[2025年更新]H12-821_V1.0試験問題集でテストエンジン練習テスト問題
合格できるH12-821_V1.0試験[2025年07月04日]最新302問題
質問 # 171
As shown in the figure, SWA, SWB, SWC, and SWD run the Rapid Spanning Tree Protocol (RSTP). Which of the following statements are true?
- A. Once receiving OPOUs, the edge port re-partlci pates in the calculation of the spanning tree.
- B. You can enable the edge port on SWC's GE0/0/2 connected to the terminal so that this port can quickly enter the forwarding state.
- C. After a port is Configured as an edge port, the port can quickly enter the Forwarding state.
- D. You can enable the edge port on SWD's GEO/0/2 connected to the terminal so that this port can quickly enter the Forwarding state.
正解：B、C、D
解説：
Edge ports are used in RSTP to bypass the spanning tree calculation for ports connected to end devices. By configuring ports like SWD's GE0/0/2 and SWC's GE0/0/2 as edge ports, they transition directly to the Forwarding state upon activation, ensuring faster convergence. Statement A is incorrect because receiving BPDU invalidates the edge port status .
質問 # 172
Four routers run ISIS and have established adjacencies. The area IDs and router levels are marked in the following figure. If route leaking is configured on R3, which of the following is the cost of the route from R4 to 10.0.2.2/32?
- A. 0
- B. 1
- C. 2
- D. 3
正解：C
質問 # 173
In the SNMP management model, which of the following elements defines the attributes of a managed device?
- A. Agent
- B. NMS
- C. Managed Object
- D. MIB
正解：D
解説：
In SNMP (Simple Network Management Protocol), the MIB (Management Information Base) defines the attributes of a managed device. It acts as a structured database of managed objects, each described by a unique OID (Object Identifier). These objects provide critical information and control interfaces for network management. Other elements like the agent (manages the MIB) and NMS (queries the agent) do not define attributes but interact with the MIB .
質問 # 174
Compared with STP, RSTP defines the different port states. Which of the following statements regarding discarding and learning states are true?
- A. The port In learning stole docs not learn MAC addresses table.
- B. The port in discarding state does not learn MAC addresses table.
- C. The port In discarding or learning state does not forward data frames.
- D. The port in discarding or learning state does not learn MAC addresses
正解：B、C
解説：
In RSTP, a port in the discarding state neither forwards data frames nor learns MAC addresses. A port in the learning state does not forward data frames but starts learning MAC addresses. Therefore, options A and B are correct, while C and D are incorrect due to misunderstandings of these states .
質問 # 175
Which of the following statement regarding the display ospf peer command output is true?
- A. The DR address is 10.1.1.1
- B. Through negotiation during DD packet exchange, the local end becomes the slave.
- C. Address: 10.1,1.1 Indicates that the local interface address is 10.1.1.1.
- D. Router ID indicates that the local router ID Is 10.1.1.1.
正解：B
解説：
The command output indicates that the OSPF neighbor state is Full and that the neighbor relationship has been established. The statement confirms that the negotiation process during the exchange of DD (Database Description) packets has determined the role of the router, with the local device becoming the slave in the Master-Slave relationship, which is critical for LSA synchronization. The other options do not align with the output or OSPF principles
質問 # 176
A route-policy consists of one or more nodes. What is the maximum number of nodes in a route-policy?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
解説：
Comprehensive and Detailed Step-by-Step Explanation:
* Route Policy Overview:
* A route-policy is a policy-based routing tool that filters and modifies routing information.
* It consists of one or more nodes, and each node can specify match conditions and apply actions to routes.
* Maximum Number of Nodes:
* The maximum number of nodes supported in a route-policy is 1024, allowing flexibility in route filtering and control.
References:
* HCIA-Datacom Study Guide, Chapter: Route-Policy Configuration
* Huawei Route-Policy Configuration Guidelines
質問 # 177
ACLs are a common tool for matching routes. ACLs are classified into multiple types based on ACL rule functions. An ACL can be identified by a number, and the number range for each type of ACLs is different.
Which of the following type of ACLs are numbered from 4000 to 4999?
- A. Advance ACL
- B. Basic ACL
- C. Layer 2 ACL
- D. User-defined ACL
正解：D
解説：
ACL Number Ranges
* Basic ACLs: Numbered from 2000 to 2999.
* Advanced ACLs: Numbered from 3000 to 3999.
* Layer 2 ACLs: Numbered from 5000 to 5999.
* User-defined ACLs: Numbered from 4000 to 4999.
HCIP-Datacom-Core Reference
* ACL classifications and their number ranges are covered in the ACL principles and configuration chapters.
質問 # 178
Which of the following attributes cannot be directly referenced in an apply clause of a route-policy?
- A. IP-prefix
- B. tag
- C. origin
- D. community
正解：A
解説：
Attributes such as community, tag, and origin can be directly referenced in the apply clause of a route-policy.
However, IP-prefix is not an attribute but a prefix list used for matching, and it cannot be directly applied .
質問 # 179
BFD can quickly detect faults in channels at multiple network layers, ensuring high reliability. To which of the following layers does BFD belong?
- A. Physical layer
- B. Data link layer
- C. Application layer
- D. Network layer
正解：D
解説：
BFD operates at the network layer, providing rapid fault detection for forwarding paths, such as IP routing and MPLS tunnels. It interacts closely with network protocols (e.g., OSPF, BGP) to ensure high reliability and quick response to faults. BFD does not belong to the application, data link, or physical layers but functions as a network layer diagnostic tool as confirmed in Huawei's network protocol training .
質問 # 180
The typical characteristics of the AI era are that it focuses on data, explores data value, and improves AI efficiency. Therefore, the core requirement of AI for data center networks is speed, meaning low latency.
- A. TRUE
- B. FALSE
正解：A
解説：
AI-driven networks focus on maximizing efficiency by minimizing latency to enhance data processing and decision-making speed. The AI era emphasizes leveraging large data volumes and ensuring rapid data center interconnectivity. This makes low latency a critical requirement for AI-ready data center networks, as highlighted in Huawei's AI and data center network optimization materials .
質問 # 181
In VRRP networking, devices assume the Master and Backup roles after election. Match the two roles with their working mechanisms.(Token is reusable)
正解：
解説：
A screenshot of a computer Description automatically generated
Explanation of VRRP Roles and Their Functions:
In VRRP (Virtual Router Redundancy Protocol), devices are assigned roles as either Master or Backup after an election process. Each role has specific responsibilities to ensure the availability of the virtual IP address.
Matching Roles and Mechanisms:
Master:
* Periodically send VRRP Advertisement packets.
* The Master device sends advertisement packets to inform Backup devices that it is active.
* Respond to an ARP request destined for a virtual IP address with an ARP reply carrying the virtual MAC address.
* The Master device is responsible for responding to ARP requests for the virtual IP and forwarding traffic for it.
Backup:
* Transition from Master to Backup immediately if a VRRP Advertisement packet with a higher priority is received.
* A Backup device becomes Master only if the current Master stops sending advertisement packets or has a lower priority.
* Discard IP packets destined for the virtual IP address.
* Backup devices do not process traffic for the virtual IP address unless they become the Master.
質問 # 182
VRRP is implemented based on the priority and preemption functions of VRRP routers. Which of the following statements is false about the VRRP solution?
- A. When preemption is disabled, a backup device does not preempt the master role even if it has a higher priority than the current master, provided that the current master is working properly.
- B. When preemption is enabled, a backup device preempts the master role if it has a higher priority than the current master.
- C. The master periodically sends VRRP Advertisement packets in the VRRP group to advertise its configurations such as the priority.
- D. Even if the VRRP device is the IP address owner, it still needs to participate in the election and does not directly transition to the Master state when receiving a message indicating that the interface goes Up.
正解：D
解説：
Comprehensive and Detailed In-Depth Explanation:
* A. TRUE # If preemption is enabled, a higher-priority router can take over as the Master.
* B. TRUE # If preemption is disabled, the current Master remains active even if a higher-priority router joins.
* C. TRUE # The Master router sends VRRP Advertisement packets to maintain its role.
* D. FALSE # If a VRRP router is the IP address owner, it automatically becomes the Master without needing to participate in an election.
# Reference: Huawei HCIA-Datacom Study Guide, VRRP Priority and Preemption Mechanisms.
質問 # 183
On the OSPF network shown in the figure, R1, R2, and R3 run OSPF, and R1 advertises four VPN routes to OSPF. A filter-policy needs to achieve the following goal: R1's and R3's routing tables contain the routes to 192.168.3.0/24, but R2's routing table does not. Which of the following filter-policies cannot meet this requirement?
- A. A filter-policy on R1 for filtering the imported routes to be advertised
- B. A filter-policy on R2 for filtering the routes to be advertised
- C. A filter-policy on R1 for filtering the routes to be imported
- D. A filter-policy on R2 for filtering received routes
正解：C
解説：
* Goal Analysis:
* Requirement:
* The route to 192.168.3.0/24 must exist in R1's and R3's routing tables.
* The route must not exist in R2's routing table.
* This requires filtering to ensure the route is either:
* Blocked on R2's routing table (via filtering on R2), or
* Blocked before it is advertised to R2.
* Analysis of Each Option:
* Option A (Filter-policy on R2 for filtering received routes):
* Applying a filter-policy on R2 to filter received routes will block the route from entering R2's routing table but still allow it to propagate to R3.
* This meets the requirement.
* Option B (Filter-policy on R2 for filtering the routes to be advertised):
* Blocking the advertisement of routes from R2 to other routers does not affect the routes received by R2 itself.
* This does not meet the requirement but does not affect the propagation to R3.
* This is valid if the received route is blocked.
* Option C (Filter-policy on R1 for filtering the routes to be imported):
* If the route is filtered on R1 during the import phase, the route will not exist in R1's routing table and thus cannot be advertised to either R2 or R3.
* This fails to meet the requirement because the route must exist in R1's and R3's routing tables.
* Option D (Filter-policy on R1 for filtering the imported routes to be advertised):
* Filtering routes on R1 before advertising to R2 will prevent R2 from receiving the route but allow R1 to advertise the route to R3.
* This meets the requirement.
* Correct Option:
* C (Filter-policy on R1 for filtering the routes to be imported): This will prevent the route from existing in both R1 and R3, violating the stated requirement.
References:
* HCIA-Datacom Study Guide, Chapter: OSPF Route Filtering
* Huawei OSPF Configuration and Filtering Methods
質問 # 184
BFD control packets are encapsulated in UDP packets for transmission. What is the destination port number of multi-hop BFD control packets?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
質問 # 185
Which of the following parameters are not mandatory during the configuration of a BGP peer?
- A. as-number
- B. Peer IP address
- C. password
- D. description
正解：C、D
解説：
The mandatory parameters for BGP peer configuration are the peer IP address (peer ip-address) and AS number (as-number). A password is optional for MD5 authentication, and a description is an optional comment for reference. These are not required for establishing the peer relationship .
質問 # 186
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