[Oct 04, 2026] Latest Questions H12-831_V1.0-ENU Guide to Prepare Free Practice Tests [Q27-Q43]

October 4, 2026October 4, 2026 examdumps[Oct 04, 2026] Latest Questions H12-831_V1.0-ENU Guide to Prepare Free Practice Tests [Q27-Q43] 0 Comment

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[Oct 04, 2026] Latest Questions H12-831_V1.0-ENU Guide to Prepare Free Practice Tests

Reliable H12-831_V1.0-ENU Dumps Questions Available as Web-Based Practice Test Engine

Huawei H12-831_V1.0-ENU Exam Syllabus Topics:

Section	Objectives
Network Design and Troubleshooting	– Fault Diagnosis 1. Routing loop troubleshooting 2. Protocol convergence issues – Enterprise Network Design 1. Hierarchical network architecture 2. High availability design principles
Network Services and Optimization	– Multicast Technologies 1. Multicast distribution models 2. PIM protocol operations – QoS Fundamentals 1. Congestion management mechanisms 2. Traffic classification and marking
Advanced Routing Protocols	– BGP Configuration and Policy Control 1. Route filtering and policy control 2. BGP attributes and path selection – OSPF Advanced Features 1. Route calculation and optimization 2. LSA types and area types
MPLS and VPN Technologies	– VPN Implementation 1. Inter-AS VPN scenarios 2. L3VPN configuration principles – MPLS Fundamentals 1. Label switching mechanism 2. LDP basics
IP Network Technologies	– IS-IS Routing Protocol 1. Route convergence and optimization 2. Level-1/Level-2 design – IPv6 Deployment 1. Dual-stack and tunneling technologies 2. IPv6 addressing and transition mechanisms

NEW QUESTION 27
Regarding sham link, which of the following description is wrong?

The sham link is a link between two VPN instances. Each VPN instance must have an endpoint address of the sham link, which must be a Loopback with a 32-bit mask in the VPN address space on the PE router. interface address

In order to forward the VPN flow through the MPLS backbone network, the routing cost of the sham link should be less than the OSPF routing cost of the backdoor road

The endpoint address of the sham link is advertised as a VPhv4 address by BGP. Routes that have passed sam1ik can also be imported into BGP in the form of VPNv4 routes

The sham link can be configured in any area and needs to be configured manually, and there must be a route to the sham link destination address (the sham link endpoint address of the peer PE) in the local VPN instance

NEW QUESTION 28
A network engineer of an enterprise wants to save IP addresses and isolate Layer 2 mutual access by deploying VLAN aggregation and MUX VLAN. In order to save VLAN resources, the engineer can set super VLAN and MUX VAN to the same VLANID.

True

False

NEW QUESTION 29
On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers. The IPv6 address of Loopback0 on R4 is 2000::/128. The IPv6 summary 2000::/64 level-1-2 command is configured in the IS-IS processes of R2 and R1. Which of the following statements is false?

The routing table of R1 contains the route 2000::/64.

The routing table of R2 contains the route 2000::/64.

The routing table of R3 contains the route 2000::/128.

The routing table of R2 contains the route 2000::/128.

Comprehensive and Detailed In-Depth Explanation:
To determine which statement is false, we need to analyze the IS-IS topology, the role of multi-topology, the IPv6 summary configuration, and the level-1-2 behavior of IS-IS routers. Let’s break it down step by step:
* Understanding the IS-IS Topology and Levels :
* IS-IS supports multiple levels: Level-1 (L1) for intra-area routing, Level-2 (L2) for inter-area routing, and Level-1-2 (L1-2) routers that can operate in both levels and connect L1 and L2 areas.
* In the figure, R1 and R2 are configured as Level-1-2 routers, R3 is a Level-1-2 router, R4 is a Level-1 router, and R5 is a Level-1 router. The area borders are indicated by the system IDs (49.0001 for R4’s area and 49.0002 for R3 and R5’s area).
* R4’s Loopback0 has the IPv6 address 2000::/128, which is a host route (a /128 prefix, representing a single address).
* Multi-Topology IS-IS for IPv6 :
* Multi-topology IS-IS allows separate topologies for IPv4 and IPv6, ensuring that IPv6 routes are handled independently. Since multi-topology is enabled on all routers, IPv6 routes (like 2000::
/128 on R4) are advertised and processed within the IPv6 topology.
* This means that IPv6 routes, including the Loopback0 address of R4 (2000::/128), can be advertised across the IS-IS domain, subject to the level and summary configurations.
* IPv6 Summary Configuration (2000::/64 level-1-2) :
* The command ipv6 summary 2000::/64 level-1-2 is configured in the IS-IS processes of R1 and R2. This command instructs R1 and R2 (as Level-1-2 routers) to summarize the IPv6 prefix
2000::/64 and advertise it to both Level-1 and Level-2 areas.
* Summarization means that instead of advertising the more specific route (e.g., 2000::/128 from R4), R1 and R2 advertise the less specific summary route 2000::/64. This summary route covers the 2000::/128 address of R4’s Loopback0.
* Since R1 and R2 are Level-1-2 routers, they can advertise this summary to both their Level-1 neighbors (like R4 and R3) and Level-2 neighbors (across areas).
* Analyzing Each Statement :
* A. The routing table of R1 contains the route 2000::/64.
* True. R1 is a Level-1-2 router with the ipv6 summary 2000::/64 level-1-2 command configured. It advertises and installs the summary route 2000::/64 in its routing table, covering the more specific 2000::/128 from R4. Additionally, as a Level-1-2 router, R1 can learn and retain this route from its IS-IS neighbors.
* B. The routing table of R2 contains the route 2000::/64.
* True. Similar to R1, R2 is also a Level-1-2 router with the same summary command. It advertises and installs the 2000::/64 summary route in its routing table, covering R4’s
2000::/128.
* C. The routing table of R3 contains the route 2000::/128.
* False. R3 is a Level-1-2 router in area 49.0002, but it receives routes from R2 (a Level-1-2 router in area 49.0001). Because R1 and R2 are configured with the ipv6 summary 2000::
/64 level-1-2 command, they advertise the summary route 2000::/64 to their neighbors, including R3. IS-IS prefers the most specific route, but the summary configuration ensures that the more specific 2000::/128 from R4 is not advertised beyond R1 and R2 unless explicitly allowed. Since R3 is in a different area and receives the summary 2000::/64 from R2, it does not have the more specific 2000::/128 route in its routing table. Therefore, this statement is false.
* D. The routing table of R2 contains the route 2000::/128.
* True. R2, as a Level-1-2 router, is directly connected to R4 (a Level-1 router) via the IS-IS topology. R4 advertises its Loopback0 address 2000::/128 to R2. Even though R2 is configured to summarize 2000::/64, it can still retain the more specific 2000::/128 route in its routing table because IS-IS allows routers to keep both summary and more specific routes, with the more specific route taking precedence for routing decisions.
* Conclusion :
* The false statement is C, as R3 does not contain the route 2000::/128 in its routing table. Instead, R3 receives the summary route 2000::/64 from R2 due to the summary configuration on R1 and R2.
References to HCIP-Datacom-Advanced Routing & Switching Technology Documents :
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0, Section on IS-IS: Multi-Topology IS-IS for IPv6, Level-1 and Level-2 Operations, and Route Summarization.
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0, Chapter on IPv6 Routing Protocols:
IS-IS Configuration and Behavior, Including Summary Address Commands and L1/L2 Interactions.

NEW QUESTION 30
In the network shown in the figure, the network engineer found that the path between PC1 and PC2 is not the optimal path, and the cost value of each link is the same. Based on this analysis, which of the following routers may be the root bridge of this layer 2 network? (Multiple choice)

SW4

SW3

SW1

Sw2

NEW QUESTION 31
OSPF is deployed in a campus to realize network interoperability. The L SDB of R2 is shown in the figure. What information can be derived from this LSDB? (Multiple choice)

There is no Type3 LSA in Area1, it may be that the outbound direction of R2 in Area1 is correct. Type3 LSA is filtered

Area 1 is an NSSA area

R2 converts the default route of Type7 LSA to the default route of Type5 LSA

R2 has issued a default route in the OSPF process

NEW QUESTION 32
There are many types of MAC address entries on the switch. Which of the following types are manually configured by the user and cannot be aged? (Multiple choice)

Blackhole MAC address table

MUX MAC address table

Dynamic MAC address table

Static MAC address table

NEW QUESTION 33
The network logical architecture of a cutover project is shown in the figure. The purpose of the cutover is to enable terminals located in different geographical locations to access each other, and the terminal gateway is deployed on the PE.

After the cutover is completed, which of the following methods can network engineers use to preliminarily determine whether the network connectivity is normal? (Multiple choice)

Deploy NQA detection on PE1 and PE2, and set the destination address to the other party’s IP address.

Check the ARP table on PE1 and PE2 to see if there is an ARP entry for the other network segment.

Ping 192.168.2.1 on PE1 using 192.168.1.1 as the source address

Check whether there is a route to the other network segment in the routing table on PE1 and PE2.

NEW QUESTION 34
In the OSPF network shown in the figure, the area number has been marked in the figure, where area 1, area 2, and area 3 are all common areas. The IP address of the R5 Loopback0 interface is 10.0.5.5/32, and the interface is enabled with OSPF through the network method. ACL 2000 is configured on all routers, and the matching rules are shown in the figure.

In area 0 of R1, R2, and R3, “filte 2000 export” is configured. Which of the following routers’ routing tables do not have a route entry for 10.0.5.5/32? (Multiple choice)

NEW QUESTION 35
Part of the configuration of R1 is as follows. Which statement about OSPF on R1 is correct?
ospf 1 router-id 172.16.1.1
area 0.000
network 10.1.12.1 0.0.0.0
network 10.1″3″0.0.0.0
network 172.16/1 1 0.0.0.0
ospf 2 vpn-instance tt
area QQO.O
network 10J J 1 0.000

VRF ttThe routing information will appear inOSPFprocess1in the routing table

process1and process2ofOSPF LSD8within its areaLSAinconsistent

process1and process2ofOSPF-LSDBits area0InsideLSAexactly the same

VRFttThe routing information will not be available nowOSPFprocess1in the routing table

NEW QUESTION 36
In the absence of a header, the LDP adjacencies will trigger the establishment of LSPO based on the IP routing of the 32-bit address.

True

False

NEW QUESTION 37
Which packets can Huawei equipment perform traffic suppression for? (Multiple choice)

unknown Unicast

Known unicast

Multicast

Broadcast

NEW QUESTION 38
In the network shown in the figure, PC1 and PC2 are connected to the same switch and belong to the same VLAN. Which of the following reasons may cause PC1 and PC2 to be unable to communicate with each other? (Multiple choice)

SW1 is configured with port isolation

SW1 GE0/0/2 interface is shut down

SW1 GE0/0/1 interface link failure

The host has wrong static ARP configuration

NEW QUESTION 39
As shown in the figure:

There is Type 5 LSA flooding in Area2

There is no Type 3 LSA flooding in Area2

There is Type 5 LSA flooding in Area1

There is no Type3 LSA flooding in Area1

NEW QUESTION 40
Both VLAN aggregation and MUX VLAN are deployed on the enterprise network shown in the figure.
* All switch interfaces connected to terminals are access interfaces.
* Given this, match PC1 to PC4 with the hosts or servers they can access on the network.
( Note: A host cannot be matched with itself. For example, PC1 cannot match PC1. Tokens can be reused.)

Explanation:

Comprehensive and Detailed In-Depth Explanation:
To determine the correct matches, we need to analyze VLAN aggregation and MUX VLAN behavior in the given topology.
1. Understanding VLAN Aggregation and MUX VLAN Roles
* VLAN Aggregation :
* Sub-VLANs (e.g., VLAN 10) are part of a Super-VLAN (e.g., VLAN 100) and share a common gateway.
* Hosts in the same Sub-VLAN can communicate directly.
* MUX VLAN (Multiple User Group VLAN) :
* Principal VLAN (VLAN 30) : Includes servers , accessible by all VLAN types.
* Separate VLAN (VLAN 20) : Cannot communicate with other Separate VLAN hosts, but can communicate with the Principal VLAN (Server) .
* Group VLAN (VLAN 10 – Sub-VLANs) : Hosts within the same Group VLAN can communicate, and they can also access the Principal VLAN (Server) .
2. Analyzing the Connectivity
* PC1 (Sub-VLAN 10 – Employee VLAN)
* Can communicate with PC2 (same Sub-VLAN).
* Can communicate with the Server (VLAN 30 – Principal VLAN).
* PC2 (Sub-VLAN 10 – Employee VLAN)
* Can communicate with PC1 (same Sub-VLAN).
* Can communicate with the Server (VLAN 30 – Principal VLAN).
* PC3 (VLAN 20 – Separate VLAN – Guest VLAN)
* Cannot communicate with other PCs in Employee VLAN (PC1, PC2) or Guest VLAN (PC4).
* Can communicate with the Server (VLAN 30 – Principal VLAN).
* PC4 (VLAN 20 – Separate VLAN – Guest VLAN)
* Cannot communicate with other PCs in Employee VLAN (PC1, PC2) or Guest VLAN (PC3).
* Can communicate with the Server (VLAN 30 – Principal VLAN).
* Server (VLAN 30 – Principal VLAN)
* Can communicate with all PCs (PC1, PC2, PC3, PC4) because it belongs to the Principal VLAN, which serves all VLANs .

NEW QUESTION 41
On the OSPFv3 network shown in the figure, OSPFv3 is enabled on the interfaces connecting R1, R2, and R3. The router ID of each router is 10.0.X.X, where X is the number of the router.
If you check detailed information about an LSA on R3, the command output shows that R1 and R2 are DRs on the network.
Options:

TRUE

FALSE

Comprehensive and Detailed In-Depth Explanation:
1. Understanding OSPFv3 and DR/BDR Election
* In OSPFv3, on broadcast and non-broadcast networks, routers elect a Designated Router (DR) and a Backup Designated Router (BDR) to reduce LSA flooding.
* The DR is responsible for generating Network LSAs (Type 2 LSAs) for the subnet.
* The BDR takes over if the DR fails.
* Other routers (DROther) only form adjacencies with the DR and BDR but still receive LSAs.
2. Understanding the LSA Output in the Figure
* The LSA shown in the figure is a Type 1 (Router LSA).
* The originating router is R2 (Router ID: 10.0.2.2).
* The LSA lists two “Transit Network” links connected to R2.
* The Neighbor Router IDs listed are 10.0.1.1 (R1) and 10.0.2.2 (R2).
3. Why the Statement is FALSE
* A transit network (broadcast network) should have only ONE DR.
* R1 and R2 both being DRs is incorrect, as only one DR per subnet should exist.
* The presence of two “Transit Network” entries in the LSA suggests that there are two separate OSPF broadcast networks, each with its own DR.
* This means R1 and R2 are each DRs on separate networks, but not both DRs on the same network.
Final Answer:
HCIP-Datacom-Advanced Routing & Switching Technology References:
* OSPFv3 DR/BDR Election Process
* OSPFv3 LSA Types and Their Roles
* OSPFv3 Network Topology and LSA Interpretation

NEW QUESTION 42
To ensure security, authentication can be configured in the OSPFv3 process area view.

TRUE

FALSE

NEW QUESTION 43
EGP authentication can prevent illegal routers from establishing neighbors with BCP routers. BCP authentication can be divided into MD5 authentication and Keychain authentication. Which of the following BGP messages will carry BCGP Keychain authentication information? ((Multiple choice)

Open

Update

Notification

Keepalive

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