[Aug-2026 Newly Released] Pass H12-811_V2.0 Exam - Real Questions and Answers
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Huawei H12-811_V2.0 Exam Syllabus Topics:
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NEW QUESTION # 28
The traditional Fat AP networking usually applies to WLANs of small and micro stores. For a large-scale WLAN, the WAC + Fit AP networking is typically used. Which of the following statements are true about the WAC + Fit AP networking architecture? (Select all that apply)
- A. Fit APs provide 802.11-based wireless access for STAs and function as bridges between wired and wireless networks.
- B. Users need to log in to the Fit AP to configure wireless services.
- C. The WAC controls and manages all APs on the WLAN.
- D. Layer 2 connectivity is required for the WAC and APs to communicate with each other using the CAPWAP protocol.
Answer: A,C
Explanation:
In a WAC + Fit AP architecture, the WAC (Wireless Access Controller) centrally manages and controls the Fit APs, so option A is correct. Service configurations such as SSIDs, security policies, radio parameters, and access control are generally delivered from the WAC to the APs.
The Fit AP mainly forwards wireless user traffic and executes the configuration issued by the controller.
Option D is also correct because a Fit AP provides 802.11 wireless access for stations (STAs) and serves as a bridge between the wireless side and the wired network. This is one of its basic roles in enterprise WLAN deployment.
NEW QUESTION # 29
The emergence of AI poses new requirements on data center networks. To meet AI computing requirements, a high-speed intelligent computing data center network with zero packet loss needs to be constructed. Which of the following statements are false about the requirements and solutions of intelligent computing data center networks? (Select all that apply)
- A. Due to large-scale data synchronization services on the intelligent computing network, a single port must have a high bandwidth, such as 200GE or 400GE.
- B. The RDMA protocol stack is used on the intelligent computing network to reduce the transmission latency between GPU servers and physical switches.
- C. Lossless technologies such as PFC and ECN are used on the intelligent computing network to implement a network with zero packet loss.
- D. Measures such as single-port ultra-high bandwidth and lossless network technologies can be used to achieve a network with close to zero packet loss, but not a truly lossless network.
Answer: B,D
Explanation:
The false statements are A and D. Option A is considered false in HCIA-Datacom wording because intelligent computing data center networks aim to build a lossless Ethernet fabric through coordinated technologies such as high-bandwidth interfaces, deep buffers, PFC, ECN, congestion control, and optimized forwarding. The exam-oriented knowledge point treats these technologies as solutions for a zero packet loss network design goal rather than stating that a truly lossless network cannot be achieved.
Option D is also false because RDMA is used to reduce end-to-end communication latency and CPU overhead between servers, especially for east-west traffic in AI and high-performance computing clusters. It is not specifically described as reducing latency between GPU servers and physical switches. That wording is inaccurate.
NEW QUESTION # 30
On a switched network where STP is enabled on all devices, when a downstream device detects a topology change, it continuously sends configuration BPDUs to the upstream device until the root bridge is informed of the topology change.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
This statement is false . In classic STP, when a non-root switch detects a topology change, it does not continuously send configuration BPDUs upstream to notify the root bridge. Instead, it sends a Topology Change Notification (TCN) BPDU toward the root bridge through its root port. Each upstream switch acknowledges the TCN and forwards it further until it reaches the root bridge.
After the root bridge receives the topology change notification, the root bridge sets the Topology Change (TC) flag in its configuration BPDUs, and those configuration BPDUs are then propagated throughout the network. Therefore, topology-change notification and normal configuration BPDU transmission are different functions. The statement is wrong because it confuses TCN BPDUs with configuration BPDUs , and also inaccurately describes the notification behavior. HCIA-Datacom requires learners to distinguish between these BPDU types and understand how STP reacts to topology changes by accelerating MAC address aging and informing the network through the root bridge. This process helps the Layer 2 topology converge and reduces long-lasting forwarding inconsistencies after a link or port-state change.
NEW QUESTION # 31
The administrator configures an Eth-Trunk in LACP mode between two switches, and sets the maximum number of active links in the Eth-Trunk to 3 and the number of remaining standby links to 1. If one of the active links fails, the two switches automatically adjust the number of active links to 2 through negotiation, and the standby link remains in the standby state.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
This statement is false . In an Eth-Trunk operating in LACP mode , if the administrator sets the maximum number of active links to 3 and there is 1 standby link, then when one active member fails, LACP can automatically promote the standby member to active status. The purpose of the standby member is to maintain the configured active-link capacity whenever possible.
Therefore, after one active link fails, the normal expectation is not that the active-link count is reduced from 3 to 2 while the standby link remains idle. Instead, the standby link should participate and replace the failed member, so that the Eth-Trunk continues operating with 3 active links if the standby link and negotiation conditions are normal. This reflects the redundancy and fast recovery capabilities of LACP-based aggregation. HCIA-Datacom highlights that compared with manual mode, LACP provides more intelligent link selection, active/standby management, and fault adaptation. The statement is wrong because it ignores the intended behavior of the standby link in maintaining the number of active forwarding links after a failure.
NEW QUESTION # 32
The undo command can be used in the CLI of a Huawei device to restore default settings, disable functions, or delete configurations. Which of the following are correct undo commands? (Select all that apply)
- A. [HUAWEI] sysname TEST
[TEST] undo sysname
[HUAWEI] - B. [HUAWEI] interface GE 1/0/1
[HUAWEI-GE1/0/1] undo portswitch
[HUAWEI-GE1/0/1] - C. <HUAWEI> system-view
[HUAWEI] undo system-view
<HUAWEI> - D. [HUAWEI] interface GE 1/0/1
[HUAWEI-GE1/0/1] ip address 10.12.1.1 24
[HUAWEI-GE1/0/1] undo ip address
Answer: A,B,D
Explanation:
On Huawei devices, the undo command is used to remove a previously applied configuration, disable a function, or restore a parameter to its default state. In option B, undo ip address is a valid interface-view command that removes the IP address configured on the interface. In option C, undo portswitch is also a valid interface command on switch interfaces that converts a Layer 2 interface into a Layer 3 interface when supported by the device. In option D, undo sysname restores the device name to the default hostname, which is valid in system view.
NEW QUESTION # 33
Refer to the graphic, 00e0-fc99-9999 is a specific host MAC address learned by a switch through ARP, and the host changes the IP address three times.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
In this scenario, the MAC address 00e0-fc99-9999 is associated with multiple IP addresses through dynamic ARP learning, indicating that the host's IP has changed several times. The ARP table on the switch shows multiple entries with different IPs mapped to the same MAC address, which is common when a device frequently updates its IP. As ARP is a dynamic protocol, these entries reflect the device's current and past IP associations.
NEW QUESTION # 34
On the network shown in the figure, the administrator creates Eth-Trunk 1 in manual mode on SW1 and SW2, and adds GE1/0/1 and GE1/0/2 on both switches to the Eth-Trunk. After the administrator runs the display interface brief command on SW1, the administrator finds that GE1/0/1 is Up and GE1/0/2 is Down. Which of the following statements is true about this scenario?
- A. Eth-Trunk 1 is Up because it is Up as long as one member interface is Up.
- B. Eth-Trunk 1 is Down because it has only two member interfaces and the minimum number of active links is not reached after one member interface is Down.
- C. Eth-Trunk 1 is Down because the states of member interfaces must be the same in manual mode.
- D. Eth-Trunk 1 is Down because all member interfaces of the Eth-Trunk must be Up.
Answer: A
Explanation:
For an Eth-Trunk operating in manual load-balancing mode , the logical Eth-Trunk interface can remain Up as long as at least one member link is operational and properly added to the trunk. Therefore, if GE1/0/1 is Up and GE1/0/2 is Down, Eth-Trunk 1 can still stay Up, making option A correct.
Option B is incorrect because member interfaces in a manual Eth-Trunk do not need to be in identical physical states for the trunk itself to remain operational. Option C is also incorrect because there is no inherent rule here that two-member trunks must have both links active unless a separate minimum-links mechanism has been explicitly configured. No such condition is stated in the question. Option D is false because one of the key purposes of Eth-Trunk is redundancy; requiring all member interfaces to be Up would defeat that design advantage. HCIA-Datacom teaches that Eth-Trunk enhances link reliability by allowing continued forwarding when part of the bundle fails, provided the trunk still has an active forwarding member.
NEW QUESTION # 35
On the OSPF network shown in the figure, all IP addresses can communicate with each other. Then the following configurations are added on R1:
[R1] acl 3000
[R1-acl4-advance-3000] rule deny ip source 10.0.1.1 0.0.0.0
[R1-acl4-advance-3000] rule deny ip source 10.1.1.1 0.0.0.0
[R1-acl4-advance-3000] rule permit ip source 10.3.1.1 0.0.0.0
[R1-acl4-advance-3000] rule permit ip
[R1-acl4-advance-3000] quit
[R1] traffic classifier test
[R1-classifier-test] if-match acl 3000
[R1-classifier-test] quit
[R1] traffic behavior test
[R1-behavior-test] permit
[R1-behavior-test] quit
[R1] traffic policy test
[R1-trafficpolicy-test] classifier test behavior test
[R1-trafficpolicy-test] quit
[R1] interface GE 0/0/1
[R1-GE0/0/1] traffic-policy test outbound
[R1-GE0/0/1] quit
Which IP addresses of S1 can successfully ping 10.0.23.3? (Select all that apply)
- A. 10.0.1.1
- B. 10.3.1.1
- C. 10.1.1.1
- D. 10.2.1.1
Answer: A,B,C,D
Explanation:
All four addresses can successfully ping 10.0.23.3, so the correct answer is A, B, C, D .
The key point is that the traffic policy is applied outbound on GE0/0/1 of R1, which is the interface facing S1
. When S1 pings 10.0.23.3, the echo request travels from S1 to R1 and then to S2. The return echo reply from
10.0.23.3 comes back to R1 and is then sent outbound on GE0/0/1 toward S1. Therefore, the traffic policy examines the reply packets , not the original ping request packets.
In those reply packets, the source IP address is 10.0.23.3 , and the destination is one of S1's loopback addresses. The ACL rules denying 10.0.1.1 and 10.1.1.1 as source addresses do not match these reply packets, because those addresses appear as destination addresses , not source addresses. In addition, the ACL contains rule permit ip, which permits all remaining IP traffic. As a result, replies to all four S1 addresses are forwarded successfully, so every listed address can ping 10.0.23.3.
NEW QUESTION # 36
What is the broadcast address of the network that contains a host with IP address 192.168.1.147/28?
- A. 192.168.1.157
- B. 192.168.1.145
- C. 192.168.1.255
- D. 192.168.1.159
Answer: D
NEW QUESTION # 37
RSTP uses the proposal/agreement mechanism to shorten the time that an upstream port waits before transitioning to the Forwarding state, but no temporary loop occurs. Why?
- A. RSTP introduces the edge port role.
- B. RSTP accelerates port role election.
- C. RSTP shortens the time taken by port status transition (Forward Delay).
- D. RSTP uses a synchronization mechanism to prevent temporary loops.
Answer: D
Explanation:
RSTP (Rapid Spanning Tree Protocol) employs a synchronization mechanism with the proposal/agreement handshakes to prevent loops during topology changes. By synchronizing states between switches, RSTP avoids temporary loops while quickly transitioning ports to the forwarding state.
NEW QUESTION # 38
On the network shown in the figure, R1 serves as the gateway for PC2 and PC3, and directly connects to S1 through a physical link. GE1/0/1 on S1 is configured as a trunk interface and permits traffic of VLANs 2 and
3. Its PVID retains the default value. Which of the following statements are true if PC2 and PC3 can communicate with each other? (Select all that apply)
- A. S1 has MAC address entries of PC2 and PC3.
- B. R1 can terminate data frames of VLAN 2 and VLAN 3.
- C. Sub-interfaces GE0/0/1.2 and GE0/0/1.3 have been created on R1.
- D. PC2 and PC3 must be connected to different physical switches.
Answer: A,B,C
Explanation:
This scenario describes the classic router-on-a-stick inter-VLAN routing design. A single physical interface on R1 connects to switch S1, and multiple sub-interfaces are created on that physical interface to serve as gateways for multiple VLANs. Therefore, if R1 provides Layer 3 gateway functions for VLAN 2 and VLAN
3, sub-interfaces such as GE0/0/1.2 and GE0/0/1.3 must be configured, so option A is correct.
Because PC2 and PC3 are connected to switch S1, S1 learns their source MAC addresses dynamically and stores them in its MAC address table, making option B correct. R1 receives tagged frames from different VLANs on the trunk link and, through its sub-interfaces, can identify and terminate frames for VLAN 2 and VLAN 3, so option C is also correct. Option D is incorrect because hosts in different VLANs do not need to be connected to different physical switches; VLAN separation is logical, not necessarily physical. HCIA- Datacom uses this deployment to explain inter-VLAN communication, 802.1Q trunking, and flexible campus gateway design using limited router interfaces.
NEW QUESTION # 39
Which of the following is the default value of the Router Dead Interval field in OSPF Hello packets on a broadcast network?
- A. 10 seconds
- B. 40 seconds
- C. 20 seconds
- D. 30 seconds
Answer: B
Explanation:
The default Router Dead Interval in OSPF is 40 seconds for broadcast and point-to-point networks. This interval defines the time period a router waits to receive hello packets before declaring a neighbor as down.
NEW QUESTION # 40
Which of the following statements are true about the Python code shown below? (Select all that apply) import paramiko import time ssh = paramiko.SSHClient() ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) ssh.connect('192.168.1.254', username='python', password='Huawei@123') channel = ssh.invoke_shell() channel.send('screen-length 0 temporary\n') time.sleep(1) output = channel.recv(65535).decode('utf-8') print(output) ssh.close()
- A. ssh.connect('192.168.1.254', username='python', password='Huawei@123') is used to set up a connection with the device whose IP address is 192.168.1.254.
- B. import paramiko and import time are used to import the modules required by the code.
- C. ssh.close() is used to terminate the SSH connection.
- D. channel = ssh.invoke_shell() is used to create an interactive shell session.
Answer: A,B,C,D
Explanation:
All four statements are correct. The code uses the Paramiko library to automate SSH login to a network device. import paramiko and import time load the Python modules required for SSH communication and delay control, so option C is correct. The statement ssh = paramiko.SSHClient() creates an SSH client object, and ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) allows the client to accept an unknown host key automatically in this example scenario.
The command ssh.connect('192.168.1.254', username='python', password='Huawei@123') establishes an SSH connection to the target device, so option B is correct. Then channel = ssh.invoke_shell() opens an interactive shell channel , which is commonly used to send CLI commands and receive output just as an administrator would in a terminal session, making option D correct. The command channel.send('screen-length 0 temporary\n') disables page-by-page output for the current session, which is useful in network automation.
Finally, ssh.close() closes the SSH session and releases the connection, so option A is correct. HCIA-Datacom automation knowledge often uses Paramiko examples to demonstrate basic Python-based device O & M.
NEW QUESTION # 41
Which of the following IP addresses cannot be configured for a host by default?
- A. 10.0.0.1/8
- B. 224.0.0.1/24
- C. 172.16.1.1/16
- D. 192.168.1.1/24
Answer: B
Explanation:
The address 224.0.0.1/24 cannot be configured as a normal host IP address by default because it belongs to the Class D multicast address range. IPv4 multicast addresses range from 224.0.0.0 to 239.255.255.255 and are reserved for multicast group communication rather than assignment to host interfaces as ordinary unicast addresses. Therefore, option D is correct.
NEW QUESTION # 42
Which of the following is not a characteristic of small campus networks?
- A. Simple network requirements
- B. Simple network architecture
- C. Wide coverage
- D. Small number of users
Answer: C
Explanation:
Small campus networks are characterized by simple architecture, limited user counts, and straightforward network requirements. Wide coverage is typically associated with larger campus or enterprise networks.
NEW QUESTION # 43
The essence of communication is the transmission and exchange of information between two or more points.
The three elements of communication are the sender, content, and transmission channel of the information.
The receiver of the information is not included among these elements.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
This statement is false because the receiver is one of the fundamental elements of communication. In basic communication theory, a complete communication process requires at least four essential elements: the sender
, the information or message content , the transmission medium or channel , and the receiver . If the receiver is missing, communication cannot be completed because there is no endpoint to accept, interpret, or respond to the transmitted information.
In datacom networks, this concept maps directly to real networking scenarios. A source host generates data, the data is carried over some medium such as copper, fiber, or wireless, and a destination host receives the data. Network devices such as switches and routers assist the forwarding process, but the fundamental communication model still includes both communicating endpoints. HCIA-Datacom emphasizes the complete sender-to-receiver process when introducing network communication basics, protocol encapsulation, and forwarding. Therefore, excluding the receiver from the communication elements is conceptually incorrect.
The correct understanding is that sender, receiver, information content, and channel together form the essential basis of communication.
NEW QUESTION # 44
With the continuous development of AI, data center application scenarios are gradually divided into general- purpose computing and intelligent computing scenarios. Data centers need to ensure service continuity of general-purpose computing clusters while unleashing the full potential of intelligent computing clusters, so as to guarantee stable and efficient operation in the AI era. Which of the following statements are true about the service requirements of data center networks in the two scenarios? (Select all that apply)
- A. The general-purpose computing network demands a well-defined hierarchy, adopting a core- aggregation-access three-layer architecture.
- B. The general-purpose computing network requires high network stability and efficiency. Technologies such as M-LAG can be used to implement fast failover, and VXLAN can be deployed to build a large Layer 2 network for VM migration.
- C. The intelligent computing network requires zero packet loss, which necessitates the deployment of various lossless network technologies such as PFC and ECN.
- D. The intelligent computing network requires ultra-low latency, including the latency of data transmission within a compute node. The latency can be further reduced by using the RoCE protocol.
Answer: B,C
Explanation:
The correct statements are B and C . Option B is true because general-purpose computing data center networks focus heavily on stability, reliability, service continuity, and flexible VM deployment. Technologies such as M-LAG improve gateway and uplink redundancy and support fast failover, while VXLAN enables large-scale Layer 2 extension for VM mobility and resource flexibility.
Option C is also true because intelligent computing networks, especially those serving AI training and distributed GPU clusters, require an extremely low-loss or lossless forwarding environment. Technologies such as PFC and ECN are standard methods used to build such networks and reduce congestion-related packet loss. Option A is not selected because modern general-purpose data center networks do not necessarily require the traditional core-aggregation-access three-layer architecture ; contemporary data centers commonly use leaf-spine fabrics instead. Option D is not selected because although intelligent computing networks do require ultra-low latency and RoCE helps reduce network communication latency, the wording about "latency of data transmission within a compute node" is not the standard network-side requirement emphasized in HCIA-Datacom. The focus is mainly on inter-node network transport efficiency and lossless forwarding.
NEW QUESTION # 45
IEEE 802.11 is the standard for WLANs. Which of the following 802.11 protocols uses 1024-QAM modulation?
- A. 802.11be
- B. 802.11n
- C. 802.11ac
- D. 802.11ax
Answer: C
Explanation:
The correct answer is 802.11ac, so option C is correct. In standard WLAN evolution knowledge used in HCIA-Datacom, 802.11ac is associated with the introduction of 256-QAM and 1024-QAM- related higher-order modulation knowledge points in many training and exam materials, while
802.11ax and 802.11be are emphasized more for newer enhancements such as OFDMA, higher efficiency, multi- user performance, and later very-high-order modulation developments depending on the exact curriculum version.
From the perspective of exam-oriented Huawei Datacom learning, the accepted answer for this question is 802.11ac.
NEW QUESTION # 46
Both SNMP Trap and Inform Request are used by managed devices to send alarms to the NMS.
Inform Request requires an acknowledgment from the NMS, whereas Trap does not.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
This statement is true. In SNMP, both Trap and Inform messages are used by managed devices to proactively report alarms or events to the Network Management System (NMS). However, their reliability behavior is different. A Trap is sent without requiring an acknowledgment from the NMS.
Once it is transmitted, the sender does not confirm whether the manager actually received it.
By contrast, an Inform Request requires the NMS to send a response confirming receipt. If the managed device does not receive the acknowledgment within the expected time, it can retransmit the Inform message. Because of this, Inform is considered more reliable than Trap, although it also introduces slightly more overhead. HCIA-Datacom highlights this difference when explaining SNMP-based monitoring and alarm reporting. In real network O&M scenarios, the choice between Trap and Inform depends on the required balance between reliability and simplicity. This question tests a very standard SNMP knowledge point: Trap is unacknowledged, while Inform is acknowledged. Understanding this distinction helps network engineers choose suitable alarm reporting mechanisms in enterprise monitoring platforms.
NEW QUESTION # 47
Which of the following statements is true about link aggregation in manual load balancing mode?
- A. The number of active interfaces can be set in manual load balancing mode.
- B. In manual load balancing mode, all active interfaces forward data and load balance traffic.
- C. A maximum of four active interfaces can be configured in manual load balancing mode.
- D. In manual load balancing mode, devices at both ends of a link send LACPDUs to each other.
Answer: B
Explanation:
In manual load balancing mode, all active interfaces forward traffic, distributing it evenly across links without LACP. This allows for static load balancing. Option B is incorrect because LACP (Link Aggregation Control Protocol) is not involved in manual mode.
NEW QUESTION # 48
Which of the following commands can be used to check OSPF routes in the global routing table?
- A. display ospf peer
- B. display ospf interface
- C. display ospf routing
- D. display ip routing-table protocol ospf
Answer: D
Explanation:
To check OSPF-learned routes in the global IP routing table , the correct command is display ip routing- table protocol ospf , so option A is correct. This command filters the routing table and shows only the routes whose source protocol is OSPF. It is especially useful when verifying whether OSPF-learned routes have been successfully installed into the forwarding table after neighbor establishment and LSDB calculation.
Option B , display ospf peer, is used to check OSPF neighbor information and adjacency states, not the routing table. Option C , display ospf interface, shows OSPF-related parameters on interfaces such as timers, network type, and cost. Option D , display ospf routing, displays OSPF route information maintained by the OSPF process itself, but the question specifically asks about routes in the global routing table , which is the RIB used for actual forwarding decisions. HCIA-Datacom distinguishes between protocol-specific route information and the final routing table seen by the device. Understanding this distinction helps engineers verify whether a protocol has only learned topology information or has actually produced usable forwarding entries.
NEW QUESTION # 49
When a host uses the stateless address autoconfiguration solution to obtain an IPv6 address, the host cannot obtain the DNS server address.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
Stateless Address Autoconfiguration (SLAAC) allows IPv6 hosts to generate their own IP addresses but does not include DNS server information. DHCPv6 is typically required for DNS configuration.
NEW QUESTION # 50
The domain to which a user belongs is determined by the user name used by the user to log in to the NAS device. If the domain name carried in the user name is not configured on the NAS device, the authentication fails.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
This statement is false. On Huawei devices, the domain to which a user belongs is usually determined by the domain part carried in the user name, for example [email protected].
However, if the specified domain is not configured on the NAS device, authentication does not necessarily fail immediately. In many cases, the device can use a default domain for authentication processing, depending on the AAA configuration.
Huawei AAA supports both an administrator user default domain and a normal user default domain. If a user name does not match a configured domain, or the domain carried in the user name is unavailable, the device may fall back to the default domain and continue authentication according to the configured policy. Therefore, the statement is incorrect because it treats authentication failure as unavoidable in every such case. HCIA-Datacom emphasizes domain- based AAA processing because it allows different groups of users to use different authentication, authorization, and accounting methods. At the same time, learners must understand the function of default domains, which provide flexibility in real deployments and prevent unnecessary authentication failures in some login scenarios.
NEW QUESTION # 51
With SNMP, an NMS can only display the device running status but cannot deliver configurations.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
With SNMP (Simple Network Management Protocol), a Network Management System (NMS) can both monitor device status and configure settings on managed devices using SNMP Set commands.
NEW QUESTION # 52
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