[Q71-Q91] Free Sample Questions to Practice H12-831_V1.0-ENU Certification Test Engine [Feb-2026]

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Free Sample Questions to Practice H12-831_V1.0-ENU Certification Test Engine [Feb-2026]

2026 Valid H12-831_V1.0-ENU Real Exam Questions, practice HCIP-Datacom

NEW QUESTION 71
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?

For 192.168.2.0/24, R2 preferentially selects the BGP route received from R3.

For 192.168.1.0/24, R3 preferentially selects the BGP route received from R2.

For 192.168.2.0/24, R5 preferentially selects the BGP route received from R3.

For 192.168.1.0/24, R6 preferentially selects the BGP route received from R2.

NEW QUESTION 72
On a BGP/MPLS IP VPN network, which of the following are carried when a PE advertises VPNv4 routes?

IPv4 prefix

Export target

Import target

NEW QUESTION 73
There is a concept of forwarding equivalence class (FEC-Fowarding Equivalence Class) in MPLS, so FEC does not Can the allocation be made based on which of the following criteria?

Service type(Class of Service)

sFragment offset (Fragment office)

Application protocol(Application Protocol)

target address(Destination Addess)

NEW QUESTION 74
On the network shown in the figure, EBGP peer relationships are established between ASs through directly connected interfaces.
* OSPF is deployed in AS 65456 (with OSPF disabled on interconnected interfaces between ASs).
* R4 and R5 use Loopback0 to establish iBGP peer relationships with R6.
* The IP address of Loopback0 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.
* R1, R2, and R3 import the external route 192.168.1.0/24 into BGP through the import-route command.

Which of the following statements are true?

For 192.168.1.0/24, R5 preferentially selects the route received from R2.

For 192.168.1.0/24, R4 preferentially selects the route received from R1.

For 192.168.1.0/24, if the default local-preference 150 command is configured on R3, R5 preferentially selects the route received from R3.

For 192.168.1.0/24, R6 preferentially selects the route received from R4.

Comprehensive and Detailed In-Depth Explanation:
Understanding the BGP and OSPF Network Topology in the Question:
* External Route Importation
* R1, R2, and R3 import 192.168.1.0/24 into BGP from an external source.
* This means R1, R2, and R3 will advertise this route to their EBGP and iBGP peers.
* BGP Route Selection Criteria
* BGP follows specific rules to determine the best path for a route. The most relevant factors here are:
* Highest Local Preference (LOCAL_PREF) # Preferred
* Shortest AS Path # Preferred
* Lowest Origin Type (IGP < EGP < Incomplete) # Preferred
* Lowest MED (Multi-Exit Discriminator) # Preferred
* Oldest eBGP route (if paths are equal) # Preferred
Route Selection Analysis for Each Statement:
A: For 192.168.1.0/24, R5 preferentially selects the route received from R2. # (Correct)
* R5 is in AS 65456 and peers with R6 using iBGP.
* Since R2 is a central router with direct connectivity to R5, it is the most preferred path compared to indirect paths from R1 or R3.
* By default, R5 will prefer the path from R2 over others unless explicitly influenced by BGP attributes.
# Statement A is correct.
B: For 192.168.1.0/24, R4 preferentially selects the route received from R1. # (Incorrect)
* R4 and R5 use Loopback0 to establish iBGP with R6, meaning they receive BGP routes from multiple sources.
* BGP prefers the shortest AS path, and there is no specific information indicating that R1’s path is the shortest for R4.
* R4 may actually prefer another router’s advertisement (e.g., R2 or R3) depending on AS path length and other attributes.
# Statement B is incorrect.
C: For 192.168.1.0/24, if the default local-preference 150 command is configured on R3, R5 preferentially selects the route received from R3. # (Correct)
* By default, BGP assigns a local-preference of 100.
* If R3 sets local-preference to 150, it is higher than other routes (R1, R2).
* BGP prefers the highest local-preference value, so R5 will prefer the route received from R3 if this attribute is set.
# Statement C is correct.
D: For 192.168.1.0/24, R6 preferentially selects the route received from R4. # (Incorrect)
* R6 is an iBGP peer of both R4 and R5.
* BGP best-path selection depends on attributes like local-preference, AS-path, and MED.
* There is no explicit information suggesting that R4’s advertisement is preferred over R5’s.
* R6 may prefer R5’s route depending on attributes.
# Statement D is incorrect.
Final Conclusion:
# A. R5 preferentially selects the route received from R2.# B. R4 does not necessarily prefer R1’s route.
# C. If R3 sets local-preference 150, R5 will prefer the route from R3.# D. R6 does not necessarily prefer R4’s route.
Thus, the correct answers are: A, C.

NEW QUESTION 75
The Discovery message of LDP is used for neighbor discovery, and LDP has different discovery mechanisms when discovering neighbors. Then, which of the following statements about Discovery message in the basic discovery mechanism is correct? (Multiple choice)

After the TCP connection is established, the LSR does not continue to send Hello Message

The destination IP address of the message is the multicast IP address 224.0.0.2

This message is encapsulated in a UDP message, and the destination port number is 646

The message is sent to the designated LDP Peer

NEW QUESTION 76
OSPF is deployed in a campus to achieve network interworking, and OSPF is also enabled on the GEO/0/2 interface of R3. Area1 is deployed as an NSSA area, and the device addresses are shown in the figure. An engineer configures a static route on R3 to access the loopback interface address of R4, and imports the static route in the 0SPF process. At this point, in the Type5 LSA received by R1, the forwarding address (FA) is____. (Note: Please fill in the IP address without mask)

(10.1.23.2)

NEW QUESTION 77
What types of Link Types are included in the Router LSA in OSPF? (Multiple choice)

Vlink

StubNet

TransNet

P-2-P

NEW QUESTION 78
On the network shown in the figure, IS-IS IPv6 runs on R2, R6, and R3, and the IPv6 address of Loopback0 on R6 is 2000::6/128. OSPFv3 runs on other links. Area 1 is a stub area, and Area 2 is an NSSA. IS-IS routes are imported to OSPFv3 on R2 and R3. Which of the following statements are true?

The routing table of R6 contains the route ::/0.

The routing table of R5 contains the route 2000::6/128.

The routing table of R4 contains the route 2000::6/128.

The routing table of R1 contains the route 2000::6/128.

Comprehensive and Detailed In-Depth Explanation:
To analyze the correct answer, we need to break down the topology and protocol behaviors step by step:
* Understanding the IS-IS and OSPFv3 Network Setup:
* IS-IS IPv6 is running between R2, R6, and R3.
* OSPFv3 is running on other links.
* Area 1 is a stub area, which means it does not accept external routes but can have a default route (::/0).
* Area 2 is an NSSA (Not-So-Stubby Area), meaning it allows external routes as NSSA external LSAs.
* Analysis of Each Answer Option:
A: “The routing table of R6 contains the route ::/0.” # FALSE
* R6 only participates in IS-IS (Level-1) and does not receive a default route (::/0) from Level-
2 routers.
* Since R6 is in IS-IS Level-1 and does not have a connection to a Level-2 router that provides a default route, it will not have a ::/0 route in its routing table.

NEW QUESTION 79
R1 forwards a packet with the destination IP address of 4.4.4.4 on an MPLS network.
* Some LSP (Label Switched Path) information of R3 is shown in the figure.
* During packet transmission, which of the following devices perform MPLS label operations?

Comprehensive and Detailed In-Depth Explanation:
To determine which devices perform MPLS label operations, we need to analyze MPLS forwarding behavior based on the roles of each router in the MPLS domain.
1. Understanding MPLS Label Operations
MPLS label switching involves three main operations:
* Label Push (Ingress LSR – Label Imposition): The ingress router (R1) assigns an MPLS label to the packet.
* Label Swap (Transit LSR – Label Forwarding): The transit routers (R2, R3) swap the label for the next-hop router.
* Label Pop (Egress LSR – Label Disposition): The egress router (R4) removes the MPLS label before forwarding the packet to its final destination.
2. Examining MPLS Roles of Each Router
# R1 (Ingress LSR) # Performs Label PUSH
* R1 adds an MPLS label (1025) to the IP packet and forwards it to R2.
* Operation: Push MPLS Label (Label Imposition).
* # R1 performs MPLS label operations.
# R2 (Transit LSR) # Performs Label SWAP
* R2 receives a labeled packet (1025) from R1, swaps it with label 1026, and forwards it to R3.
* Operation: Swap MPLS Label (Transit Label Forwarding).
* # R2 performs MPLS label operations.
# R3 (Transit LSR) # Performs Label SWAP
* R3 receives label 1026 and swaps it with label 3, then forwards it to R4.
* Operation: Swap MPLS Label (Transit Label Forwarding).
* # R3 performs MPLS label operations.
# R4 (Egress LSR) # Does NOT Perform MPLS Operations
* R4 is the egress router and does not forward the packet further using MPLS.
* The last router removes the MPLS label (Pop) and forwards the plain IP packet.
* R4 is NOT performing MPLS label switching (swap or push), only popping the label before delivering the packet.
* # R4 does NOT perform MPLS label operations.

NEW QUESTION 80
In the figure, the company wants to ensure secure communication between the headquarters and branch, and isolate the R&D areas from non-R&D areas, without changing the current network deployment.
To meet this requirement, an administrator deploys BGP/MPLS IP VPN on the network.

Which of the following statements are true?

To enable communication between the headquarters and branch R&D areas, both the ERT and IRT of VPN1 and VPN2 can be set to 100:100.

To implement communication between the headquarters and branch R&D areas, the RDs of VPN1 and VPN2 need to be set to the same value.

R&D areas and non-R&D areas have overlapping address spaces. Therefore, services in the two areas cannot be isolated.

To isolate R&D areas from non-R&D areas at the headquarters, the RTs of VPN1 can all be set to 100:100 and the RTs of VPN3 can all be set to 200:200.

Comprehensive and Detailed In-Depth Explanation:
To verify the correct answers, let’s analyze how BGP/MPLS IP VPN is used for secure communication and isolation in an enterprise network.
1. Understanding BGP/MPLS IP VPN Concepts
MPLS VPN (Multiprotocol Label Switching Virtual Private Network) is used to:
* Allow communication between specific sites by using Route Targets (RTs).
* Ensure isolation of specific areas (e.g., R&D vs. non-R&D) by controlling RT import/export policies
.
* Utilize Route Distinguisher (RD) to make overlapping IP addresses unique within the VPN.
2. Analyzing the Answer Choices
# A. “To enable communication between the headquarters and branch R&D areas, both the ERT and IRT of VPN1 and VPN2 can be set to 100:100.” # TRUE
* Explanation:
* ERT (Export Route Target) and IRT (Import Route Target) define which VPNs share routing information.
* If VPN1 (HQ R&D) and VPN2 (Branch R&D) use the same RT (100:100), they will exchange routes, enabling communication.
* Correct configuration:
VPN1: ERT 100:100, IRT 100:100
VPN2: ERT 100:100, IRT 100:100
* # This is correct and enables communication between HQ and branch R&D areas.
# B. “To implement communication between the headquarters and branch R&D areas, the RDs of VPN1 and VPN2 need to be set to the same value.” # FALSE
* Explanation:
* RD (Route Distinguisher) is only used to make overlapping IP addresses unique within the MPLS VPN.
* RD does NOT control route exchange between VPNs (RTs control route exchange).
* VPN1 and VPN2 can have different RDs but still communicate if they share the same RT (100:100).
* # RDs do NOT need to be the same for VPNs to communicate.
* # This statement is false.
# C. “R&D areas and non-R&D areas have overlapping address spaces. Therefore, services in the two areas cannot be isolated.” # FALSE
* Explanation:
* Overlapping address spaces are common in MPLS VPNs and can be isolated using unique Route Targets (RTs).
* As long as VPNs have different RTs, their traffic remains isolated.
* For example:
VPN1 (R&D): RT 100:100
VPN3 (non-R&D): RT 200:200
* Even with overlapping IPs, R&D and non-R&D areas are completely isolated.
* # This statement is false.
# D. “To isolate R&D areas from non-R&D areas at the headquarters, the RTs of VPN1 can all be set to 100:100 and the RTs of VPN3 can all be set to 200:200.” # TRUE
* Explanation:
* Setting different RTs for R&D (100:100) and non-R&D (200:200) ensures complete isolation
.
* Correct configuration:
VPN1 (R&D): RT 100:100
VPN3 (non-R&D): RT 200:200
* Since VPN1 and VPN3 do NOT share the same RTs, their routes remain separate.
* # This ensures isolation between R&D and non-R&D areas.

NEW QUESTION 81
Service routes of an enterprise are transmitted on the network. Some configurations of PE1 and PE2 are shown in the figure. Which of the following LSAs may CE2 receive?

Type 5 LSA

Type 1 LSA

Type 3 LSA

Type 7 LSA

NEW QUESTION 82
As shown in the figure, 0SPF is enabled on all interfaces of the router. The cost value of the link is marked in the figure, R2’s LoogbackO is advertised by mouth in area 0, then in In area 1, both R2 and R3 transmit the routing information of 10.0.2.2/32 in the form of Typae3 LSA.

True

False

NEW QUESTION 83
By default, the Domain ID of each OSPF process running on the router is the same as the process number of the process, which can be modified by the domain-id command under the process

TRUE

FALSE

NEW QUESTION 84
Regarding the MPLS forwarding process, the description of Ingress node forwarding is correct:

IngressAfter the node receives the data packet, it will first checkILMlooking forTunnel ID

existIPThe obtained label is pressed into the packet, and according to theQoSPolicy processingEXRSimultaneous processingL,,Then the packagedMPLSThe packet is sent to the next hop

according toILMtableTunnel IDfind the correspondingNHLFEentry, willLFIBentry andNHLFEtable entry

CheckNHLFETable entry, you can get outbound interface, next hop, outbound label and label operation type The label operation type isPush

NEW QUESTION 85
A company purchased private lines from two operators. In order to optimize the lines, the company used the 6GP protocol to learn from two Route entries that operate off. However, after the enterprise found that this configuration, the traffic of the port route increased greatly, and the network engineering arrangement After investigation, it was found that the traffic of the two operators was passed to each other through the enterprise egress router. Therefore, the enterprise intends to use the routing strategy so that the traffic of the packets of different carriers is no longer passed to each other. Is the configuration in the following figure correct?

True

False

NEW QUESTION 86
As shown in the figure, OSPF is enabled on all interfaces of the router, and the ip address identified in the figure is the device’s IP address.
Loopback0 presses the IP address of the port, RI, R2, R3EJLoopbacD is advertised in the area 1, R4 LoopbacfkD advertises in area D and which of the following functional addresses can be pinged between the LoopbackD announcements of R5 and R5 in area 2?

Areal
10.0.1.1/32

10.0.3.3 10.0.5.5

10.0.4.4and10.0.2.2

10.0.2.2and10.0.3.3

10.0.2.2 10.0.5.5

NEW QUESTION 87
According to this picture, we can judge that R4 is on?

1 default route

2 equal-cost default routes

2 default routes with different costs

4 equivalent default routes

NEW QUESTION 88
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?

For 192.168.2.0/24, R2 preferentially selects the BGP route received from R3.

For 192.168.1.0/24, R3 preferentially selects the BGP route received from R2.

For 192.168.2.0/24, R5 preferentially selects the BGP route received from R3.

For 192.168.1.0/24, R6 preferentially selects the BGP route received from R2.

NEW QUESTION 89
VLAN aggregation is configured on a switched network. Sub-VLAN 2 and Sub-VLAN 3 are added to Super-VLAN 10.
To enable hosts in different Sub-VLANs to communicate with each other, run the _____ inter-sub-vlan- proxy enable command in the view of VLANIF 10, corresponding to the Super-VLAN.
(Enter the answer in lowercase letters only.)

supervlan
Explanation:
1. Understanding VLAN Aggregation in Huawei Switches
* VLAN aggregation is a technique that groups multiple VLANs (sub-VLANs) under a single Super- VLAN.
* Super-VLANs do not have member interfaces but include multiple Sub-VLANs that share a common gateway (VLANIF interface).
2. Inter-Sub-VLAN Communication Requirement
* By default, hosts in different sub-VLANs cannot communicate directly.
* To enable communication between different sub-VLANs within the same Super-VLAN, an inter- sub-VLAN proxy must be enabled.
* This is done using the inter-sub-vlan-proxy enable command in the VLANIF interface of the Super- VLAN.
3. Correct Command Usage
* The command format is:
shell
CopyEdit
supervlan inter-sub-vlan-proxy enable
* This command must be executed under VLANIF 10, corresponding to the Super-VLAN.
4. Why is the Answer “supervlan”?
* The missing parameter in the command should be supervlan, because it is used to enable communication between Sub-VLANs under a Super-VLAN.
* This is a specific Huawei command used in HCIP-Datacom-Advanced Routing & Switching Technology certification.

NEW QUESTION 90
As shown below:

R3andR1ofIS-LevelMismatch

R3andR1different area codes

R3andR1ofIIHAuthentication failed

R3andR1ofSystem

NEW QUESTION 91
A network engineer provides a troubleshooting report after rectifying a fault. The actual network is simplified into the one shown in the figure, where R1 and R2 both have OSPF enabled, and function as the gateways of PCI and PC2, respectively. Given this, which of the following statements is false?

The OSPF routing table of R1 contains a route to 192.168.1.0/24.

The router LSA generated by R1 contains information with the link ID being 192.168.1.0.

R1 cannot ping 192.168.1.2.

PC1 and PC2 cannot ping each other.

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