF routes in certain areas, the OSPf protocol has developed special area functions, and the following description of the characteristics of OSPF special areas is correct

The address resolution feature for NDP in the following description is incorrect?

Among the routing policy tools commonly used by BGP, which ones can be used to filter routes?

By default, the domain ID of an OSPF process is the same as the process ID. You can run the domain-id command in the OSPF process view to change a domain ID.