Oct-2026 Pass Your H12-821_V1.0 Exam at the First Try with 100% Real Exam [Q15-Q32]

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Oct-2026 Pass Your H12-821_V1.0 Exam at the First Try with 100% Real Exam

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Huawei H12-821_V1.0 (HCIP-Datacom-Core Technology V1.0) Exam is a certification exam designed for IT professionals who wish to develop their skills and knowledge of data communication technologies. H12-821_V1.0 exam is specifically created for individuals who want to become a Huawei Certified ICT Professional (HCIP) in the field of data communication. H12-821_V1.0 exam is conducted by Huawei Technologies Co. Ltd, a leading global provider of information and communications technology (ICT) infrastructure and smart devices.

NO.15 Route attributes are specific descriptions of routes. BGP route attributes can be classified into four types.
Which of the following are well-known discretionary attributes?

Atomic_Aggregate

Local-Preference

Community

MED

Comprehensive and Detailed Step-by-Step Explanation:
1. BGP Attributes Overview:
BGP uses attributes to describe the properties of routes. These attributes are classified into the following categories:
Well-Known Mandatory: Attributes that must be recognized and included in every BGP update. Examples:
AS_PATH, ORIGIN, NEXT_HOP.
Well-Known Discretionary: Attributes that must be recognized but are not required in every BGP update.
Examples: LOCAL_PREF, ATOMIC_AGGREGATE.
Optional Transitive: Attributes that may or may not be recognized, but must be passed along to other BGP peers. Examples: COMMUNITY.
Optional Non-Transitive: Attributes that may or may not be recognized, and are not passed along to other BGP peers. Examples: MED (Multi-Exit Discriminator).
2. Analysis of Each Option:
Option A: Atomic_Aggregate
Correct.
This is a well-known discretionary attribute. It indicates that the advertised route is an aggregate route that summarizes multiple specific routes.
Option B: Local-Preference
Correct.
This is a well-known discretionary attribute. It is used within an AS to prioritize routes, with higher values being preferred.
Option C: Community
Incorrect.
The COMMUNITY attribute is an optional transitive attribute. It is used to tag routes with specific labels to apply routing policies.
Option D: MED (Multi-Exit Discriminator)
Incorrect.
The MED attribute is an optional non-transitive attribute. It is used to influence the choice of the preferred path when there are multiple entry points into an AS.
3. Summary:
Well-Known Discretionary Attributes: Atomic_Aggregate and Local-Preference.
Huawei HCIA-Datacom Study Guide, Chapter “BGP Route Attributes.”
RFC 4271: Border Gateway Protocol 4 (BGP-4).

NO.16 Which of the following IEEE 802.11 standards corresponds to Wi-Fi 6?

802.11ac

802.11n

802.11b

802.1lax

NO.17 Part of the configuration of a router is shown in the figure, so which of the following descriptions about this part of the configuration is correct?
[HUAWEI] ip ip-prefix plpermit 10.0.192.0 8 greater-equal 17 less-equal 18

In the 10.0.192.0/8 network segment, the route with a mask length of 19 will match the prefix list, and the matching rule is allowed

In the 10.0.192.0/8 network segment, the route with a mask length of 21 will match the prefix list, and the matching rule is allowed

In the 10.0.192.0/8 network segment, the route with a mask length of 18 will match the prefix list, and the matching rule is allowed

In the 10.0.192.0/8 network segment, the route with a mask length of 20 will match the prefix list, and the matching rule is allowed

NO.18 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.19 The Next_Hop attribute in BGP records the next hop of a route. Similar to the next hop in an IGP, the Next_Hop attribute in BGP must be the IP address of a peer interface.

TRUE

FALSE

BGP Next_Hop Attribute
* Unlike IGP, the Next_Hop attribute in BGP does not necessarily have to be the IP address of a peer interface. For example, in multi-hop BGP configurations, the Next_Hop can point to a different router or interface within the network.
HCIP-Datacom-Core Reference
* Details of the Next_Hop attribute and its behavior are outlined in BGP path selection principles.

NO.20 The figure shows the WLAN topology of an enterprise, where the direct forwarding mode is used. Which of the following is the data forwarding path after inter-AC Layer 2 roaming?
Exhibit:

WLAN Layer 2 roaming topology with HAC, FAC, HAP, FAP, SW1, SW2, and VLAN 10

STA – > FAP – > SW2 – > Internet

STA – > FAP – > SW2 – > FAC – > HAC – > SW1 – > HAP – > HAC – > SW1 – > Internet

STA – > FAP – > SW2 – > FAC – > HAC – > SW1 – > HAP – > SW1 – > Internet

STA – > FAP – > SW2 – > FAC – > HAC – > SW1 – > Internet

Inter-AC Layer 2 roaming allows a wireless station (STA) to move between access points managed by different ACs while maintaining its IP address and service VLAN.
In the exhibit, both the Home AP (HAP) and Foreign AP (FAP) provide access to VLAN 10.
After roaming, the STA associates with the FAP.
Because direct forwarding is configured, user data is forwarded locally through the FAP ‘ s connected switch rather than being sent through a CAPWAP tunnel to the home AC or AP.
The forwarding path is therefore:
STA – > FAP – > SW2 – > Internet
The HAC and FAC continue coordinating roaming-related control information, but they do not need to forward this service traffic.
Huawei ‘ s inter-AC Layer 2 roaming material confirms that direct forwarding uses the foreign AP and local gateway.

NO.21 Which statement about multicast packet forwarding is correct?

The source address of the multicast packet is a unicast address

In the multicast transmission mode, the destination address of the message can clarify the location of the receiver

The failure of the RPF check indicates that the multicast data packet is received from the suboptimal interface, but the inbound interface will still receive the multicast traffic and forward it downstream

The IGMP Snooping function cannot control the range of multicast traffic flooding on the Ethernet

NO.22 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.23 In the PIM protocol, which of the following packets have destination addresses that are unicast addresses? (Multiple choice)

Assert

Bootstrap

Graft

NO.24 A wireless access controller interface has both the DHCP server function and the DHCP relay function enabled.
So which of the following descriptions of the processing method of the wireless access controller are correct? (Multiple choice)

Prioritize using the local DHCP server to assign IP addresses

Use both the local DHCP server and the remote DHCP server to assign IP addresses

Only when the local server cannot assign an IP address, the remote server will be used to assign an IP address.

Prioritize using the remote DHCP server to assign IP addresses

NO.25 In BGP, MED is mainly used to affect BGP route selection between ASs. The smaller the MED attribute value, the better the BGP route. By default, the BGP MED value of Huawei equipment is _______.

NO.26 Through the following display commands, by which of the following you can judge whether the switch loop failure is caused?

[CE02] displaytrapbuffer Pleasecheckthenetworkaccessedtoflappingport

[CE02] displaycpu-usage

[CE02] displaycpu-defendstatistics

[CE02] displayinterfacebriefincludeup

NO.27 Which of the following are the advantages of building a campus network using stacking and clustering technologies? (Multiple choice)

Business interruption time is greatly reduced

Simplify network management and reduce the complexity of network deployment planning

Can effectively reduce network power consumption

Prompt utilization of network devices and links

NO.28 A Huawei firewall by default creates security zones named untrust, dmz, _________ and local. (Use Lowercase letters.)

TRUST
Explanation:
By default, Huawei firewalls create security zones named untrust, dmz, trust, and local. These zones facilitate security policies for inbound, outbound, and inter-zone traffic control .

NO.29 What is the correct procedure for a VLAN pool to assign terminals to VLANs.

NO.30 The BFD version number supported by the VRP version is:

version 3

Version 2

Version 1

Version 4

NO.31 A switch runs MSTP. The configuration is shown in the figure. What is the role of this switch in MSTI 1?

Uncertain

Root switch

Non-root switch

Secondary root switch

Based on the MSTP configuration shown, the role of the switch in MSTI 1 cannot be determined without additional details about the topology or priority values of other switches in the instance. The role could be a root switch, secondary root, or non-root, depending on these factors .

NO.32 BGP can select routes based on the AS_Path attribute. Therefore, in some cases, a route-policy needs to be used to modify the AS_Path attribute for route selection. Which of the following parameters can be specified in the apply as-path command for a route-policy to modify this attribute?

Delete

Additive

Copy

Overwrite

Comprehensive and Detailed Step-by-Step Explanation:
1. Overview of AS_Path Attribute Modification:
The apply as-path command in a route-policy is used to modify the AS_Path attribute of routes. This is often required to influence the selection of routes or to adjust routing policies for incoming or outgoing BGP updates.
2. Parameters of the apply as-path Command:
Option A: Delete
Correct.
The delete parameter removes specific AS numbers from the AS_Path attribute. This is used to simplify or manipulate the AS_Path for specific routing policies.
Option B: Additive
Correct.
The additive parameter appends an AS number to the existing AS_Path attribute, instead of overwriting it.
This is useful when you want to prepend AS numbers to influence route selection without removing the original AS_Path.
Option C: Copy
Incorrect.
The copy parameter is not supported in the apply as-path command for modifying AS_Path attributes.
Option D: Overwrite
Correct.
The overwrite parameter replaces the existing AS_Path with a new one. This provides complete control over the AS_Path attribute but removes the original AS_Path entirely.
3. Summary:
The valid parameters for the apply as-path command are delete, additive, and overwrite.
Huawei HCIA-Datacom Study Guide, Chapter “BGP Route Policies.”
BGP Attribute Modification in Huawei Documentation.

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Huawei H12-821_V1.0: HCIP-Datacom-Core Technology V1.0 exam is an important certification for professionals who are interested in enhancing their skills and knowledge in the field of data communication. HCIP-Datacom-Core Technology V1.0 certification is highly valued by employers and demonstrates the candidate’s ability to apply core concepts of data communication in practical situations. With proper preparation and study, candidates can pass the exam and advance their career in this exciting and growing field.

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