100% Accurate Answers! Jan-2026 H12-831_V1.0-ENU Actual Real Exam Questions
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Huawei H12-831_V1.0 certification exam is a computer-based exam that consists of 60 multiple-choice questions. H12-831_V1.0-ENU exam is administered by Pearson VUE, a leading provider of computer-based testing services. Candidates have 90 minutes to complete the exam and must achieve a passing score of at least 60% to receive the certification.
NEW QUESTION # 58
On the network shown in the figure, the network administrator deploys DHCP snooping on the switch to defend against bogus DHCP server attacks.
Which of the following interfaces should be configured as the DHCP trusted interface?
- A. GE0/0/4
- B. GE0/0/3
- C. GE0/0/2
- D. GE0/0/1
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding DHCP Snooping and Trusted/Untrusted Ports
1. What is DHCP Snooping?
* DHCP Snooping is a security feature that prevents rogue DHCP servers from providing unauthorized IP configurations to clients.
* It categorizes switch ports into:
* Trusted Ports: Allow DHCP Offer and ACK messages from a legitimate DHCP server.
* Untrusted Ports: Block unauthorized DHCP responses to prevent rogue DHCP attacks.
Analyzing the Network Setup in the Figure
Interface
Connected Device
DHCP Role
Should it be Trusted?
GE0/0/1
PC1 (DHCP Client)
Requests DHCP leases
# Untrusted
GE0/0/2
DHCP Server (Legitimate)
Provides DHCP leases
# Trusted
GE0/0/3
Web Server
Not involved in DHCP
# Untrusted
GE0/0/4
Bogus (Rogue) DHCP Server
Malicious DHCP Server
# Untrusted & Blocked
* GE0/0/2 is connected to the legitimate DHCP server, meaning it should be marked as a TRUSTED interface.
* GE0/0/4 connects to a bogus DHCP server, which must be UNTRUSTED to block unauthorized DHCP responses.
* GE0/0/1 (Client) and GE0/0/3 (Web Server) do not need to be trusted.
# Thus, the correct answer is: D. GE0/0/2.
Final Conclusion:
# GE0/0/2 should be configured as the trusted DHCP interface.# GE0/0/1 (Client) should remain untrusted.# GE0/0/3 (Web Server) does not need DHCP trust.# GE0/0/4 (Bogus DHCP Server) should be blocked.
Thus, the correct answer is: D. GE0/0/2.
NEW QUESTION # 59
In the network shown in the figure below, to implement a remote LDP session between SWA and SWC. the following The law is correct
- A. You need to create a remote peer, and then specify the peer'slsr-id
- B. The configuration in the figure can already be realized
- C. No need to specify the correct equivalentlsr-id
- D. Need to be equipped with a direct connection port to establishTCPconnect
Answer: A
NEW QUESTION # 60
Which of the following reasons may cause the hosts in the same VLAN of the LAN to fail to communicate with each other?
- A. Port isolation is configured on the switch
- B. interface is artificialshutdownor the physical interface is damaged
- C. switchMA, Caddress learning errors
- D. The wrong port is configured on the switch andMA, Caddress binding
Answer: A,B,C,D
NEW QUESTION # 61
Which of the following features affects BGP neighbor establishment?
- A. ebgp max hop
- B. BGPCertification
- C. BGP GSTM
- D. BGProute filtering
Answer: A,B,C
NEW QUESTION # 62
On a BGP/MPLS IP VPN network, VPNv4 routes carry the export RT. Which of the following attributes is used by MP-BGP to carry the export RT?
- A. AS Path
- B. Extended_Community
MP_REACH_NLRI - C. Local_Preference
Answer: B
NEW QUESTION # 63
In the network shown in the figure below, to implement a remote LDP session between SWA and SWC. the following The law is correct
- A. You need to create a remote peer, and then specify the peer'slsr-id
- B. The configuration in the figure can already be realized
- C. No need to specify the correct equivalentlsr-id
- D. Need to be equipped with a direct connection port to establishTCPconnect
Answer: A
NEW QUESTION # 64
OSPF requires that routers in the same area have the same link state database (LSDB). As the number of routes on the network increases, some routers cannot carry so much routing information due to limited system resources. This state is called database overflow. If the Isdb-overflow-limit number 7 command is run on all routers on an OSPF network, which of the following conditions are likely to cause routers to enter the overflow state?
- A. The number of Type 5 LSAs exceeds 7.
- B. The number of Type 7 LSAs exceeds 7.
- C. The number of Type 3 LSAs exceeds 7.
- D. The number of Type 4 LSAs exceeds 7.
Answer: A
NEW QUESTION # 65
According to this picture, Xinmen can be judged?
- A. R1access172.16.1.4have4an equivalent path
- B. R1access172.16.1.4have2an equivalent path
- C. R1access172.16.1.4.need to go through2hop router
- D. R1access172.16.1.4,need to go through4hop router
Answer: B,C
NEW QUESTION # 66
What is the default aging time of the MAC address table of Huawei switches in seconds?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION # 67
Regarding multi-instance CE (Mlulti-VPN-Instance CE, MCE), which of the following description is wrong?
- A. Devices with MCE function can access multiple VPN instances in BGPIMPLS IP VPN applications, reducing user investment in network equipment
- B. Users connected to the same MCE but not belonging to a VPN instance cannot access each other
- C. On the MCE device, you need to create separate routing and forwarding tables for different VPNs, and bind them to the correct interface
- D. There must be multiple physical links between MCE and PE to achieve isolation between different VPIN instances
Answer: D
NEW QUESTION # 68
About the site in the BGPIMPLS IP VPN network architecture. Which of the following descriptions is correct?
- A. The two geographically separated networks must belong to different sites
- B. site is a groupIPsystem, a network of hosts cannot be called a site
- C. in any case, belong to the sameVPNDifferent sites on the
- D. through the sameCETerminals connected to the operator's network may belong to different sites(MCE)
Answer: D
NEW QUESTION # 69
After the VLAN-based MA, C address flapping detection function is configured, if the MA, C address flaps. The interface can be configured to perform actions according to requirements. Which of the following is NOT a configurable action?
- A. Traffic filtering
- B. MA, Caddress blocking
- C. interface blocking
- D. send alert
Answer: A
NEW QUESTION # 70
A campus has deployed IPv6 for service testing. There are 4 routers in the network, running 0SPFV3.
Interconnection of IPv6 networks. As shown in the figure, an engineer checked the LSDB of R2 and intercepted one of them Link-LSAs. Which of the following statements is true about the description of this LSA?
- A. R2interfaceGE0/0/0IPV6address prefix:2001:2343:23: :/64
- B. produce theLSAThe router isR2
- C. ShouldLSAshowR2External routing is not supported, but participatingIPv6route calculation
- D. R2interfaceGEO/O/OThe link-local address force:FE80::2E0;FCFF:FEC, D:4F79
Answer: A,B,D
NEW QUESTION # 71
In addition to virtual connections, what type of IPv6 address is the source IPv6 address of OSPFv3's Hello text?
- A. unique local address
- B. IPv6anycast address
- C. Global Unicast Address
- D. link-local address
Answer: D
NEW QUESTION # 72
Which of the following statements about the OSPFV3 packet format is correct?
- A. HellotelegramoptionNo changes to the field
- B. HelloPackets no longer carry address informationInterface ID
- C. removedAuthentication,AuthTypefield
- D. OSPFversion number from2became3
Answer: B,C,D
NEW QUESTION # 73
On an enterprise network shown in the figure, EBGP is deployed between CEs and PEs.
CE1 sends a VPN route to PE1.
Which of the following statements are false?
Options:
- A. If the command peer 10.1.3.1 substitute-as is run on PE2, CE3 accepts the route.
- B. If no additional action is taken, CE3 discards the route.
- C. To enable CE3 to receive the route, run the command peer 10.1.1.1 soo 200:1 on PE1.
- D. If the commands peer 10.1.1.1 soo 200:1 and peer 10.1.2.1 soo 200:1 are run on PE1, CE2 accepts the route.
Answer: C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding Site of Origin (SoO) in MPLS VPNs
* SoO (Site of Origin) is used in MPLS VPNs to prevent loops in multi-homed CE scenarios.
* Routes with the same SoO value are not advertised back to the same site.
2. Analysis of Each Answer Choice
A: "To enable CE3 to receive the route, run the command peer 10.1.1.1 soo 200:1 on PE1." (# False)
* SoO is used to prevent loops by tagging routes that belong to the same site.
* Applying SoO (200:1) on PE1 for CE1 means that any other PE (such as PE2) receiving the route will not advertise it back to the same site (CE1).
* This statement is false because applying SoO here does not directly enable CE3 to receive the route. Instead, CE3 must accept routes with SoO values properly configured.
B: "If the commands peer 10.1.1.1 soo 200:1 and peer 10.1.2.1 soo 200:1 are run on PE1, CE2 accepts the route." (# False)
* SoO ensures that a route received from one CE is not sent back to another CE in the same site.
* If SoO (200:1) is assigned to CE1 and CE2, routes will be blocked because they share the same SoO tag.
* Thus, CE2 will not accept the route, making this statement false.
C: "If the command peer 10.1.3.1 substitute-as is run on PE2, CE3 accepts the route." (# True)
* substitute-as allows a router to replace the received AS number in the AS_PATH with another AS number, ensuring that routes are accepted even when AS_PATH filtering is in place.
* This prevents CE3 from rejecting the route due to AS-Path loop prevention.
* # Thus, this statement is true.
D: "If no additional action is taken, CE3 discards the route." (# True)
* By default, CE3 will discard the route because of BGP loop prevention (same AS in the AS_PATH).
* To allow CE3 to receive the route, the allowas-in or substitute-as command must be configured on PE2.
* # Thus, this statement is true.
3. Evaluating the Answer Choices
Option
Correct?
Reasoning
A
# False
Applying SoO does not directly enable CE3 to receive the route.
B
# False
If both CE1 and CE2 have the same SoO value, CE2 will reject the route.
C
# True
Substitute-AS allows CE3 to accept the route by modifying the AS-Path.
D
# True
Without additional configuration, CE3 will discard the route due to AS-Path loop prevention.
# Correct answer: A and B are false.
Final Conclusion:
* SoO prevents routing loops in MPLS VPN multi-homing.
* CE2 will reject the route if it has the same SoO as CE1.
* CE3 requires the substitute-as or allowas-in command to accept the route.
* Thus, statements A and B are false.
NEW QUESTION # 74
On the OSPF network shown in the figure, the cost values of links are marked. OSPF IP FRR is enabled on R1, and the maximum load-balancing 8 command is configured in the OSPF process. If a service passes through the path R1 # R5 # R3 to reach 10.0.3.3/32, which of the following is the backup outbound interface for the service?
- A. GE0/0/2
- B. There is no backup outbound interface.
- C. GE0/0/3
- D. GE0/0/2 and GE0/0/3
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Step 1: Identify the Primary Path
* The shortest OSPF cost to 10.0.3.3/32 from R1 is through R5:
* R1 # R5 (Cost 10) # R3 (Cost 10) = Total Cost 20
* The primary outbound interface from R1 to R5 is GE0/0/1.
Step 2: Identify the Backup Path (OSPF IP FRR & ECMP)
* OSPF IP Fast Reroute (FRR) provides a backup next-hop in case the primary link (R1 # R5) fails.
* A feasible backup path must have a cost equal to or close to the primary path, but it must avoid the same failure point.
Alternative Path Calculation:
* Path 1 (R1 # R2 # R3)
* R1 # R2 (Cost 10), R2 # R3 (Cost 10) # Total Cost = 20 #
* Uses interface GE0/0/2 on R1.
* Path 2 (R1 # R4 # R3)
* R1 # R4 (Cost 10), R4 # R3 (Cost 10) # Total Cost = 20 #
* Uses interface GE0/0/3 on R1.
Final Decision on the Backup Interface
* Since both paths R1 # R2 # R3 and R1 # R4 # R3 have equal costs, either can be used for backup.
* However, R1 # R2 # R3 shares a direct cost path with R5, meaning it may not be preferred as a full FRR backup.
* The best backup outbound interface in this scenario is GE0/0/3 (R1 # R4 # R3).
Final answer: # C (GE0/0/3)
References:
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF IP FRR (Fast Reroute) Mechanism
* OSPF Equal-Cost Multi-Path (ECMP) and Backup Route Selection
* OSPF Route Calculation and Best-Path Selection
NEW QUESTION # 75
In the figure, a network administrator configures a static LSP to implement MPLS data forwarding. The lower part of the topology shows the packet header information obtained from a device.
Which of the following statements are true?
Options:
- A. Packets from PC2 to PC1 are forwarded based on the IP packet header in the MPLS domain.
- B. If the device is R3, R3 forwards the packet from PC1 to PC2 over an IP route.
- C. Packets from PC1 to PC2 are forwarded based on MPLS labels in the MPLS domain.
- D. PC1 pings PC2.
Answer: C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding the MPLS Data Flow in the Figure
* PC1 (1.1.1.1) sends a ping to PC2 (3.3.3.3).
* The MPLS domain includes R1, R2, and R3.
* R1 pushes an MPLS label onto the packet (Label: 300).
* Packets from PC1 to PC2 are label-switched (MPLS forwarding).
* Packets from PC2 to PC1 do not carry an MPLS label (IP forwarding).
2. Evaluating Each Answer Option
* Option A: "If the device is R3, R3 forwards the packet from PC1 to PC2 over an IP route."
* Incorrect.
* The packet carries an MPLS label (Label 300) when entering the MPLS domain.
* This means that R3 forwards the packet using MPLS, not a standard IP route.
* If R3 were using an IP route, there would be no MPLS label in the packet.
* Option B: "Packets from PC1 to PC2 are forwarded based on MPLS labels in the MPLS domain.
"
* Correct.
* The packet capture shows an MPLS label (Label 300), proving that PC1's traffic is being forwarded using MPLS switching inside the MPLS domain.
* This confirms that MPLS is being used for forwarding in one direction (PC1 # PC2).
* Option C: "Packets from PC2 to PC1 are forwarded based on the IP packet header in the MPLS domain."
* Correct in concept but incorrect in context.
* The packet capture shows that the return traffic (PC2 # PC1) does not have an MPLS label.
* However, the phrase "in the MPLS domain" makes this statement misleading, as R3 is forwarding based on pure IP routing, not MPLS forwarding.
* Option D: "PC1 pings PC2."
* Correct.
* The packet capture clearly shows ICMP Echo Request (ping) from PC1 (1.1.1.1) to PC2 (3.3.3.3) and an ICMP Echo Reply from PC2.
* This confirms that PC1 is pinging PC2 successfully.
Final answer:
# B and D are correct.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* MPLS Label Forwarding and Static LSPs
* MPLS vs. IP Routing in Different Traffic Flows
* Packet Header Analysis in MPLS Networks
NEW QUESTION # 76
As shown in the figure, OSPF is enabled on all interfaces of the router, in which R4 and R5 can establish OSPF virtual connections.
- A. True
- B. False
Answer: B
NEW QUESTION # 77
In order to prevent hackers from attacking user equipment or network through MAC address, the MAC address of untrusted users can be configured as black hole MAC address to filter out illegal MAC
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION # 78
In the intra-domain MPLS VPN network, when the data packet enters the public network and is forwarded, it will be encapsulated with two layers of MPLS labels. Which of the following description of the two layers of labels is wrong?
- A. By default, the outer label is ejected before the packet is forwarded to the last-hop device
- B. The outer label is used to correctly send the data packet to the corresponding VPN on the PE device
- C. The outer label of MPLS VPN is allocated by the LDP protocol or statically, and the inner label is allocated by the MP-BGP neighbor at the correct end.
- D. The outer label of MPLS VPNE is called the private network label, and the inner label is called the public network label.
Answer: D
NEW QUESTION # 79
There is the concept of forwarding equivalence class FEC in MPLS, which of the following description is wrong? (Multiple choice)
- A. The packets of the same FEC will be treated differently in the MPLS network
- B. The division of FEC is very flexible. It can be based on any combination of source address, address, source port, destination port, protocol type or VPN, etc.
- C. MPLS classifies packets with the same forwarding processing method into one category, which is called FEC
- D. A forwarding equivalence FEC will be assigned a unique label value on all routers
Answer: A,D
NEW QUESTION # 80
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