[Dec-2025] Huawei H12-891_V1.0 Dumps - Secret To Pass in First Attempt [Q157-Q174]

[Dec-2025] Huawei H12-891_V1.0 Dumps – Secret To Pass in First Attempt [Q157-Q174]

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[Dec-2025] Huawei H12-891_V1.0 Dumps – Secret To Pass in First Attempt

Huawei H12-891_V1.0 Exam Dumps [2025] Practice Valid Exam Dumps Question

NO.157 An engineer uses 2 routers to test Pv6 services and runs OSPFV3 to achieve interconnection and interoperability of IPV6 networks The RI has access to the loopback address of R2 The engineer looks at ri’s OSPF3 routing table entry and finds that there is no route reaching the R2 loopback address It can’t be caused by which of the following?

R2 does not enable OSPFv3 on the loopback port

R2 does not advertise the loopback address

R2 in area 0 to advertise the loopback into a different OSPFv3 process

R2 does not configure the Router ID used in the OSPFv3 process

NO.158 Flavors are additional behaviors defined to enhance the End series instructions in SRv6. Which of the following End instructions can the PSP flavor be attached to?

End.X

End.BM

End.T

End

Comprehensive and Detailed Explanation:
# SRv6 (Segment Routing over IPv6) Flavors provide additional processing behaviors for SRv6 End instructions.
# PSP (Penultimate Segment Popping) Flavor:
* PSP enables the penultimate node to remove the SRH (Segment Routing Header) before forwarding the packet to the last segment.
* This reduces the processing overhead on the final segment node.
# Correct End Instructions for PSP:# (A) End.X # Cross-connect behavior between segments.# (C) End.T
# Transport encapsulation in SRv6.# (D) End # Basic SRv6 endpoint behavior.
# (B) End.BM is incorrect # This is used for Binding Segment (BSID) behavior and does not support PSP.
# Reference: Huawei HCIE Datacom – SRv6 Flavors and End Instructions

NO.159 MPLS is located between the data link layer and network layer in the TCP/IP protocol stack and can provide services for all network layer protocols.

TRUE

FALSE

MPLS Positioning in the TCP/IP Model
MPLS (Multiprotocol Label Switching) operates between the Data Link Layer (Layer 2) and the Network Layer (Layer 3).
# MPLS is protocol-independent and supports various network layer protocols (IPv4, IPv6, VPN, etc.) by using labels instead of traditional IP routing.
# How MPLS Works:
* MPLS assigns labels to packets, allowing fast forwarding based on the label rather than a routing table lookup.
* Supports Layer 3 VPNs (L3VPNs), Layer 2 VPNs (L2VPNs), and MPLS Traffic Engineering (MPLS-TE).
# Why MPLS is Between Layer 2 and Layer 3?
* MPLS adds a label between the Layer 2 (Ethernet, PPP) and Layer 3 (IP) headers, effectively creating a separate forwarding mechanism.
* Label Switching Routers (LSRs) forward packets based on labels instead of IP addresses, reducing processing time.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei MPLS Technology Guide – MPLS Architecture and Label Switching
* HCIE-Datacom Study Material – MPLS Positioning and Functionality in TCP/IP

NO.160 Regarding the FTP protocol, which of the descriptions below is correct?

In FTP Passive mode, the client completes the initialization of the TCP session for control and data

In FTP Active mode, the server tells the client which port it expects to send data on by commanding “PORT”

FTP always uses a TCP session to transmit control information and data information

FTP always uses TCP port 20 to establish a data session, and ICP port 21 to establish control will always use

FTP TCP port 21 to establish a data session, TCP port 20 to establish a control session

NO.161 In the description of the MAC address spoofing attack, the error is ? Radio

Mac address spoofing attacks cause the switch to learn the wrong mapping of Mac addresses to IP addresses

A MAC address spoofing attack causes the data that the switch is sending to the correct destination to be sent to the attacker

MAC address spoofing attacks primarily exploit the switch Mac address learning mechanism

An attacker can perform a MAC address spoofing attack by sending a forged source Mac address data frame to the switch

NO.162 The multicast protocol that can generate multicast distribution trees is ?

IGMPv2

BGP

OSPF

PIMV2

NO.163 Which of the following BGP attributes is not required in the Update message for a BGP route?

WITH

Local-Preference

AS_PATH

Origin

NO.164 Link state information is isolated by default between different IS-IS processes on the same router.

TRUE

FALSE

NO.165 Which of the following is the type of northbound API used by iMaster NCE-WAN?

NETCONF

SNMP

CLI

RESTful

Comprehensive and Detailed Explanation:
# iMaster NCE-WAN provides a RESTful API for integration with third-party applications and network automation platforms.
# Why RESTful API?
* Uses HTTP/HTTPS for communication.
* Supports JSON and XML data formats.
* Enables orchestration, monitoring, and automation.
# Why Not Other Options?# (A) NETCONF # Used for device-level configuration, not northbound APIs.
# (B) SNMP # Used for network monitoring, not northbound integration.# (C) CLI # Used for manual command execution, not API communication.
# Reference: Huawei HCIE Datacom – iMaster NCE-WAN Northbound API

NO.166 iMaster NCE-WAN is the core component of the Huawei SD-WAN Solution and is responsible for SD- WAN network management and service orchestration.

TRUE

FALSE

Comprehensive and Detailed Explanation:
# iMaster NCE-WAN is the centralized SD-WAN controller that:
* Manages SD-WAN network devices (CPEs, routers).
* Optimizes traffic steering using AI-driven policies.
* Enables automation, security, and analytics.
Thus, the statement is TRUE.
# Reference: Huawei HCIE Datacom – SD-WAN Architecture

NO.167 Drag theIPsec functionson the left to the corresponding function description on the right.

Explanation:
A screenshot of a computer AI-generated content may be incorrect.

IPsec (Internet Protocol Security) provides secure communication over IP networks through several essential functions. Let’s explain each function and its purpose:
1. Data Origin Authentication:
Description:The receiver verifies the identity of the sender.
This function ensures that the data received actually comes from the claimed source.
IPsec achieves this usingIKE (Internet Key Exchange)anddigital signatures.
TheAuthentication Header (AH)andEncapsulating Security Payload (ESP)support authentication.
Use Case:Verifying that a message claiming to be from a specific IP address is genuinely from that source.
2. Data Encryption:
Description:The sender encrypts the data, and the receiver decrypts the data.
Encryption ensuresdata confidentialityby transforming readable data (plaintext) into unreadable data (ciphertext).
Only the intended receiver with the correct decryption key can convert the ciphertext back to plaintext.
Common encryption algorithms used includeAES (Advanced Encryption Standard)andDES (Data Encryption Standard).
Use Case:Protecting sensitive data transferred over public networks.
3. Data Integrity:
Description:The receiver verifies received data to determine whether the data has been tampered with.
Ensures that the data was not altered during transmission.
Uses cryptographichash functions(e.g.,SHA-1, SHA-256) to generate amessage digest.
The digest is sent with the data and verified on the receiving side.
Use Case:Detecting any changes made to the data packet during transmission.
4. Anti-Replay:
Description:The receiver rejects duplicate data packets.
Prevents attackers from capturing packets and replaying them later.
Usessequence numbersto detect replayed or duplicated packets.
The receiver keeps asliding windowof sequence numbers to compare incoming packets.
Use Case:Blocking malicious actors from sending previously intercepted packets to disrupt communication.
Why This Mapping Is Correct:
The functions and descriptions are aligned based on the core concepts of IPsec and the roles they play in ensuring secure data transmission.
Each function addresses a specific aspect of security:authentication, confidentiality, integrity, and replay protection.

NO.168 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).

A non-sharded, port 21-accessing packet

Non-first-sharded messages that use port 23 to access the server’s message

Non-first-of-sharded messages to access other hosts

Non-first-of-its-kind packets that use port 21 to access the server

Packet answer for the first sharded or non-sharded, using port 23 to access the server

NO.169 Network Quality Analysis (NQA) is a real-time network performance detection and measurement technology.
It monitors the performance of multiple protocols running on a network. Which of the following protocols can be monitored by NQA?

SNMP

OSPF

ICMP

DHCP

Huawei’sNQA (Network Quality Analysis)provides tools to test and monitor network performance such as latency, jitter, and packet loss. The supported test types include:
ICMP- For reachability and round-trip time testing.
UDP,TCP,HTTP,FTP, etc.
DNS,VoIP,DHCP(limited to simulation, not monitoring protocol status itself) Protocols likeSNMPandOSPFarenot directly monitored by NQA, as these aremanagement or control plane protocols, not data-path or performance-measurable protocols.
Correct answer: C. ICMP

NO.170 A VGMP packet is encapsulated with a UDP header and a VGMP header. By default, a VGMP packet uses UDP port _____.

512
Explanation:
Understanding VGMP (Virtual Gateway Management Protocol)
# What is VGMP?
* VGMP (Virtual Gateway Management Protocol) is used in Huawei firewalls to manage hot standby (HRP – Hot Standby Routing Protocol).
* Ensures that the active and standby firewalls synchronize their states for high availability.
# How Does VGMP Work?
* The Active and Standby firewalls exchange VGMP packets to maintain state synchronization.
* These packets are encapsulated within UDP for transport.
* The default UDP port for VGMP is 512.
Why is the Answer 512?
# Huawei firewalls use UDP port 512 by default for VGMP communication.# This ensures that VGMP heartbeats and synchronization messages are correctly processed.
Real-World Application:
* Enterprise Firewalls: VGMP ensures failover between active and standby firewalls.
* Carrier-Grade Firewalls: Uses VGMP with HRP to achieve zero-downtime firewall redundancy.
# Reference: Huawei HCIE-Datacom Guide – VGMP and HRP High Availability Mechanisms

NO.171 Among NETCONF operations, the <config> operation may contain an operation attribute, which is used to specify an operation type for configuration data. Which of the following operation attributes isincorrect?

remove

merge

create

update

Comprehensive and Detailed In-Depth Explanation:
InNETCONF (Network Configuration Protocol), the <config> operation can includeoperation attributesto specify how configuration data is handled:
merge (B):Merges the new configuration with the existing one.
replace:Replaces the existing configuration with the new one.
create (C):Creates a new configuration node, but will fail if the node already exists.
delete:Deletes an existing configuration node.
remove (A):Removes an existing node, but if the node does not exist, it will not generate an error.
The attribute”update” (D)isnot a valid NETCONF operation attribute.
Dis the correct answer as it does not exist within theNETCONF operation attribute set.

NO.172 In the following figure, all routers are running OSPF. Given this, which of the following statements is correct?

R2 forwards the Router-LSAs generated by R1 to R3.

R2 forwards the Router-LSAs generated by R3 to R1.

R2 generates Router-LSAs only in area 0.

R2 generates Router-LSAs in both area 1 and area 0.

Comprehensive and Detailed Explanation:
R2 is anArea Border Router (ABR), meaning itconnects multiple OSPF areas(Area 0 and Area 1).
ABRs generate Router-LSAs for each area they belong to.
SinceR2 is part of both Area 0 and Area 1, it must generateRouter-LSAs (Type 1) for both areas.
R2 does not forward Router-LSAs between areas; instead, it generatesSummary LSAs (Type 3)to exchange routing information between areas.
Thus, the correct answer isD.
#Reference:Huawei HCIE Datacom – OSPF LSA Types and ABR Behavior

NO.173 Huawei Open Programmability System (OPS) provides openness and programmability capabilities for network devices and enables users to perform secondary development. To facilitate script completion, Huawei OPS provides the Python script template in which the OPSConnection class is created. The member function for creating device resources is def post(self, uri, req_data).

TRUE

FALSE

Huawei’sOPS (Open Programmability System)enables programmable interactions with devices through Python-based templates. In Huawei’s OPS Python environment:
The classOPSConnectionis used to manage device interactions.
It includes methods like:
get()
post(self, uri, req_data)# used tocreate resources
put(),delete(), etc.
This aligns with RESTful API semantics, and the post() method in the context given is used correctly.
Correct answer: A. TRUE

NO.174 A network administrator runs thedisplay telemetry subscriptioncommand on a device to check telemetry subscription information. The command output is as follows:
[~CE] display telemetry subscription
Sub-name : Sub1
Sensor group:
Sensor-name Sample-interval(ms) State
Sensor1 1000 RESOLVED
Destination group:
Dest-name Dest-IP Dest-port State Vpn-name Protocol
Dest1 192.168.56.1 20000 RESOLVED – GRPC
Sub-state : PASSIVE
Total subscription number is : 1
Which of the following statements is incorrect?

The device sends sampled data every second.

The subscription name is Sub1.

The subscription mode is static subscription.

The IP address of the device is 192.168.56.1.

Comprehensive and Detailed In-Depth Explanation:
Analyzing the output:
A: The device sends sampled data every second:Correct. Thesample interval is 1000 ms (1 second).
B: The subscription name is Sub1:Correct. Thesubscription nameis clearly shown asSub1.
C: The subscription mode is static subscription:Correct. Since theSub-stateisPASSIVE, it indicates astatic subscription.
D: The IP address of the device is 192.168.56.1:Incorrect. The IP address192.168.56.1shown in the output is thedestination IPwhere the telemetry data is sent, not the IP address of the device itself.

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