Exam Name: HCIP-Datacom-Core Technology V1.0
Certification Provider: Huawei
Corresponding Certification: HCIP-Datacom
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Instant Download Huawei : H12-821_V1.0 Questions & Answers as PDF & Test Engine
Updated: Oct 08, 2026
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Huawei H12-821_V1.0 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| IS-IS | - IS-IS Fundamentals
|
| WLAN | - Wireless Networking
|
| BGP | - BGP Technologies
|
| Network Service and Management | - O&M Technologies
|
| Ethernet Switching Technology | - Switching Fundamentals
|
| Network Solutions | - Enterprise Network Solutions
|
| Routing and Traffic Control | - Traffic Management
|
| IPv6 | - IPv6 Fundamentals
|
| Routing Basics | - IP Routing Fundamentals
|
| OSPF | - OSPF Fundamentals
|
| Multicast | - IP Multicast Technologies
|
| Network Reliability | - Reliability Technologies
|
| Network Security | - Security Technologies
|
Huawei HCIP-Datacom-Core Technology V1.0 Sample Questions:
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?
- A. Alternative port, backup port
- B. Backup port, root port
- C. Root port, designated port
- D. Backup port, alternative port
Correct Answer: C 🗳️
Explanation: Only visible for ActualVCE members. You can sign-up / login (it's free).
BFD provides fast fault detection independent of media and routing protocols. To use this mechanism to detect link connectivity, devices at both ends must support this feature.
- A. TRUE
- B. FALSE
Correct Answer: A 🗳️
Explanation: Only visible for ActualVCE members. You can sign-up / login (it's free).
R1, R2, R3, and R4 run IS-IS, and the DIS priorities of their interfaces are shown in the following figure. If all these devices are started simultaneously, will be elected as the DIS. (Enter the device name, for example, R1.)
Correct Answer:
R4
Explanation:
DIS Election in IS-IS:
In IS-IS, the Designated Intermediate System (DIS) is elected on broadcast networks to reduce the number of LSAs exchanged and maintain the LSDB.
The DIS is elected based on priority:
The router with the highest priority is elected as the DIS.
If priorities are equal, the System ID is used as a tie-breaker, and the router with the highest System ID becomes the DIS.
HCIP-Datacom-Core Technology Training Material (IS-IS DIS Election Mechanism).
Given DIS Priorities:
R1: Priority = 10
R2: Priority = 20
R3: Priority = 30
R4: Priority = 40
R4 has the highest DIS priority of 40, which makes it the clear choice for DIS election.
Scenario Details:
Since all devices are started simultaneously, the DIS election process will follow the priorities without requiring a tie-breaker (System ID).
Conclusion:
The device with the highest DIS priority is R4, and it will be elected as the DIS.
ACLs are a common matching tool in routing policies. An ACL can be configured on a router to match routes.
- A. TRUE
- B. FALSE
Correct Answer: A 🗳️
Explanation: Only visible for ActualVCE members. You can sign-up / login (it's free).
Match the following IPv4 multicast protocols with the corresponding functions.
Correct Answer:
Explanation:
IGMP: Manages IPv4 multicast group members and runs on the multicast network's last segment (that is, the network segment where a Layer 3 network device is connected to user hosts).
PIM: Sends multicast data over the network to the multicast device that is connected to group members that have requested the multicast data, implementing multicast data forwarding based on routes.
IGMP Snooping: Manages and controls the forwarding of multicast data packets to effectively suppress the flooding of multicast data packets on the Layer 2 network.
IGMP (Internet Group Management Protocol):
IGMP is used by hosts and adjacent multicast routers to establish and maintain multicast group memberships on a local subnet.
It allows a host to inform a multicast router of its desire to receive multicast traffic for a specific group.
It operates at Layer 3 and runs on the last segment of the network.
HCIP-Datacom-Core Technology Training Material (Multicast Fundamentals).
PIM (Protocol Independent Multicast):
PIM is a routing protocol designed for efficient routing of IP multicast traffic. It determines the paths over which multicast packets should be forwarded.
PIM is "protocol-independent" because it uses the underlying unicast routing table for RPF (Reverse Path Forwarding) checks.
It is responsible for distributing multicast data throughout the network.
Reference: HCIP-Datacom-Core Technology Training Material (Multicast Routing Protocols).
IGMP Snooping:
IGMP Snooping operates at Layer 2 and monitors IGMP traffic between hosts and routers.
It prevents multicast flooding by allowing a switch to forward multicast packets only to the ports that have joined specific multicast groups.
This significantly enhances efficiency in Layer 2 networks with multicast traffic.
Reference: HCIP-Datacom-Core Technology Training Material (IGMP Snooping Concepts).
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