[2026] Pass Huawei H12-821_V1.0 Test Practice Test Questions Exam Dumps
Verified H12-821_V1.0 dumps Q&As - H12-821_V1.0 dumps with Correct Answers
NEW QUESTION # 672
On an OSPF network, LSDBs are used to store LSAs. Common LSAs include router LSAs and network LSAs. Which of the following items is not included in the 3-tuple that is used to uniquely identify an LSA?
- A. LSType
- B. Link State ID
- C. LS Sequence Number
- D. Advertising Router
Answer: C
Explanation:
Comprehensive and Detailed in-depth Step-by-Step Explanation:In OSPF, Link State Advertisements (LSAs) are used to exchange routing and topology information. Each LSA in the OSPF network is uniquely identified using a 3-tuple identifier, which consists of:
* Link State ID:
* The Link State ID uniquely identifies the LSA within the OSPF area. Its value depends on the LSA type. For example, for a Router LSA, the Link State ID is the originating router's Router ID.
* Advertising Router:
* This is the Router ID of the router that generated the LSA. It identifies which router is responsible for creating and advertising this LSA.
* LSType:
* This field identifies the type of LSA (e.g., Router LSA, Network LSA, Summary LSA, AS- External LSA, etc.). It is crucial for interpreting the purpose and content of the LSA.
The LS Sequence Number is not part of the 3-tuple that uniquely identifies the LSA. Instead, it is used to determine the most recent version of the LSA in case there are multiple instances of the same LSA.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "OSPF LSAs and LSDBs".
* RFC 2328 - OSPF Version 2 (Section 12.1.6).
NEW QUESTION # 673
Which of the following parameters are involved in the election of DIS in IS-IS? (Multiple choice)
- A. Router ID
- B. Priority
- C. IP address
- D. MAC address
Answer: B,D
NEW QUESTION # 674
As shown in the figure, the ISIS neighbor relationship between R1 and R2 has just been established, and the database synchronization process between R1 and R2 is correct?
- A. The packet sent by R1 to R2 is a Hello packet.
- B. The packet sent by R1 to R2 is an LSP packet.
- C. The packet sent by R1 to R2 is a CSNP packet.
- D. The packet sent by R1 to R2 is a PSNP packet.
Answer: C
NEW QUESTION # 675
Which of the following values can be set for the security level of the security zone customized by the USG series firewall? (Multiple choice)
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B,D
NEW QUESTION # 676
Which of the following message types does BGP include? (Multiple choice)
- A. Open
- B. Keepalive
- C. Hello
- D. Update
Answer: A,B,D
NEW QUESTION # 677
An IP prefix list is configured on a router using the following command:
ip ip-prefix huawei index 10 permit 10.1.1.0 24 greater-equal 26
In this case, the value ofgreater-equal-valueis ____, and the value ofless-equal-valueis ____.
Answer:
Explanation:
greater-equal-value: 26 ,less-equal-value: 32
Explanation:
1. Understanding Prefix List Configuration:
The command ip ip-prefix huawei index 10 permit 10.1.1.0 24 greater-equal 26 defines a prefix filter:
The base prefix is 10.1.1.0/24.
The greater-equal 26 condition specifies that the mask length of matching prefixes must beat least 26 bits.
If the less-equal parameter is not explicitly defined, the default value is32, meaning the longest possible mask length for IPv4.
2. Explanation of Values:
greater-equal-value: Specifies the minimum mask length. In this case, the value is26.
less-equal-value: Specifies the maximum mask length. Since it is not explicitly configured, the default value is32.
3. Summary:
greater-equal-value = 26
less-equal-value = 32
Huawei HCIA-Datacom Study Guide, Chapter "IP Prefix List Configuration."
NEW QUESTION # 678
In BGP routing rules, routes with higher MED values are given priority.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 679
BFD determines whether a fault has occurred by periodically detecting packets. It is a fast fault detection mechanism that relies on routing protocols.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 680
Which of the following description about Link ID, Data, Type and Metirc in Router-L SA is correct? (Multiple choice)
- A. Metric describes the cost of this connection
- B. Data is used to describe the additional information of this connection, and the information referred to by different connection types is also different
- C. Type indicates the type of connection
- D. Link ID indicates the local identification of this connection, and the meaning of the same connection type Link ID is also different
Answer: A,B,C,D
NEW QUESTION # 681
The LSDB output of a router R2 is shown in the figure.
According to the analysis of the content in the figure, which of the following options is wrong?
- A. Area boundary route aggregation exists in Area1
- B. R2 is deployed in the backbone area, and R2 is an ABR
- C. There is no Stub area in the entire environment involved in the figure
- D. ASBR exists in Area 2, and the Router ID of ASBR is 6.6.6.6
Answer: D
NEW QUESTION # 682
In the MA network, after the DR and BDR election is completed, if the BDR fails, the DRother will re- elect a new BDR until the original BDR returns to normal.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 683
The goal of network management is to monitor, test, configure, analyze, evaluate and control network software and hardware to ensure normal network operation.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION # 684
When there are two ACs and multiple APs in the WLAN network, to configure the network in master- backup mode, half of the APs plan AC1 as the main AC and AC2 as the backup AC, and the other half of the APs plan AC2 as the main AC and AC1 as the backup AC. AC, thereby improving AC resource utilization.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION # 685
One of the features of OSPF is that it only supports MD5 authentication.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 686
There are two types of routing entries on a PIM network. (S, G) routing entries are used to set up on a PIM network and are applicable to both PIM-DM and PIM-SM networks.
Answer:
Explanation:
SPT
Explanation:
Routing Entries in PIM
(S, G) entries: Represent the shortest path tree (SPT) from a specific source (S) to a specific multicast group (G). These entries are created after data packets are transmitted directly from the source to the receivers.
(S, G) entries are used in both PIM-DM and PIM-SM modes.
PIM-DM and PIM-SM Modes
InPIM-DM, multicast traffic is initially flooded throughout the network and pruned where no receivers exist.
(S, G) entries represent source-specific paths created after the flooding stage.
InPIM-SM, multicast traffic initially flows through a shared tree, but (S, G) entries are created when the network switches to the SPT for more efficient forwarding.
HCIP-Datacom-Core Reference
The functionality and application of (S, G) routing entries are detailed in multicast and PIM configuration chapters.
NEW QUESTION # 687
The filter-policy 2000 export is configured in the IS-IS process server-group-AP, which statement about the function of this command is wrong?
- A. If this command is not configured, the device will advertise all the routes imported to S-IS by the external routing protocol by default.
- B. It needs to be used in combination with route import, so that only part of the imported external routes can be advertised to neighbors
- C. This command will filter the link state information published externally
- D. It will restrict the publishing of routing entries generated by the device itself
Answer: D
NEW QUESTION # 688
IGMP Snooping runs at the data link layer and is used to manage and control multicast groups, and solves the problem of multicast packets being broadcast on Layer 3.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 689
Four routers run IS-IS and have established adjacencies. The area IDs and router levels are marked in the following figure. Which of the following statements is true?
- A. The LSDB of R3 does not contain the LSP of R4.
- B. The LSDB of R2 does not contain the LSP of R4.
- C. The LSDB of R1 does not contain the LSP of R4.
- D. The LSDB of R2 does not contain the LSP of R3.
Answer: C
Explanation:
R1 is a Level-1 router in Area 49.0001, while R4 is in Area 49.0004. Level-1 routers only maintain LSDBs for their own area and do not contain LSPs from other areas, such as R4's LSP.
R2 is a Level-1-2 router, so it maintains LSDBs for both Area 49.0001 (Level-1) and Level-2 domains, which include LSPs from R4.
R3 and R4, as Level-2 routers, exchange LSPs with each other within the Level-2 domain.
Thus, the LSDB of R1 does not include R4's LSP .
NEW QUESTION # 690
iMaster NCE-Campus supports the management of Huawei network equipment through NETCONF and the management of third-party equipment through SNMP.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION # 691
Which of the following descriptions about the application of RPF in multicast data forwarding is incorrect?
- A. When the router receives a multicast message, it first checks the source address of the message, and then selects an optimal route based on the priority of the routing source. The outbound interface of this route is the RPF interface.
- B. If the RPF check fails, it indicates that the source path of the packet is wrong and the packet will be discarded.
- C. During the multicast data forwarding process, the multicast router will perform an RPF check on each received multicast data packet through the unicast routing table.
- D. The router will compare the incoming interface of the packet with the RPF interface of the RPF route.
If they are consistent, the RPF check passes, indicating that the source path of the packet is correct and it will be forwarded downstream.
Answer: C
NEW QUESTION # 692
In BGP, the community attribute is an optional transitional attribute, which is a routing label and is used to simplify the execution of routing policies.
It is divided into custom community attributes and public community attributes, so which of the following items belong to public community attributes? (Multiple choice)
- A. No_Export Subconfed
- B. No_Export
- C. No_Advertise
- D. Internet
Answer: A,B,C,D
NEW QUESTION # 693
On an IS-IS network, areas are divided by router, and a router can belong to only one area. Therefore, an IS-IS router only needs to maintain the LSDB of its area.
- A. TRUE
- B. FALSE
Answer: B
Explanation:
IS-IS Area Division:
IS-IS divides areas by routers, not by links. A router is assigned to a specific IS-IS area, but it can belong to multiple levels:
Level 1: Maintains the LSDB (Link State Database) for the local area only.
Level 2: Maintains the LSDB for the backbone area and exchanges routes between areas.
Behavior of a Level 1-2 Router:
A router configured as Level 1-2 must maintain two separate LSDBs:
One for intra-area routes (Level 1).
One for inter-area routes (Level 2).
Incorrect Statement:
The statement that an IS-IS router only needs to maintain the LSDB of its area is incorrect because Level 1-2 routers maintain LSDBs for both levels.
NEW QUESTION # 694
By default, VRP requires manual operation to resend update messages to the neighbor when the BGP command export routing policy (route-policy) is changed.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 695
When receiving a packet, a Huawei router matches the packet against ACL rules. The default ACL matching order used by the Huawei router is.
Answer:
Explanation:
Sequential
Explanation:
ACL Matching in Huawei Routers:
Access Control Lists (ACLs) are used to filter packets based on specific criteria, such as source/destination IP, ports, or protocols.
When a packet arrives, the Huawei router processes it against the configured ACL rules to decide whether to permit or deny the packet.
Reference: HCIP-Datacom-Core Technology Training Material (ACL Principles and Configuration).
Sequential Matching Order:
By default, Huawei routers match packets against ACL rules sequentially. This means:
The router checks the packet against rules in the order they are listed, starting from the top of the ACL.
The first rule that matches the packet's attributes is applied, and no further rules are checked. This is known as the first-match principle.
If no rules match, the packet is denied by default (implicit deny).
Reference: HCIP-Datacom Advanced Routing & Switching Technology (ACL Matching Mechanism).
Example of Sequential Matching:
Consider the following ACL rules:
Rule 10: Permit IP 192.168.1.0/24
Rule 20: Deny IP 192.168.1.1
If a packet with source IP 192.168.1.1 arrives:
The router matches it against Rule 10 (Permit 192.168.1.0/24) and allows the packet.
Rule 20 is not evaluated because the first match (Rule 10) already applies.
Alternative Matching Orders:
Some routers or configurations allow batch matching (evaluating all rules) for specific scenarios, but this is not the default behavior in Huawei routers.
Conclusion:
The default ACL matching order on Huawei routers is sequential, and the first matching rule determines the action applied to the packet.
NEW QUESTION # 696
In different scenarios, RSTP provides different protection functions.
Which of the following statement is wrong?
- A. The designated port with root protection enabled, when the port receives a better RSTBPDU, the port will enter the Discarding state and no longer forward packets. If the port does not receive a better RST BPDU for a period, it will automatically return to the normal Forwarding state
- B. After the BPDU protection function is enabled on the switching device, if the edge port receives RST BPDU, the edge port will be set as a non-edge port, and the spanning tree calculation will be performed again
- C. After the anti-TC-BPDU message attack function is enabled, the number of times the switching device processes TC BPDU messages within a unit time is configurable
- D. The designated port with the root protection function enabled, its port role can only remain as the designated port
Answer: B
NEW QUESTION # 697
......
H12-821_V1.0 certification guide Q&A from Training Expert ActualTorrent: https://www.actualtorrent.com/H12-821_V1.0-questions-answers.html
The Best HCIP-Datacom Study Guide for the H12-821_V1.0 Exam: https://drive.google.com/open?id=1GGQNE3_kAI-D-8B78AqHX8vDSzqa_AvS