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Huawei H12-821_V1.0 certification is highly valued in the IT industry, especially in the field of data communication. HCIP-Datacom-Core Technology V1.0 certification demonstrates that the candidate has a solid understanding of data communication core technologies and is capable of designing and implementing complex network solutions. HCIP-Datacom-Core Technology V1.0 certification is also recognized by many leading companies in the IT industry, making it a valuable asset for professionals seeking employment in this field.
Huawei H12-821_V1.0 (HCIP-Datacom-Core Technology V1.0) Certification Exam is a professional-level certification that validates the knowledge and skills of candidates in the area of Datacom-Core Technology. H12-821_V1.0 exam is designed to test the candidate's ability to configure and troubleshoot complex network infrastructures, as well as to understand advanced concepts related to network design and implementation. It is a highly sought-after certification for professionals who want to demonstrate their expertise in the field of Datacom-Core Technology.
NEW QUESTION # 199
An IP prefix list is a common matching tool used in routing policies. Which of the following cannot be configured as matching conditions in an IP prefix list on a Huawei router?
- A. Action
- B. Port number
- C. Mask
- D. Index
Answer: B
Explanation:
IP Prefix List Matching Conditions An IP prefix list matches based on:
Mask: Specifies the subnet mask length.
Action: Specifies whether to permit or deny.
Index: Orders the rules within the prefix list. Port numbers are not applicable as matching conditions in an IP prefix list.
NEW QUESTION # 200
On an OSPF network, if two routers with the same router ID run in different areas and one of the routers is an ASBR, LSA flapping occurs.
- A. FALSE
- B. TRUE
Answer: B
Explanation:
Understanding Router ID and Its Role in OSPF:
In OSPF, the Router ID uniquely identifies a router within the OSPF domain. If two routers are configured with the same Router ID, it can lead to issues such as LSA conflicts and flapping. This is because the Router ID is used as a key in OSPF operations, including LSA generation and database synchronization.
HCIP-Datacom-Core Technology Training Material (OSPF Basics - Router ID and LSA Handling).
Scenario Details:
Different Areas: Even if the two routers belong to different areas, the Router ID remains globally significant in the OSPF domain. This means that any duplication of Router IDs will confuse OSPF mechanisms.
ASBR (Autonomous System Boundary Router): When one of the routers is an ASBR, it generates Type 4 and Type 5 LSAs to describe external routes. These LSAs use the Router ID asan identifier. If another router in the network has the same Router ID, conflicts occur during LSDB synchronization.
Reference:HCIP-Datacom Advanced Routing & Switching Technology (LSA Types and ASBR Operations).
Impact of Router ID Duplication:
LSA Flapping: The OSPF process receives conflicting LSAs from routers with the same Router ID. This results in continuous updates and withdrawals of these LSAs, causing flapping.
Routing Instability: LSA flapping leads to frequent recalculations of the OSPF shortest path tree (SPT), affecting overall network stability.
Reference:HCIE-Datacom V1.0 Training Material (OSPF Troubleshooting and Best Practices).
Conclusion:
The statement isTRUE. LSA flapping occurs when two routers in an OSPF network have the same Router ID, even if they are in different areas and one is an ASBR. This is due to the global significance of Router IDs in OSPF and the role they play in LSA generation and propagation.
NEW QUESTION # 201
The four routers run IS-S and have established adjacency. The area numbers and router levels are marked in the figure.
Which of the following statements is correct?
- A. R2 and R3 learn default routes from each other, and a routing loop occurs in the network.
- B. Both R2 and R3 will generate LSPs of Level 1-2 with ATT set.
- C. R1 does not have the LSP generated by R4, so R1 can only communicate with R4 through the default route.
- D. Both R2 and R3 will generate Level-1 LSPs with ATT set.
Answer: D
NEW QUESTION # 202
For link state routing protocols, such as OSPF and IS-IS, using filter-policy to filter routes in the inbound direction can block the transmission of link state information, so that the filtered routes cannot be added to the local routing table.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION # 203
All routers in a network run IS-IS and are all in Area 49.0001. The LSDB of R1 is as shown in the figure. Based on this, the Level of the four routers can be determined.
Answer:
Explanation:
NEW QUESTION # 204
R1 contains the configuration shown in the figure.
Isis 1
Cost-style wide
Network-entity 49.0022.ee8c.a0c2.baf2.00
Which option is correct for the following description of IS-IS process 1?
- A. The device type of R1 is Level-2
- B. The device type of R1 cannot be determined
- C. The device type of R1 is Level-1-2
- D. The device type of R1 is Level-1
Answer: C
NEW QUESTION # 205
By default, the sending interval of BFD packets is ______ milliseconds, the receiving interval is ______ milliseconds, and the local detection is ______ times.
Answer:
Explanation:
1000|1000|3
NEW QUESTION # 206
Which of the following descriptions of router classification in IS-IS is incorrect?
- A. The Level-2 LSDB only contains routing information for the area where the Level-2 router is located.
- B. Level-1 routers can establish adjacency relationships with Level-1-2 routers.
- C. Level-1 router cannot establish adjacency relationship with Level-2 router
- D. When configuring IS-IS on a Huawei router, by default, the global Level1 of the router is Level-1-2.
Answer: A
NEW QUESTION # 207
Please pair the following VRRP events with the switching between state machines by sequence number.
Answer:
Explanation:
NEW QUESTION # 208
Please match the following BGP-recognized community attribute names with their corresponding functions.
Answer:
Explanation:
NEW QUESTION # 209
Multicast applies to any point-to-multipoint data transmission. Which of the following types of application data can be forwarded in multicast mode?
- A. Real-time audio conferencing
- B. Livestreaming
- C. Data warehouse
- D. Network TV
Answer: A,B,D
Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
1. Multicast Applications:
Multicast is ideal for applications where data is sent from one source to multiple receivers, such as:
Real-Time Audio Conferencing:Multicast delivers audio streams to participants without duplicating the same data for each receiver.
Livestreaming:Streaming live events to viewers using multicast minimizes bandwidth usage by delivering a single stream to multiple users.
Network TV:Multicast is used in IPTV to broadcast TV channels efficiently.
2. Why Data Warehouse is Incorrect:
Data warehousedoes not involve point-to-multipoint transmission. Data warehouse activities (e.g., analytics or database queries) typically use unicast connections for communication between the server and the client.
3. Summary:
The correct options areA, B, C, as they all involve point-to-multipoint communication supported by multicast.
Reference:
Huawei HCIA-Datacom Study Guide, Chapter "Multicast Applications."
NEW QUESTION # 210
In BGP, the AS_Path attribute records the numbers of all ASs that a route passes through from the local end to the destination in the vector order.
Which of the following statements is false about the attribute change during route transmission?
- A. When advertising the route to an EBGP peer, the BGP speaker creates an AS_Path carrying the local AS number in the Update message.
- B. When advertising the route to an IBGP peer, the BGP speaker creates an empty AS_Path in the Update message.
- C. When advertising the route to an IBGP peer, the BGP speaker does not change the AS_Path attribute of the route.
- D. When advertising the route to an EBGP peer, the BGP speaker adds the local AS number to the end of the AS_Path.
Answer: B
Explanation:
OptionA is false. When advertising a route to an IBGP peer, theBGP speaker does not modifythe AS_Path. It simply advertises the routeas-is, preserving the AS_Path learned from EBGP.
Clarification of the options:
Bis correct: When a route is sent to an EBGP peer, the local AS is prepended to the AS_Path.
Cis correct: The AS_Path begins with the local AS when a new route is advertised to an EBGP neighbor.
Dis correct: IBGP doesnotmodify AS_Path when passing routes within the same AS.
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
"BGP speakers prepend their AS number to the AS_Path only when advertising to EBGP peers. IBGP peers do not alter the AS_Path." (Chapter: BGP Path Attributes - Section: AS_Path)
NEW QUESTION # 211
An enterprise administrator configures route summarization on ASBRs to reduce the number of inter-area Type 3 LSAs, which in turn reduces the routing table size and improves device resource utilization.
- A. FALSE
- B. TRUE
Answer: B
Explanation:
OSPF Route Summarization:
Route summarization combines multiple specific routes into a single summary route. This reduces the number of LSAs advertised between OSPF areas, especially Type 3 LSAs.
Benefits of Route Summarization:
Reduces the size of the OSPF database and routing table.
Minimizes the processing overhead on routers by decreasing the number of routing entries.
Improves the scalability of the OSPF network.
ASBR Function:
The ASBR advertises external routes into OSPF and can summarize routes at area boundaries or during redistribution.
NEW QUESTION # 212
When multiple access channels are set for the same access requirement, the insecure access channels are not used and secure access channels are selected in normal cases.
Which of the following are secure access channels?
- A. HTTPS
- B. Telnet
- C. SNMPv2
- D. SFTP
Answer: A,D
Explanation:
Secure access channels include protocols that encrypt the transmitted data to protect against interception or unauthorized access. HTTPS (HyperText Transfer Protocol Secure) ensures data encryption over web communications, while SFTP (Secure File Transfer Protocol) provides secure file transfer by utilizing SSH for data encryption. Telnet and SNMPv2, on the other hand, lack robust encryption and are considered insecure. Huawei security standards highlight the importance of encrypted communication to prevent data leaks.
NEW QUESTION # 213
In IS-IS, setting which of the following flags means that although the LSP will still spread in the network, the LSP will not be used when calculating the route through the overloaded router?
- A. OL
- B. ATT
- C. Checksum
- D. P
Answer: A
NEW QUESTION # 214
In the SNMP management model, which of the following elements defines the attributes of a managed device?
- A. NMS
- B. Agent
- C. Managed Object
- D. MIB
Answer: D
Explanation:
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 .
NEW QUESTION # 215
Which of the following statements about the forwarding plane of switching equipment is incorrect?
- A. Provide high-speed non-blocking data channel
- B. Statistics of messages can be realized
- C. Composed of main control board and interface board
- D. Realize packet encapsulation and decapsulation
Answer: C
NEW QUESTION # 216
An enterprise uses OSPF to implement network communication. To ensure data validity and security, all authentication modes supported by OSPF are enabled on routers. In this case, interface authentication is preferentially used by the routers.
- A. FALSE
- B. TRUE
Answer: B
Explanation:
OSPF Authentication OverviewOSPF supports three authentication modes:
* Null Authentication: No authentication (default).
* Plaintext Authentication: Uses clear-text passwords.
* MD5 Authentication: Secure cryptographic authentication.
Interface-Level PriorityWhen both interface-level and area-level authentication are configured, OSPF prioritizes interface-level authentication. This ensures that interface-specific security overrides area-wide configurations for greater granularity and security.
HCIP-Datacom-Core Reference
* OSPF authentication hierarchy and configurations are detailed in the OSPF security configuration chapter.
NEW QUESTION # 217
Which of the following descriptions of the application of route reflectors in BGP are correct? (Multiple choice)
- A. The routes learned by the RR from the client are only published to all non-clients of this RR.
- B. When the RR receives the route from the peer, it only selects the best route for reflection.
- C. RR publishes the routes learned from EBGP peers to all non-clients and clients.
- D. The routes learned by the RR from non-client IBGP peers are published to all clients of this RR.
Answer: B,C,D
NEW QUESTION # 218
Routers R1 and R2 are directly connected through GigabitEthernet0/0/0 respectively, and try to establish an OSFP neighbor relationship, but the neighbor relationship has not been successfully established. The troubleshooting process is shown in the figure.
So which of the following operations can make R1 and R2 neighbor management established normally?
- A. [R2] interface GigabitEthernet 0/0/0
[R2-GigabitEtherneto/0/0] undo ospf timer hello - B. [R2] ospf 1 [R2-0spf-1] ara0
[R2-ospf-1-area-0.0.0.0] timer hello 10 - C. [Relintertace GigabitEthernet 0/0/0
[R2-GigabitErhernet0/0/0] ospf timer hello 20 - D. [R2] ospf 1 [R2-ospf-1] area0
[R2-ospf=1-area-00.0.0lundotimer hello
Answer: C
NEW QUESTION # 219
SSH uses asymmetric addition AES and DES to achieve data transmission security, and uses HMAC to ensure complete integrity verification of data.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION # 220
Which of the following statements about OSPF protocol packets is wrong?
- A. OSPF packets are encapsulated in UDP packets, and the port number is 89
- B. All OSPF packet headers carry the Router-ID field
- C. The header format of all OSPF packets is the same
- D. The OSPF protocol uses five types of packets to complete the transfer of routing information
Answer: A
NEW QUESTION # 221
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