2026 Realistic Verified Free Huawei H12-821_V1.0 Exam Questions
H12-821_V1.0 Real Exam Questions and Answers FREE
Acquiring the Huawei H12-821_V1.0 (HCIP-Datacom-Core Technology V1.0) Certification is a significant achievement for professionals looking to advance their careers in data communication technology. HCIP-Datacom-Core Technology V1.0 certification validates the candidate's proficiency in the core technologies used in data communication and provides them with the skills and knowledge needed to succeed in their job roles. HCIP-Datacom-Core Technology V1.0 certification is recognized globally and is highly valued by organizations that require professionals with advanced data communication skills.
Huawei H12-821_V1.0 certification is highly valued in the IT industry, and candidates who pass the exam can enjoy numerous career benefits. HCIP-Datacom-Core Technology V1.0 certification can help candidates to advance their careers in network engineering, network administration, and other IT-related fields. It can also increase the chances of getting hired by top IT companies and organizations.
Huawei H12-821_V1.0 exam is a three-hour test that consists of 60 multiple-choice questions. H12-821_V1.0 exam is administered by Huawei and can be taken at any of the authorized Huawei testing centers worldwide. H12-821_V1.0 exam is available in both English and simplified Chinese languages. The passing score for the exam is 600 out of 1000, and the result is valid for three years.
NEW QUESTION # 209
Which of the following descriptions of 802.1X authentication technology in VLAN networks is incorrect?
- A. It is a port-based three-layer network access control protocol
- B. Adopt a typical C/S architecture
- C. Usually use RADIUS server as authentication server
- D. The client must support EAPoL on the LAN
Answer: A
NEW QUESTION # 210
When the MTU of the interconnection interface of two routers in the broadcast network does not match, and the interface is configured with ospf mtu-enablet, which of the description of the state change of the neighbor relationship between the two routers is correct?
- A. The neighbor relationship between the two devices can enter Full
- B. The neighbor relationship status of the two devices stays in the Init state
- C. The neighbor relationship status of the two devices stays at 2-way
- D. The neighbor relationship between the two devices stays at Exstart
Answer: D
NEW QUESTION # 211
The neighbor information of the router RTA is as shown in the figure.
Which of the following descriptions of the OSPF neighbor information is wrong?
- A. The Router ID of this router is 1.1.1.1
- B. The address of DR is 10.1.1.1
- C. The neighbor's Router ID is 2.2.2.2
- D. The router is the Master
Answer: D
NEW QUESTION # 212
Which of the following attacks is not the network layer attack?
- A. Smurf attack
- B. IP spoofing attack
- C. ARP spoofing attack
- D. ICMP attack
Answer: C
Explanation:
ARP spoofing is a Layer 2 attack, as it targets ARP tables in switches or end devices. All other attacks, including IP spoofing, ICMP attacks, and Smurf attacks, are network layer (Layer 3) attacks .
NEW QUESTION # 213
When OSPF is in the ExStart state, routers and neighbors send DD messages containing link status information digests to each other.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION # 214
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. SFTP
- B. Telnet
- C. HTTPS
- D. SNMPv2
Answer: A,C
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 # 215
What types of metrics does the IS-IS protocol support? (Multiple choice)
- A. default
- B. wide
- C. Narrow
- D. Tos
Answer: B,C
NEW QUESTION # 216
Which of the following description about the reliable routing update of BGP is correct?
- A. BGP works on top of UDP, and the transport layer protocol is 179
- B. BGP sends complete routing table information for each routing update
- C. BGP uses multicast update
- D. BGP does not need to periodically advertise routing information
Answer: D
NEW QUESTION # 217
See the following figure. All routers on the network run IS-IS and are in area 49.0001. By referring to the LSDB of R1, the Level-2 DIS is. (Enter the device name, for example, R1.)
Answer:
Explanation:
R3
* Understanding the LSDB and Level-2 DIS Election in IS-IS:
* In IS-IS, the Designated Intermediate System (DIS) is elected for both Level-1 and Level-2 on broadcast networks to manage the link-state database (LSDB) and reduce the number of LSAs exchanged.
* The election of the DIS is based on the highest priority. If the priority is the same, the router with the highest System ID becomes the DIS.
NEW QUESTION # 218
The traffic limiting policy feature only supports the number of connections initiated by the specified IP or the number of connections received.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION # 219
Which of the following community attributes enables a device to send a received route with this attribute toany BGP peer?
- A. No_Advertise
- B. No_Export_Subconfed
- C. Internet
- D. No_Export
Answer: C
Explanation:
Internet- Thiscommunity attribute allows a route to be advertised to any BGP peer, including EBGP and IBGP. This is the default behavior if no other restrictive community is attached.
No_Advertise- Prevents the route from being advertised toanypeer.
No_Export- Prevents the route from being advertised toEBGP peers.
No_Export_Subconfed- Restricts the route from being advertisedoutside the sub-ASin a confederation.
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
"The Internet community attribute allows unrestricted advertisement of a route. Other community attributes like No_Advertise and No_Export limit route propagation." (Chapter: BGP Community Attributes - Section: Well-known Communities)
NEW QUESTION # 220
Please pair the following functions with the basic concepts in the VRRP protocol.
Answer:
Explanation:
NEW QUESTION # 221
When running OSPFv3 on a Huawei router, the OSPFv3 process will automatically select an interface address as the Router ID of the process.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION # 222
BFD itself does not have a neighbor discovery mechanism, but relies on the upper-layer application being served to notify its neighbor information to establish a session.
- A. TRUE
- B. FALSE
Answer: A
NEW QUESTION # 223
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 discarding or learning state does not learn MAC addresses
- B. The port In discarding or learning state does not forward data frames.
- C. The port in discarding state does not learn MAC addresses table.
- D. The port In learning stole docs not learn MAC addresses table.
Answer: B,C
Explanation:
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 .
NEW QUESTION # 224
Which of the following functions does iMaster NCE support? (Multiple choice)
- A. Management functions
- B. Control function
- C. Analysis function
- D. Forwarding function
Answer: A,B,C
NEW QUESTION # 225
During routine O&M, an engineer finds that theHold Timeparameters of two devices are inconsistent. In this case, which of the following situations occurs?
- A. A peer relationship can be established, and the smaller Hold Time is selected after negotiation.
- B. A peer relationship can be established, and the larger Hold Time is selected after negotiation.
- C. A peer relationship can be established, and the devices use their own parameter values to send messages.
- D. No peer relationship can be established.
Answer: A
Explanation:
In BGP and other TCP-based protocols like OSPF and IS-IS, when devices havedifferent Hold Times, thesmaller value is chosenafter negotiation. This ensuresfaster detectionof communication loss.
The Keepalive and Hold Timers are negotiated during the establishment of a BGP session.
The smaller Hold Timeis used to maintain symmetry and prevent timeouts.
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
"When negotiating Hold Time, both ends agree to use the smaller of the two values. This value is used to detect failures faster." (Chapter: BGP Fundamentals - Section: BGP Session Establishment)
NEW QUESTION # 226
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