[Sep-2026] Latest Huawei H12-811_V2.0 exam dumps and online Test Engine
Huawei H12-811_V2.0: Selling HCIA-Datacom Products and Solutions
NEW QUESTION # 27
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 Down because the states of member interfaces must be the same in manual mode.
- B. Eth-Trunk 1 is Down because all member interfaces of the Eth-Trunk must be Up.
- C. 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.
- D. Eth-Trunk 1 is Up because it is Up as long as one member interface is Up.
Answer: D
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 # 28
Which of the following phases are required for establishing a connection between an SSH server and an SSH client? (Select all that apply)
- A. Algorithm negotiation
- B. User authentication
- C. Key exchange
- D. Version negotiation
Answer: A,B,C,D
Explanation:
The establishment of an SSH connection includes multiple mandatory phases that ensure both secure communication and authenticated access. First, the SSH client and server perform version negotiation to determine a mutually supported SSH protocol version. Then they carry out algorithm negotiation, during which they agree on the encryption algorithm, key exchange algorithm, integrity algorithm, and other security parameters to be used for the session.
After that, the peers perform key exchange, which is used to derive shared session keys securely over an insecure network. This stage is essential because it enables subsequent communication to be encrypted and protected against interception. Finally, once the secure channel has been established, user authentication is performed so that the server can verify the identity of the client user. This can be done using a password, public key, or other supported authentication method.
Therefore, all four options are required phases in the SSH connection establishment process.
HCIA-Datacom emphasizes these steps because SSH is a core secure management protocol used to replace insecure protocols such as Telnet and FTP in modern network operation and maintenance.
NEW QUESTION # 29
Which of the following are features of the OSPF protocol?
- A. Routing loops are likely to occur.
- B. The shortest path is calculated based on the number of hops.
- C. Triggered update is supported.
- D. Area division is supported.
Answer: C,D
Explanation:
Option B: OSPF supports triggered updates, allowing routing tables to be updated only when changes occur, conserving bandwidth.
Option D: OSPF supports area division, which is essential for optimizing large networks and limiting the scope of link-state advertisements.
NEW QUESTION # 30
If a device running STP receives an RSTP configuration BPDU, it discards the BPDU.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
A device running Standard Spanning Tree Protocol (STP) is not compatible with Rapid Spanning Tree Protocol (RSTP) BPDUs and will discard them upon receipt. STP devices cannot interpret the additional RSTP fields, leading to discarded BPDUs.
NEW QUESTION # 31
Which of the following configurations can enable connectivity between interfaces on R1 and R3? (Select all that apply)
- A. [R1] ip route-static 20.1.1.0 24 10.0.0.2
- B. [R1] ip route-static 20.1.1.0 24 20.1.1.2
- C. [R3] ip route-static 10.0.0.0 24 20.1.1.2
- D. [R3] ip route-static 10.0.0.0 24 20.1.1.1
Answer: A,D
Explanation:
For two directly connected edge networks to communicate through intermediate routing, each end router must have a route to the remote destination network pointing to the correct next hop on the transit link. Since
10.0.0.0/24 is directly connected to R1 and 20.1.1.0/24 is directly connected to R3, R1 needs a route to
20.1.1.0/24, and R3 needs a route to 10.0.0.0/24.
Option A is correct because it configures on R1 a static route to the remote network 20.1.1.0/24 using next hop 10.0.0.2, which is the neighbor toward the transit path. Option D is correct because it configures on R3 a static route to the remote network 10.0.0.0/24 using next hop 20.1.1.1, which is the proper adjacent forwarding address in that direction. Option B is incorrect because a router cannot use a next hop that belongs to the remote destination network but is not directly reachable as a valid immediate forwarding address in this topology. Option C is also incorrect because the specified next hop is not the correct adjacent next-hop address for R3. HCIA-Datacom stresses that static routes must always point to a reachable next hop or outbound interface.
NEW QUESTION # 32
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. Sub-interfaces GE0/0/1.2 and GE0/0/1.3 have been created on R1.
- B. R1 can terminate data frames of VLAN 2 and VLAN 3.
- C. PC2 and PC3 must be connected to different physical switches.
- D. S1 has MAC address entries of PC2 and PC3.
Answer: A,B,D
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 # 33
If a network device has both a static route and a direct route to network 10.1.1.0/24, it uses the direct route preferentially.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
This statement is true . When a device has multiple routes to the same destination prefix, route selection is based first on the longest prefix match , and when prefix length is the same, the device compares the route preference or administrative priority associated with each routing source. On Huawei devices, a direct route has a better preference than a static route , so the direct route is selected first when both routes have the same destination and mask.
A direct route is generated automatically when an IP address is configured on an interface and that interface is Up. Because the destination network is directly connected, this route is considered more trustworthy and efficient than a manually configured static route pointing to the same prefix. HCIA-Datacom uses this principle to explain route selection, routing-table generation, and troubleshooting cases where a configured static route does not appear as the active route because a direct or dynamic route has higher priority. This is a basic but important concept in IP forwarding and helps engineers correctly interpret routing tables on Huawei routers and Layer 3 switches.
NEW QUESTION # 34
In the WAC + Fit AP networking, an AP fails to go online. The output of the display ap all command run on the WAC is shown below. According to the command output, which of the following is the possible cause of the AP's failure to go online?
- A. The AP is in the blacklist.
- B. The AP fails to initialize the configuration.
- C. The AP's software version does not match the WAC's software version.
- D. The AP fails the authentication.
Answer: C
Explanation:
The correct answer is C. In the command output, the AP state is shown as ver-mismatch. This state directly indicates a version mismatch between the AP and the WAC. In Huawei WLAN deployment, a Fit AP must use a software version that is compatible with the WAC version. If the versions do not match, the AP may be discovered by the WAC and appear in the AP list, but it cannot successfully complete the online process.
Option A is incorrect because blacklist-related failures are displayed with blacklist-related status information, not ver-mismatch. Option B is also incorrect because authentication failures normally generate authentication- related fault indications. Option D is incorrect because configuration initialization failure would not be identified by the specific ver-mismatch state.
HCIA-Datacom troubleshooting knowledge emphasizes reading AP online states carefully. Common causes of AP online failure include IP address acquisition failure, CAPWAP tunnel establishment failure, insufficient licenses, authentication problems, and version mismatch. When the state explicitly shows ver-mismatch, the troubleshooting direction is clear: check AP and WAC software compatibility and upgrade or align the software version as needed.
NEW QUESTION # 35
R1 has the following configurations:
[R1] nat address-group test 1
[R1-address-group-test] section 1 100.1.23.1 100.1.23.254
[R1-address-group-test] mode pat
[R1-address-group-test] quit
[R1] nat-policy
[R1-policy-nat] rule name test
[R1-policy-nat-rule-test] source-address range 192.168.0.0 192.168.255.255
[R1-policy-nat-rule-test] action source-nat address-group test
[R1-policy-nat-rule-test] quit
[R1-policy-nat] quit
[R1] interface GE 0/0/2
[R1-GE0/0/2] nat enable
[R1-GE0/0/2] quit
Which of the following statements is false ?
- A. An intranet user's post-NAT IP address may be 100.1.23.254.
- B. The intranet user with the IP address 192.168.1.100 can access the public network.
- C. The post-NAT IP addresses of intranet users with different IP addresses must be different.
- D. If data packets from intranet users are not sent through GE0/0/2 of R1, the users may fail to access the public network.
Answer: C
Explanation:
Option C is false. In this configuration, the NAT address group test contains the public address range
100.1.23.1 to 100.1.23.254 , and the address group works in PAT mode . Port Address Translation allows multiple different intranet users to share the same public IP address while being distinguished by different transport-layer port numbers. Therefore, intranet users with different private IP addresses do not have to use different post-NAT public IP addresses.
Option A is true because 100.1.23.254 is included in the configured public address pool and can be used for source NAT. Option B is also true because NAT is enabled on GE0/0/2 , so if user traffic does not leave through that interface, the NAT policy may not be applied and public access may fail. Option D is true because the configured source address range includes 192.168.1.100, which falls within 192.168.0.0 to
192.168.255.255. HCIA-Datacom teaches that NAT behavior depends on matching traffic, address pools, PAT or no-PAT mode, and the interface where NAT is enabled. This question mainly tests understanding of source NAT and PAT address-sharing behavior.
NEW QUESTION # 36
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 # 37
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. Sub-interfaces GE0/0/1.2 and GE0/0/1.3 have been created on R1.
- B. R1 can terminate data frames of VLAN 2 and VLAN 3.
- C. PC2 and PC3 must be connected to different physical switches.
- D. S1 has MAC address entries of PC2 and PC3.
Answer: A,B,D
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.
NEW QUESTION # 38
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. The RDMA protocol stack is used on the intelligent computing network to reduce the transmission latency between GPU servers and physical switches.
- B. 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.
- C. 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.
- D. Lossless technologies such as PFC and ECN are used on the intelligent computing network to implement a network with zero packet loss.
Answer: A,B
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 # 39
On a Layer 2 WLAN, STAs use an AC as their gateway.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
In a Layer 2 WLAN, an Access Controller (AC) typically handles authentication and management but does not act as a gateway. Instead, a Layer 3 device, such as a router, serves as the gateway.
NEW QUESTION # 40
Assume that you cannot configure an IP address for GE1/0/1 on a Huawei switch. Which of the following commands can you run in the interface view to resolve this problem?
- A. port link-type trunk
- B. port link-type access
- C. undo portswitch
- D. port link-type hybrid
Answer: C
Explanation:
On Huawei switches, a physical Ethernet interface usually works as a Layer 2 switch port by default. A Layer 2 interface cannot be assigned an IP address directly. If an administrator wants to configure an IP address on such an interface, the interface must first be converted into a Layer 3 interface . The command used for this is undo portswitch , so option B is correct.
After this command is executed, the interface no longer behaves as a Layer 2 switching port and can then support Layer 3 features such as direct IP address configuration. Options A , C , and D are all Layer 2 port- type commands used to configure the interface as a trunk, access, or hybrid port. These commands do not solve the problem because they keep the interface operating at Layer 2. HCIA-Datacom emphasizes the difference between Layer 2 switching interfaces and Layer 3 routed interfaces on switches. Understanding when to use undo portswitch is important in campus network deployment, especially when configuring routed uplinks, management interfaces, or inter-device Layer 3 links on switches.
NEW QUESTION # 41
When a Huawei network device functions as an FTP server, which of the following are possible causes of an FTP client failing to log in to the FTP server? (Select all that apply)
- A. The FTP user name and password are not configured.
- B. The authorized directory is not specified for FTP users.
- C. The network between the device and the FTP client is unreachable.
- D. The FTP server function is not enabled on the device.
Answer: A,B,C,D
Explanation:
All four options are possible causes of FTP login failure, so the correct answer is A, B, C, and D.
Option A is correct because if the FTP server function is not enabled on the Huawei device, the device cannot provide FTP services and the client cannot log in. Option B is also correct because if the authorized directory is not specified for the FTP user, the user may not be able to complete login or access file services properly, depending on the FTP user configuration requirements.
Option C is correct because an FTP user account must be configured with the required username and password; otherwise, authentication cannot succeed. Option D is also correct because if the network between the FTP client and the device is unreachable, the client cannot establish the FTP connection at all.
In HCIA-Datacom troubleshooting, FTP login failure is usually checked from four aspects: service enablement, user configuration, permission or directory authorization, and network connectivity.
This question tests standard remote maintenance troubleshooting logic for file transfer services on Huawei network devices.
NEW QUESTION # 42
Which of the following statements regarding static routing and dynamic routing is incorrect?
- A. Dynamic routing will use more resources than static routes.
- B. The static routing can automatically recover when a link failure is encountered.
- C. The use of dynamic routing is more convenient for the administrator to manage the network following network convergence.
- D. The static routing can be easily configured and managed on the enterprise network.
Answer: B
Explanation:
Static routing does not automatically recover from link failures; manual reconfiguration is required if a static route path becomes invalid. Dynamic routing protocols, on the other hand, adapt automatically to network changes, adjusting routes as needed.
NEW QUESTION # 43
With the release of Wi-Fi 7, wireless networks are now faster, more stable, and more latency- tolerant than ever. Which of the following frequency bands are supported by Wi-Fi 7? (Select all that apply)
- A. 2.4 GHz
- B. 5 GHz
- C. 9.6 GHz
- D. 6 GHz
Answer: A,B,D
Explanation:
Wi-Fi 7 supports operation in the 2.4 GHz, 5 GHz, and 6 GHz frequency bands, so options A, C, and D are correct. These three bands together provide flexible coverage and capacity options.
The 2.4 GHz band offers better propagation and wider coverage, while the 5 GHz and 6 GHz bands provide more channels, higher capacity, and better support for high-speed, low-latency services.
NEW QUESTION # 44
Which of the following port states are included in Rapid Spanning Tree Protocol (RSTP)?
- A. Learning
- B. Discarding
- C. Listening
- D. Forwarding
Answer: A,B,D
Explanation:
RSTP (Rapid Spanning Tree Protocol) combines the Blocking, Listening, and Disabled states into Discarding, reducing the number of states to Discarding, Learning, and Forwarding. RSTP does not use a separate Listening state, as in standard STP.
NEW QUESTION # 45
On the network shown in the figure, all switches run STP. All links have a path cost of 20, and SW1 is the root bridge. What is the root path cost (RPC) of SW4?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
The root path cost (RPC) of a switch is the total path cost from that switch to the root bridge along the selected spanning-tree path. Since SW1 is given as the root bridge, its RPC is 0. Each link in the topology has a path cost of 20 . To determine SW4's RPC, you identify the shortest active STP path from SW4 to SW1.
Based on the topology used in the question, SW4 reaches SW1 through a path containing two links .
Therefore, the total root path cost is 20 + 20 = 40 , which makes option B correct. This is a standard STP calculation. HCIA-Datacom uses RPC as one of the main comparison parameters in root-port election on non- root switches. A lower RPC means a better path toward the root bridge. If multiple candidate ports have the same RPC, the switch then compares the sender's bridge ID and port ID. This question checks whether the learner understands that RPC is cumulative across the spanning-tree forwarding path and is not simply the cost of a single directly connected link unless the switch is directly attached to the root bridge.
NEW QUESTION # 46
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