[May-2026] Verified Huawei Exam Dumps with H12-821_V1.0 Exam Study Guide [Q370-Q392]

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[May-2026] Verified Huawei Exam Dumps with H12-821_V1.0 Exam Study Guide

Best Quality Huawei H12-821_V1.0 Exam Questions ExamsTorrent Realistic Practice Exams [2026]

Huawei H12-821_V1.0 certification exam is intended for professionals who have experience working with Huawei data communication products and solutions. H12-821_V1.0 exam is designed to test candidates’ understanding of the latest technologies and trends in the field of data communication, and their ability to apply this knowledge to real-world scenarios. HCIP-Datacom-Core Technology V1.0 certification is suitable for network engineers, network architects, and other IT professionals who are responsible for designing and managing data communication networks in their organizations. It is a valuable credential that can help IT professionals advance their careers and increase their earning potential.

NO.370 Similar to OSPF, the two routers establishing a BGP peer relationship must be directly connected.

TRUE

FALSE

NO.371 An enterprise uses Huawei routers to deploy an IS-IS network for network-wide communication. An engineer wants to change the interface cost to control route selection. By default, which of the following values is the maximum cost that can be configured?

Comprehensive and Detailed in-depth Step-by-Step Explanation:
In IS-IS, theinterface costis a metric used to determine the best path to a destination. Lower-cost paths are preferred over higher-cost paths. By default, IS-IS interface costs can range from1 to 63.
Default Cost Range:
IS-IS allows the configuration of interface costs within the range of1-63by default. This range is sufficient for most networks.
Maximum Configurable Cost:
The maximum value that can be configured by default is63. If there is a requirement for a higher cost range, the metric-style can be changed towide, which allows the cost range to extend beyond 63.
Option A (67):Incorrect. 67 is not the maximum default value.
Option B (63):Correct. This is the maximum default cost value.
Option C (64):Incorrect. This is beyond the default range.
Option D (68):Incorrect. This is beyond the default range.
References:
Huawei HCIA-Datacom Study Guide, Chapter on “IS-IS Cost and Route Selection”.
RFC 5308 – Routing IPv6 with IS-IS.

NO.372 In a network environment, there are both switches running RSTP and switches running SIP, then the phenomenon that will appear in this network is: (Multiple choice)

If it is a Huawei switching device, RSTP will switch to STP mode. After the STP switching device is withdrawn from the network, the RSTP -running switching device can migrate back to the RSTP working mode

RSTP can interoperate with STP, but at this time RSTP advantages such as fast convergence are lost

RSTP and STP are not interoperable and will perform independent operations

If it is a Huawei switching device, the STP will switch to RSTP mode, and the switching device running RSTP can be configured to switch back to the RSTP working mode after the switching device is removed from the network.

NO.373 In the BGP protocol, which of the following BGP attributes can be used to mark routes with certain common characteristics so that other BGP routers can identify them?

Community

AS-path

Origin

MED

NO.374 As shown in the figure, router HqE runs two processes, OSPF1 and OSPF 2. The administrator received a request to introduce the two network segments
10.0.1.0/24 and 10.0.4.0/24 in OSPF 2 to OSPF. 1, then to analyze the configuration in the figure, you need to enter the filter-policy ip-prefix Hw () command in the OSPF 1 view.

import-route ospf 2

NO.375 See the network shown in the following figure.

R1 and R2 run IS-IS and establish an adjacency. IS-IS is enabled on Loopback0 of R2 but disabled on Loopback3 of R2. The configurations shown in the figure are performed in the IS-IS process of R2. Which of the following statements are true?

The routing table of R1 contains the route 10.0.2.3/32.

The routing table of R1 does not contain the route 10.0.2.3/32.

The routing table of R1 does not contain the routes 10.0.2.2/32 and 10.0.2.3/32.

The routing table of R1 contains the route 10.0.2.2/32.

In the provided configuration, IS-IS is enabled on Loopback0 but not on Loopback3 of R2. As a result, R2 will advertise the route 10.0.2.2/32 (from Loopback0) to R1 through IS-IS. However, the route 10.0.2.3/32 will not be advertised because IS-IS is not enabled on that loopback interface. The import-route direct command does not override this behavior .

NO.376 Which of the following statements is true about BGP?

If the export routing policy applied to a BGP peer changes, manual intervention is required so that the device resends Update messages to the peer.

IGP routes can be converted into BGP routes only through the network command.

A router cannot be configured with multiple BGP processes.

Open messages carry only the BGP header.

Export Routing Policy Changes
When an export routing policy is modified, BGP does not automatically resend affected routes. Manual intervention, such as a clear ip bgp command, is required to resend Update messages reflecting the new policy.

NO.377 When two routers establish a pair of logical BGP peers through a multi-hop physical link, the peer connect-interface command must be used.

TRUE

FALSE

NO.378 An enterprise uses OSPF to implement network communication. To ensure data validity and security, all authentication modes supported by OSPF are enabled on routers. In this case, interface authentication is preferentially used by the routers.

TRUE

FALSE

OSPF supports three authentication modes:
Null Authentication: No authentication (default).
Plaintext Authentication: Uses clear-text passwords.
MD5 Authentication: Secure cryptographic authentication.
Interface-Level Priority
When both interface-level and area-level authentication are configured, OSPF prioritizes interface-level authentication. This ensures that interface-specific security overrides area-wide configurations for greater granularity and security.

NO.379 In the DU label distribution mode, if the Liberal retention mode is used, the device will retain the labels sent by all LDP Peers, regardless of whether the LDP Peer is the next hop to the destination network segment.

TRUE

FALSE

NO.380 Please match the following BGP messages with their functions

NO.381 Which routes in the options below satisfy the ACL conditions below? (Multiple choice) [HUAWEI] acl number 2001
[HUAWEI-acl-basic-2001] rule 0 permit source 10.1.1.0 0.0.254.255

10.1.1.1/32

10.1.2.1/32

10.1.3.1/32

10.1.4.1/32

NO.382 The AS_Path attribute records the numbers of all ASs that a route passes through from the local end to the destination in the vector order. If a BGP speaker advertises a route to an IBGP peer, it creates an empty AS_Path in an Open message. This prevents routing loops between ASs.

TRUE

FALSE

NO.383 The command format of the prefix list (IP-Prefx) is ip ip-prefx ip-prefix-name [index index-number] permit | deny] ipv4-address mask-length [ greater-equal greater- equal-value] [less -equal less-equal- value], if only greater-equal is specified and less-equal is not specified, the prefix range is:

[0. greater-equal-value]

Unlimited

[mask-length, greater-equal-value]

[greater-equal-value.32]

NO.384 As shown in the figure, STA and STB run the RSTP protocol, and the Cost of Path remains the default.

Which of the following descriptions of device and port status is correct?

GE0/0/1 on STA is the Backup port

GE0/0/2 on the STB is the Alternate port

STB will become the root bridge

GE0/0/1 on the STB is the AI ternate port

NO.385 The OSPF protocol has authentication capabilities for all data packets exchanged between neighboring routers.
In the VRP system, which of the following algorithms does OSPF support?

AES

DES

MD5

RSA

NO.386 Execute the () saved-configuration command to clear the contents of the configuration file used for the next startup of the device, and unspecify the configuration file used for the next startup of the system, thereby restoring the device configuration to the default value.

reset

NO.387 As shown in the figure, SWA, SWB, and SWC run the Rapid Spanning Tree Protocol (RSTP). What are the roles of SWB’s GE0/0/2 and SWC’s GE0/0/1?

Backup port, alternative port

Alternative port, backup port

Backup port, root port

Root port, designated port

In the topology, SWB’s GE0/0/2 is the Root Port because it has the least cost path to the Root Bridge (SWA).
SWC’s GE0/0/1 is the Designated Port because it forwards traffic to SWA while maintaining the shortest path to the Root Bridge. This setup ensures efficient traffic flow in the spanning tree topology .

NO.388 Because multicast data forwarding relies on routing table entries, problems such as loops and suboptimal paths will not occur during the forwarding process.

TRUE

FALSE

NO.389 Which of the following descriptions about BGP loop protection is correct? (Multiple choice)

A BGP router will not announce any updates from EBGP peers to its EBGP peers

Non-RR BGP routers will not announce any updates from IBGP peers to other IBGP peers

Through the AS-PATH attribute, discard any update information received from the EBGP peer that contains its own AS number in the AS-PATH attribute

Any routing information from an IBGP peer will be advertised to other IBGP peers

NO.390 Which of the following descriptions of IS-IS area division are correct? (Multiple choice)

In IS-IS, Level1-1-2 routers connect the backbone area and non-backbone area.

In IS-IS, different interfaces of a single router can belong to different areas

Ports can belong to different areas. In IS-IS, a fixed area is defined as a backbone area.

In IS-IS, each router can only belong to one area.

NO.391 Which of the following parameters are involved in the election of DIS in IS-IS? (Multiple choice)

Priority

Router ID

IP address

MAC address

NO.392 Which of the following statements about IGMPv2 routers maintaining segment group membership are correct? (Multiple choice)

After receiving the Leave message, the router immediately removes the members of the group

The router queries for a specific group

The router maintains a timeout timer for each group membership

After the router sends a general group query message, all receivers need to respond within the maximum response time

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Huawei H12-821_V1.0 certification exam is an industry-recognized certification that is highly regarded by many organizations. HCIP-Datacom-Core Technology V1.0 certification exam is designed to test the knowledge and skills of candidates in the area of datacom core technology. Candidates who successfully pass this certification exam will be able to demonstrate their understanding of the latest technologies and best practices in datacom core technology.

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