[Mar-2026] Huawei H12-821_V1.0 Official Cert Guide PDF
Exam H12-821_V1.0: HCIP-Datacom-Core Technology V1.0 - TestInsides
Huawei H12-821_V1.0 exam is intended for individuals with a solid foundation in data communications and a strong understanding of network protocols and technologies. It is an intermediate-level certification that requires candidates to have prior experience in the field of data communications. H12-821_V1.0 exam is intended to validate the knowledge and skills of professionals who are responsible for the design, implementation, and maintenance of data communication networks.
NEW QUESTION # 286
Which of the following types of equipment is suitable for Huawei IP wide-area bearer network solution?
- A. NetEngine 8000
- B. AirEngine 5760-22w
- C. NetEngine AR6000
- D. CE12804
Answer: A
NEW QUESTION # 287
Which of the following does the basic framework of the SSH protocol not include?
- A. SSH user authentication protocol
- B. SSH transport layer protocol
- C. SSH connection protocol
- D. SSH User Audit Protocol
Answer: D
NEW QUESTION # 288
As shown in the figure, when R2 passes the route of 10.0.1.0/24 to R3, which of the following is the Next_Hop address of the route?
- A. 10.0.23.3
- B. 10.0.12.2
- C. 10.0.23.2
- D. 10.0.12.1
Answer: D
NEW QUESTION # 289
Huawei modular devices have multiple hardware modules that provide different functions. Match the following hardware modules with their functions.
Answer:
Explanation:
Explanation:
The hardware modules of Huawei modular devices and their functions are:
* Main Processing Unit (MPU): Provides control and management planes for the entire system, responsible for protocol processing, system security, and software upgrades.
* Switch Fabric Unit (SFU): Provides the data plane, enabling high-speed data switching between service modules.
* Line Processing Unit (LPU): Manages data forwarding, offering various interfaces (optical and electrical) for data access.
NEW QUESTION # 290
During routine maintenance, an enterprise administrator runs a command to check VRRP group information.
Which of the following statements is false about the command output?
yaml
CopyEdit
<HUAWEI> display vrrp verbose
Vlanif100 | Virtual Router 1 State: Master
Virtual IP: 10.1.1.100
Master IP: 10.1.1.2
PriorityRun: 120 PriorityConfig: 120
DR: None BDR: None MTU: 0
Preempt: YES Delay Time: 20s
Remain: --
Track: YES Priority Reduced: 20
Auth Type: MD5
BFD-session State: UP
- A. Authentication is enabled for the VRRP group.
- B. The ID of the VRRP group is 1.
- C. Preemption is enabled for the VRRP group.
- D. This VRRP group is an mVRRP group.
Answer: D
Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
Analysis of VRRP Configuration:
Option A (Preemption):Correct. The output explicitly states that preemption is enabled.
Option C (Authentication):Correct. Authentication is enabled using MD5.
Option D (Group ID):Correct. The VRRP group ID is explicitly stated as 1.
False Statement:
Option B (mVRRP Group):The output does not indicate this is anmVRRP (Multicast VRRP)group. This feature must be explicitly configured and is not enabled by default.
References:
HCIA-Datacom Study Guide, Chapter: VRRP Configuration Details
Huawei VRRP Command Reference
NEW QUESTION # 291
Similar to the OSPF DR, the IS-IS DIS needs to be elected on a broadcast network. However, the OSPF DR is preemptive by default, whereas the IS-IS DIS is not preemptive by default.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
The IS-IS Designated Intermediate System (DIS) is responsible for generating and updating pseudonode LSPs on a broadcast network.
Unlike OSPF DR, the IS-IS DIS does not preempt by default. This behavior avoids unnecessary flapping in the network due to frequent DIS re-elections.
NEW QUESTION # 292
All routers in a network run IS-IS and are all in Area 49.0001. The LSDB of R1 is as shown in the figure. Based on this, the Level of the four routers can be determined.
Answer:
Explanation:
NEW QUESTION # 293
OSPF supports area authentication and interface authentication. If both authentication modes are configured, Interface authentication takes preference over area authentication.
- A. TRUE
- B. FALSE
Answer: A
NEW QUESTION # 294
As shown in the figure, the output information of R1 is as follows, then the Router ID of R1's neighbor router is ().
Answer:
Explanation:
10.0.2.2
NEW QUESTION # 295
L2TP is a type of VPDN (Virtual Private Dial-up network) tunnel protocol. It is a VPN that provides access services for traveling employees or corporate branches to remotely access corporate intranet resources in remote office scenarios. It runs on the network layer of the TCP/IP protocol stack.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 296
Four routers run IS-IS and have established adjacencies. The area IDs and router levels are marked in the following figure. R1 and R2 are connected through a PPP link, and R3 is the DIS. Which of the following statements are true?
- A. R2 sends an LSP to R3 and R4 in unicast mode.
- B. If R1 sends an LSP, R2 needs to send a PSNP for acknowledgment.
- C. R3 periodically sends CSNPs to implement Level-2 LSDB synchronization.
- D. If R2 sends a Level-2 LSP, R3 needs to send a PSNP for acknowledgment.
Answer: B,C
Explanation:
R3, as the DIS in the Level-2 domain, periodically sends Complete Sequence Number Protocol Data Units (CSNPs) to ensure LSDB synchronization among Level-2 routers.
R1 and R2 are in a Level-1 domain, and IS-IS requires the receiving router (R2) to acknowledge an LSP from R1 by sending a Partial Sequence Number Protocol Data Unit (PSNP).
IS-IS LSPs in a broadcast network are sent using multicast, not unicast, making option C incorrect.
For Level-2 LSPs, acknowledgments are not provided using PSNP by R3; CSNPs are sufficient for synchronization .
NEW QUESTION # 297
The RSTP protocol provides a variety of protection functions. For example, when the edge terminal port is configured in the protection state, the processing method of the edge port after receiving the BPDU message is:
- A. Close the port
- B. Directly discard the BPDU message
- C. Obtain relevant information after the BPDU message
- D. Forward BPDU messages as required
Answer: A
NEW QUESTION # 298
In which of the following states does BGP wait for Open messages from peers?
- A. Connect
- B. Open Confirm
- C. Open Sent
- D. Active
Answer: B
NEW QUESTION # 299
Which of the following descriptions about the DHCPv6 address allocation process is correct?
- A. If it is necessary to renew the lease of the address obtained from the DHCPv6 server, a Rebind message will be sent at T1 to request lease renewal
- B. The DHCPv6 client uses the Solicit message to determine the location of the DHCPv6 server, and the destination IPv6 address of the message is FF02::1:3
- C. If the DHCPv6 server receives the Rebind message from the client and the server confirms that the client can continue to use the address, it will send a Confirm message to the client to inform the client
- D. The DHCPv6 server sends a Reply message carrying address and configuration information in response to the Request message received from the DHCPv6 client
Answer: D
NEW QUESTION # 300
ICMPv6 messages are classified as error or informational messages.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
ICMPv6 messages are classified into two types: error messages (e.g., Destination Unreachable, Time Exceeded) and informational messages (e.g., Echo Request, Echo Reply). This classification is fundamental to ICMPv6's operation .
NEW QUESTION # 301
The network administrator of a company checks the FIB of the router.
What fields does the FIB contain? (Multiple choice)
- A. TimeStamp
- B. Cost
- C. Destination/Mask
- D. Protocol
Answer: A,C
NEW QUESTION # 302
Which of the following descriptions of link aggregation in LACP mode is correct?
- A. In LACP mode, all active interfaces participate in data forwarding and share load traffic.
- B. In LACP mode, the devices at both ends of the link send LACP messages to each other.
- C. There can only be a maximum of 4 active ports in LACP mode.
- D. The number of active ports cannot be set in LACP mode.
Answer: B
NEW QUESTION # 303
Which of the following descriptions about 0SPF Stub area and Totally Stub area is wrong?
- A. The Totally Stub area does not allow S external routes to propagate in the area, nor does it allow inter-area routes to propagate in the area
- B. The E-bit bit in the Hello message sent by the routers in the Stub area is 0, and they will process the data packet with the E-bit 1
- C. A default route will be generated in the Stub area to ensure that the Stub area can reach the outside of the AS
- D. Access to other areas between the Totally Stub area is achieved through the default route delivered by 8 photos in this area
Answer: B
NEW QUESTION # 304
Which of the following statements is false about BFD?
- A. In asynchronous mode, two systems periodically exchange BFD Control packets at the negotiated interval. If one system does not receive any BFD Control packets from the other within the detection interval, the BFD session is declared down.
- B. In demand mode, after a BFD session is set up, the system does not periodically send BFD Control packets.
- C. The asynchronous mode does not support the echo function.
- D. The asynchronous mode is the primary BFD operating mode.
Answer: C
Explanation:
In asynchronous mode, two devices exchange BFD Control packets to monitor connectivity. However, this mode does support the echo function, which tests bidirectional paths by sending packets that loop back to the origin. This statement is incorrect. Demand mode, on the other hand, minimizes the control packet exchange, relying on periodic echo packets if configured. Huawei's BFD configuration guides emphasize these distinctions .
NEW QUESTION # 305
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Huawei H12-821_V1.0 certification is highly valued in the IT industry, especially in the field of data communication. HCIP-Datacom-Core Technology V1.0 certification demonstrates that the candidate has a solid understanding of data communication core technologies and is capable of designing and implementing complex network solutions. HCIP-Datacom-Core Technology V1.0 certification is also recognized by many leading companies in the IT industry, making it a valuable asset for professionals seeking employment in this field.
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