Master 2026 Latest The Questions HCIP-Datacom and Pass H12-831_V1.0-ENU Real Exam!
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Huawei H12-831_V1.0 Exam is designed to test the knowledge and skills of individuals who are seeking to become certified professionals in the field of advanced routing and switching technologies. HCIP-Datacom-Advanced Routing & Switching Technology V1.0 certification exam is intended for individuals who already possess a strong foundation in routing and switching technologies and are looking to further enhance their skills and knowledge. The HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Exam is a rigorous exam that requires candidates to possess a deep understanding of complex routing and switching technologies.
NEW QUESTION # 42
On the network shown in the figure, IS-IS runs on Rl, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. In AS 65000, Ri, R3, R4, and R6 each establish IBGP peer relationships with R2 and R5. R2 and R5 are RRs, and Rl, R4, R3, and R6 are clients. The IBGP peer relationships are established using LoopbackO. The IP address of LoopbackO on each router is 10.0.X.X/32, and the router ID is 10.0.X.X, where X is the number of the router. Rl and R4 import the external route 192.168.1.0/24 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0/24 to BGP through the import-route command. Which of the following statements are true?
- A. For 192.168.1.0/24, R3 preferentially selects the BGP route received from R2.
- B. For 192.168.1.0/24, R6 preferentially selects the BGP route received from R2.
- C. For 192.168.2.0/24, R2 preferentially selects the BGP route received from R3.
- D. For 192.168.2.0/24, R5 preferentially selects the BGP route received from R3.
Answer: A,B,C,D
NEW QUESTION # 43
In the BFD (Bidirectional Forwarding Detection) mechanism, two systems establish a BFD session and periodically send BFD control packets along the path between them. If one system does not receive BFD control packets within a specified period, the path is considered faulty.
Which of the following is NOT a possible cause of the BFD session down event?
Options:
- A. The BFD session names configured in the two systems are different.
- B. Packets with UDP destination port 4784 are denied.
- C. The outbound interface bound to the single-hop BFD session is physically faulty.
- D. The remote and local discriminators of the BFD session do not match.
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
* BFD (Bidirectional Forwarding Detection) is a high-speed failure detection mechanism that monitors link availability between two routers.
* A BFD session can go down due to several reasons, including:# UDP Port 4784 blocked: BFD control packets are encapsulated in UDP with destination port 4784, so blocking this port prevents BFD communication (option A is a valid cause).# Physical interface failure: If the outbound interface for a single-hop BFD session fails, BFD will go down (option B is a valid cause).# Mismatched discriminators: BFD sessions use local and remote discriminators to uniquely identify sessions; if these do not match, the session cannot be established (option C is a valid cause).
* Incorrect BFD session names do NOT cause the session to go down, because BFD sessions are identified by discriminator values, not names. (Option D is incorrect and is the correct answer to this question.)
# Reference: HCIP-Datacom Advanced Routing & Switching Technology - BFD Mechanism & Troubleshooting
NEW QUESTION # 44
OSPFv2 is an IGP running on an IPv4 network; OSPFv3 is an IGP running on an IPv6 network. The basic working mechanism of OSPFv3 is the same as OSPFv2, such as the election of DR and BDR. As shown in the figure, an engineer uses three routers to test IPv6 services. He wants to realize the interconnection and interoperability of IPv6 networks by running OSPFv3.
Which of the following statements regarding the election of DR on this network is correct?
- A. After the network converges, a new device R4 is added to the broadcast link, and the priority of R4 is 150. When the network converges again, R4 is the DR
- B. After the network converges, R1 is the DR
- C. After the network converges, R1 is powered off and restarted. When the network converges again, R3 is the DR
- D. After the network converges, the engineer changes the priority of R1 to 100, the priority of R2 to 10, and the default value of R3. When the network converges again, R1 is DR and R2 is BDR
Answer: C
NEW QUESTION # 45
When troubleshooting a network, if you need to confirm the business traffic path, which of the following tasks may be required? (Multiple choice)
- A. Confirm the data link layer service traffic path
- B. Investigate business traffic path planning in the network design stage
- C. Confirm the network layer business traffic path
Answer: A,C
NEW QUESTION # 46
BFDLink state detection at the heart (millisecond) level can be achieved.
- A. right
- B. wrong
Answer: A
NEW QUESTION # 47
What is the default aging time of the MA, C address table of Huawei switches?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION # 48
The ipv6 enable topology standard is configured in IS-IS protocol view. The meaning of this command is that Pv4 and IPv6 share the same topology.
- A. TRUE
- B. FALSE
Answer: A
NEW QUESTION # 49
After configuring the VLAN-based MAC address drift detection function, if the MAC address drifts, you can configure the actions of the interface according to your needs.
Which of the following is not a configurable action?
- A. Flow filtering
- B. Send alert
- C. MAC address blocking
- D. Interface blocking
Answer: A
NEW QUESTION # 50
What is the purpose of configuring LSP fragmentation on an IS-IS device?
- A. no real purpose
- B. make the device unable to learnIS-ISrouting information
- C. enable the device to support moreIS-ISrouting entry
- D. make the device unbuildableIS-ISNeighbor
Answer: C
NEW QUESTION # 51
On the ISIS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. In this case, R3 can learn this default route through IS-IS.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 52
In an MPLS network, functions such as neighbor discovery, session establishment and maintenance, and label management are implemented by exchanging LDP messages between SRs running the DP protocol. To ensure the reliability of message delivery, all LDP messages are sent and received based on TCP connections.
- A. True
- B. False
Answer: B
NEW QUESTION # 53
Configuring DHCP Snooping can be used to prevent imitators from attacking. Which of the following steps should be included in the configuration process? (Multiple choice)
- A. Enable the global DHCP Snooping function
- B. Configure interface trust status
- C. Enable DHCP Snooping on the interface or VLAN
- D. Enable global DHCP function
Answer: A,B,C,D
NEW QUESTION # 54
On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces. The AS number is 6500X, where X is the number of the router. Both Rl and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import-route command. By default, in the routing table of R3, which of the following is the AS_Path attribute carried in the route to 192.168.1.0/24?
- A. 65006, 65005, 65004
- B. 65002, 65001
- C. 65002, 65005, 65004
- D. 65006, 65005, 65004, 65001
Answer: A
NEW QUESTION # 55
When there are multiple redundant links in the IS-S network, multiple equal-cost routes may appear.
Regarding equal-cost routes in an IS-IS network, which of the following descriptions is wrong?
- A. For each route in the equal-cost route, the priority can be specified, and the route with the higher priority will be preferred. The rest are used as backup routes
- B. When the number of equal-cost routes in the networking is greater than the number configured through commands, and the priorities of these routes are the same, the route with the higher System ID of the next hop device is preferred for load sharing
- C. After the equal-cost routing priority is configured, when the IS-IS device forwards the traffic that reaches the destination network segment, it will not adopt the load sharing method, but will forward the traffic to the next-hop with the highest priority.
- D. If negative arbitration sharing is configured, the traffic will be evenly distributed to each link
Answer: C
NEW QUESTION # 56
According to this picture, we can judge that R4 is on?
- A. 2 default routes with different costs
- B. 2 equal-cost default routes
- C. 1 default route
- D. 4 equivalent default routes
Answer: B
NEW QUESTION # 57
On the OSPF network shown in the figure, R1 and R2 use OSPF to communicate with each other through Loopback0. In addition:
* MPLS LDP is enabled on R1 and R2.
* The LDP transport address is the IP address of Loopback0.
* A network engineer finds that an LDP session cannot be established between R1 and R2 and runs diagnostic commands (shown in the figure) to locate the fault.
Given this, which of the following are possible causes of the fault?
Options:
- A. R1's GE0/0/1 rejects packets with UDP destination port 646.
- B. MPLS LDP is not enabled on R2's GE0/0/1.
- C. R1's GE0/0/1 rejects packets with the destination IP address 10.0.2.2.
- D. R2's GE0/0/1 rejects packets with TCP destination port 646.
Answer: B,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding MPLS LDP (Label Distribution Protocol)
* LDP (Label Distribution Protocol) runs over TCP port 646.
* LDP uses the transport address (Loopback0 in this case) to establish TCP sessions between neighbors.
* For an LDP session to be established, both routers must:
* Enable LDP on the interface (GE0/0/1).
* Allow TCP traffic on port 646 (used for LDP adjacency formation).
2. Analyzing the Issue and Possible Causes
* The figure shows a successful ping from R2 to R1's Loopback0 (10.0.1.1/32).
* This means basic IP connectivity between R1 and R2 is working.
* OSPF is properly advertising Loopback0 addresses between the routers.
* The problem must be related to LDP itself, not general IP reachability.
3. Evaluating Each Answer Option
* Option A: "R1's GE0/0/1 rejects packets with the destination IP address 10.0.2.2."
* Incorrect.
* The ping test in the figure shows successful replies from 10.0.1.1 to 10.0.2.2, meaning packets to 10.0.2.2 are not being rejected.
* This is NOT the cause of the LDP failure.
* Option B: "MPLS LDP is not enabled on R2's GE0/0/1."
* Correct.
* If LDP is not enabled on R2's GE0/0/1, then R1 and R2 cannot form an LDP session.
* MPLS LDP must be enabled on both interfaces for label exchange.
* This is a valid cause of the issue.
* Option C: "R2's GE0/0/1 rejects packets with TCP destination port 646."
* Correct.
* LDP operates over TCP port 646, so if R2's GE0/0/1 has a firewall or ACL blocking TCP port 646, then LDP will fail.
* Blocking TCP 646 on R2's interface would prevent the session from establishing.
* This is another valid cause of the issue.
* Option D: "R1's GE0/0/1 rejects packets with UDP destination port 646."
* Incorrect.
* LDP does not use UDP; it uses TCP port 646.
* This is not a valid cause of the issue.
Final Answer:
# B and C are correct.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* MPLS LDP Session Establishment and TCP 646 Dependency
* How OSPF Advertises Loopback0 for LDP Transport
* Common LDP Debugging Techniques and ACL Issues
NEW QUESTION # 58
In the same environment, engineers A and B execute the tracert command. The destination addresses are the same, but the paths are different. What are the possible reasons?
- A. Engineer B's operation error
- B. Engineer A's operation error
- C. The phenomenon is abnormal, the device has an operating system failure
- D. The destination port numbers of the UDR packets serving tracert are different, and the hashes reach different equivalent next hops.
Answer: D
NEW QUESTION # 59
The rollback operation of the project cutover can be determined temporarily according to the situation during the cutover, and no advance planning is required.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 60
To prevent hackers from attacking user devices or networks through MA, C addresses, you can configure the MA, C addresses of untrusted users as black hole MA, C addresses to filter out illegal MA, C addresses.
- A. False
- B. True
Answer: B
NEW QUESTION # 61
According to this picture, you can judge
- A. R1 with 3000:FDEA::3 is IB6P neighbor
- B. R1 has a TCP connection with 3000:FDEA::3
- C. R1 learned route 3002 through IBGP::3/128
- D. The optimal outgoing interface for R1 to access room 3000: FDEA::3 is GigabitEtherneto/0/1
Answer: A,C
NEW QUESTION # 62
During the process of viewing the debug output through the SSH terminal, a lot of information pops up. Which of the following operations can make the Monitor terminal no longer pop up the debug message? (Multiple choice)
- A. Open the notepad, enter undo terminal debugging, copy the command line, and paste it into the Monitor interface
- B. Open the notepad, enter undo debugging all, copy the command line, and paste it into the Monitor interface
- C. Exit the current Monitor interface, log in to the device again using SSH to open a new Monitor interface
- D. Open the notepad, enter undo terminal monitor, copy the command line, and paste it into the monitor interface
Answer: A,B
NEW QUESTION # 63
In OSPF, the A, BR will convert all type 7 L SAs in the NSSA area to type 5 L SAs.
- A. True
- B. False
Answer: B
NEW QUESTION # 64
What is the most efficient way to view device alarms through the CLI?
- A. display clock
- B. display alarm
- C. display interface brief
- D. display current-configuration
Answer: B
NEW QUESTION # 65
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