[Oct-2026] Use Real H12-821_V1.0 Dumps – 100% Free H12-821_V1.0 Exam Dumps [Q16-Q36]

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[Oct-2026] Use Real H12-821_V1.0 Dumps – 100% Free H12-821_V1.0 Exam Dumps

H12-821_V1.0 PDF Dumps Exam Questions – Valid H12-821_V1.0 Dumps

Huawei H12-821_V1.0 Exam Syllabus Topics:

Section	Objectives
Topic 1: Network Solutions	– Enterprise Network Solutions 1. Campus Network 2. Datacom Architecture 3. WAN Solution
Topic 2: WLAN	– Wireless Networking 1. Wireless Security 2. WLAN Deployment 3. WLAN Architecture
Topic 3: IS-IS	– IS-IS Fundamentals 1. LSP and SPF Mechanism 2. IS-IS Neighbor Establishment 3. Level-1 and Level-2 Routing
Topic 4: Network Security	– Security Technologies 1. ACL 2. Attack Prevention 3. AAA
Topic 5: Routing and Traffic Control	– Traffic Management 1. Route Filtering 2. Policy-based Routing 3. Traffic Optimization
Topic 6: BGP	– BGP Technologies 1. IBGP and EBGP 2. BGP Route Advertisement 3. BGP Path Selection
Topic 7: Network Reliability	– Reliability Technologies 1. Redundancy Design 2. VRRP 3. BFD
Topic 8: Routing Basics	– IP Routing Fundamentals 1. Routing Table Principles 2. Route Selection 3. Static Routing
Topic 9: Ethernet Switching Technology	– Switching Fundamentals 1. VLAN 2. STP/RSTP/MSTP 3. Link Aggregation
Topic 10: Multicast	– IP Multicast Technologies 1. IGMP 2. Multicast Forwarding 3. PIM
Topic 11: IPv6	– IPv6 Fundamentals 1. IPv6 Routing 2. IPv4 to IPv6 Transition 3. IPv6 Addressing
Topic 12: OSPF	– OSPF Fundamentals 1. OSPF Neighbor Relationship 2. LSA and SPF Calculation 3. OSPF Area Design
Topic 13: Network Service and Management	– O&M Technologies 1. Network Monitoring 2. Telemetry 3. SNMP

NO.16 Drag and Drop Question
Match the following IPv4 multicast protocols with the corresponding functions.

NO.17 The following figure shows the BGP state switching mechanism. Drag the following BGP states to the corresponding sequence numbers.

NO.18 In the MSTP protocol, each MSTI uses the RSTP algorithm independently to calculate a separate spanning tree.

TRUE

FALSE

NO.19 Which of the following events will cause IS-IS to generate a new LSP? (Multiple choice)

Adjacency Up or Down

The imported IP route sends changes

Periodic updates

The interface overhead has changed

NO.20 Which of the following description about OSPF DR is incorrect?

If the current DR fails, the current BDR will automatically become the new DR, and the BDR will be re- elected in the network

If the value of DR Priority is large, the priority will be elected as DR

When the DR Priority is the same, the one with the higher Router ID will be elected as the DR first

When a new router with greater DR Priority joins in the OSPF network, the new router will preempt the original DR

NO.21 Regarding the description of the routing tool, which of the following statement is wrong?

route-policy can only match routes and data packets, and cannot be used to modify routing attributes or data packet forwarding behavior

Prefix list (ip-prefix) matching object is the destination address of routing information

The access control list (ACL) is used to match the IP routing information or the address of the data packet

as-path-filter is used to match the AS-PATH attribute in BGP routing information, so it can only be used to filter BGP routes

NO.22 Which of the following descriptions about Filter-Policy are correct? (Multiple choice)

Filter-Policy can be used on both OSPFv2 and OSPFv3

In the distance vector protocol, because routing information is passed between devices, Filter-Policy can directly

Filtering In the link state routing protocol, the routing table is generated through the LSDB, so Filter- Policy essentially filters the LSA in the LSDB

In the distance vector protocol, if you want to filter out the route from the upstream device to the downstream device, you need to configure filter-policy export on the downstream device.

NO.23 The routing selection tool route-policy can filter and set BGP attributes based on predefined conditions, so it is often used to define policies for BGP Peer and is often used during route generation. By default, all unused Routes from the North Configuration are all rejected through route-policy.

TRUE

FALSE

NO.24 Which of the following descriptions about ACL classification numbers are correct? (Multiple choice)

Layer 2 ACL number range: 6000~6999

User-defined ACL number range: 5000~5999

User ACL, 7000~7999

Basic ACL number range, 2000~2999

Advanced ACL number range, 3000~4999

NO.25 A large shopping mall configures a VLAN pool to prevent network performance deterioration caused by potentially large broadcast domains.
A network engineer runs the display vlan pool name STA command to check information about the VLAN pool.
The following command output is displayed:
<AC> display vlan pool name STA Name : STA Total : 2 Assignment: hash Threshold Notify Count: 3 Threshold Notify time(min): 3 VLAN ID : 2 4
Which of the following statements are true?

The VLANs with the IDs of 2 and 4 are added to the VLAN pool.

The total number of VLAN pools is 2.

The name of the VLAN pool is STA.

The VLAN pool uses the even VLAN assignment algorithm.

NO.26 The Interface IP address and VRRP virtual IP address can be the same.

TRUE

FALSE

NO.27 Based on IGMP snooping, IGMP snooping proxy enables a switch to act as a substitute for an upstream Layer
3 device to send IGMP Query messages to downstream hosts, and also to act as a substitute for downstream hosts to send IGMP Report/Leave messages to an upstream device. As such, this function conserves bandwidth between the upstream device and the local device.

TRUE

FALSE

NO.28 BFD can quickly detect faults in channels at multiple network layers, ensuring high reliability. To which of the following layers does BFD belong?

Network layer

Application layer

Physical layer

Data link layer

NO.29 On an IS-IS network, all routers generate LSPs. Which of the following types of information is not contained in the LSPs generated by pseudonodes?

Interface information

Information about supported network protocols

Route information

Neighbor information

NO.30 On an OSPF network, an algorithm is used to prevent loops within an area, but loops may occur between areas. Therefore, OSPF defines a loop prevention mechanism for inter-area routes. Which of the following statements are true about the loop prevention mechanism?

Inter-area routes cannot be directly transmitted between non-backbone areas.

All non-backbone areas must be directly connected to area 0.

Inter-area routes need to be forwarded through area 0.

An ABR cannot inject Type 3 LSAs that describe routes to a network segment in an area back to thesame area.

OSPF Area Design and Loop Prevention:
OSPF uses a hierarchical structure with areas to improve scalability and efficiency. Area 0, the backbone area, plays a crucial role in ensuring loop-free route distribution between areas. The following mechanisms are key to preventing routing loops:
Strict adherence to hierarchical area design.
Prohibition of direct inter-area route exchanges between non-backbone areas.
HCIP-Datacom-Core Technology Training Material (OSPF Basics and Advanced Concepts).
Analysis of Each Statement:
A: Inter-area routes cannot be directly transmitted between non-backbone areas.This statement isTRUE.
OSPF mandates that all inter-area routing must pass through Area 0. Direct inter-area route exchanges between two non-backbone areas are not allowed to prevent loops.
Reference:HCIP-Datacom-Core Technology Training Material (Inter-Area Routing Mechanisms).
B: All non-backbone areas must be directly connected to area 0.This statement isTRUE. OSPF requires every non-backbone area to connect directly to Area 0 to facilitate loop-free inter-area routing. Virtual links may be configured in exceptional cases where direct connection is not possible.
Reference:HCIP-Datacom-Core Technology Training Material (OSPF Backbone and Area Connectivity).
C: Inter-area routes need to be forwarded through area 0.This statement isTRUE. All inter-area traffic must traverse Area 0 to ensure hierarchical routing and loop prevention. This rule is a core design principle of OSPF.
Reference:HCIP-Datacom-Core Technology Training Material (Routing Control and Loop Prevention in OSPF).
D: An ABR cannot inject Type 3 LSAs that describe routes to a network segment in an area back to the same area.This statement isTRUE. OSPF explicitly prohibits an ABR from injecting Type 3 LSAs describing a route into the same area where the route originates. This mechanism prevents routing loops within an area.
Reference:HCIP-Datacom Advanced Routing & Switching Technology (OSPF LSA Types and ABR Behavior).
Conclusion:All options (A, B, C, D) are correct. OSPF enforces a robust loop prevention mechanism through hierarchical routing, mandatory traversal via Area 0, and strict rules on LSA propagation by ABRs. This ensures reliable and loop-free inter-area routing in OSPF networks.

NO.31 On a broadcast IS-IS network shown in the following figure, a DIS needs to be elected to create and update pseudo nodes.

Which of the following routers is elected as the DIS?

NO.32 A port in the Discarding state in RSTP will discard the received data frames, but it can maintain the MAC address table based on the data frames received by the port.

TRUE

FALSE

NO.33 IGMP3 not only supports the general group query of IGMPv1 version and the specific group query of IGMPv2 version, but also supports the specified source/group query of IGMPv3 version.

TRUE

FALSE

NO.34 In which of the following scenarios can a neighbor relationshipnotbe established between two directly connected Huawei routers after IS-IS is configured?

The two routers are Level-2 routers with the same area address, and the interfaces connecting them are on the same network segment.

One router is a Level-1 router, and the other router is a Level-2 router.

The two routers are Level-2 routers and have different area addresses.

The two routers are Level-1 routers and have different area addresses.

NO.35 To prevent loops on an STP network, after a designated port is elected, it must wait for a long time and can forward packets only after the status of all ports on the entire network is determined. To solve this problem, RSTP uses the P/A mechanism to speed up the downstream port’s transition to the Forwarding state.

TRUE

FALSE

NO.36 As shown in the figure, in the MA network, if R1 must be DR, R2 must be BDR, and R3, R4, and R5 do not participate in the election, then the maximum dr-priority of R1 is (), and the dr-priority of R2 is the maximum is (), the dr-priority of R3 is (), the dr-priority of R4 is (), and the dr-priority of R5 is ().