Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - H12-831_V1.0 Exam Practice Test
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 false?
Correct Answer: A,C
Vote an answer
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
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 ?
* 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 ?
Correct Answer: A,C
Vote an answer
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
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:
Which of the following is NOT a possible cause of the BFD session down event?
Options:
Correct Answer: D
Vote an answer
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
In the preparation phase of a migration project , the software and hardware need to be checked. Match the operation objects in the preparation phase with the corresponding operation contents.
Correct Answer:
Explanation:
Network cable # Use a tester to check connectivity.
Device version file # Check the size of the software package and check whether the file matches the device model.
Board # Install the board on a device that is not connected to the network and observe the running status of the device.
License # Check whether the license is in the validity period to prevent device functions from being affected.
Migration personnel list # Check whether responsibilities and permissions are clearly assigned.
Comprehensive and Detailed In-Depth Explanation:
1. Network Cable - Connectivity Testing:
* Before starting a migration project, all network cables should be tested for physical connectivity issues
.
* Network testers can be used to detect any breaks, shorts, or incorrect wiring.
* Ensuring proper connectivity avoids delays and troubleshooting issues during the migration.
2. Device Version File - Software Compatibility Check:
* Firmware and software versions must be verified before upgrading or migrating network devices.
* The device version file should match the model and hardware specifications to avoid compatibility issues.
* If incorrect software is used, the device may not function properly or could become inoperable.
3. Board - Installation and Hardware Verification:
* Before installing new hardware modules (boards, line cards, etc.) into a production environment, they should be tested in isolation .
* Testing ensures the board is operational and does not introduce faults into the system.
* If a board is faulty, it can cause device failure or unexpected behavior in the migration.
4. License - Validity and Activation Check:
* Some network devices require licenses for full functionality (e.g., advanced routing, security features).
* If a license is expired or missing, critical functions may be disabled after migration.
* Checking license status in advance prevents unexpected downtime or service disruptions.
5. Migration Personnel List - Roles and Responsibilities Assignment:
* Large network migrations require clear responsibility assignments for each team member.
* A migration personnel list ensures that everyone knows their role, tasks, and permissions .
* Proper coordination avoids miscommunication, errors, and project delays.
Key Takeaways:
# Network cables should be tested for connectivity.
# Software versions should match the hardware model to prevent incompatibility.
# Hardware boards should be tested before installing into production.
# Licenses should be verified to prevent service disruptions.
# Migration personnel roles should be clearly defined for smooth execution.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Huawei HCIP-Datacom Official Certification Guide , Chapter on Network Migration Best Practices .
* Huawei Enterprise Networking Whitepapers , Guidelines on Software & Hardware Pre-checks for Migration .
* Huawei Technical Documentation , License Management in Huawei Datacom Devices .
On the OSPFv3 network shown in the figure, the LSDB (Link-State Database) of R2 contains ______ Router-LSAs . (Enter only digits.)
Correct Answer:
3
Explanation:
1. Understanding Router-LSAs in OSPFv3
* Router-LSA (Type 1 LSA) is generated by every OSPFv3 router to describe its own links and connected networks within the same area.
* Each router in an OSPF area generates exactly one Router-LSA to advertise its own topology information.
* Router-LSAs are flooded throughout the area but do not cross area boundaries.
2. Analyzing the Given OSPFv3 Network
* The topology consists of three routers: R1, R2, and R3 , all connected in OSPFv3 Area 0 .
* Since all three routers participate in OSPFv3 , each router generates its own Router-LSA (Type 1 LSA) .
* R2, as an OSPF router, will have its own Router-LSA and also receive the Router-LSAs from R1 and R3 .
3. Counting the Number of Router-LSAs in R2's LSDB
* R1 generates 1 Router-LSA (for itself).
* R2 generates 1 Router-LSA (for itself).
* R3 generates 1 Router-LSA (for itself).
* Total Router-LSAs in R2's LSDB = 3 (one from each router).
Final answer:
HCIP-Datacom-Advanced Routing & Switching Technology References:
* OSPFv3 LSA Types and Their Roles
* Understanding Router-LSA (Type 1) and Its Function in LSDB
Explanation:
1. Understanding Router-LSAs in OSPFv3
* Router-LSA (Type 1 LSA) is generated by every OSPFv3 router to describe its own links and connected networks within the same area.
* Each router in an OSPF area generates exactly one Router-LSA to advertise its own topology information.
* Router-LSAs are flooded throughout the area but do not cross area boundaries.
2. Analyzing the Given OSPFv3 Network
* The topology consists of three routers: R1, R2, and R3 , all connected in OSPFv3 Area 0 .
* Since all three routers participate in OSPFv3 , each router generates its own Router-LSA (Type 1 LSA) .
* R2, as an OSPF router, will have its own Router-LSA and also receive the Router-LSAs from R1 and R3 .
3. Counting the Number of Router-LSAs in R2's LSDB
* R1 generates 1 Router-LSA (for itself).
* R2 generates 1 Router-LSA (for itself).
* R3 generates 1 Router-LSA (for itself).
* Total Router-LSAs in R2's LSDB = 3 (one from each router).
Final answer:
HCIP-Datacom-Advanced Routing & Switching Technology References:
* OSPFv3 LSA Types and Their Roles
* Understanding Router-LSA (Type 1) and Its Function in LSDB
On the IS-IS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. Which of the following routers have the default route in their routing tables?
Correct Answer: A,B,D
Vote an answer
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
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 following command in the VLANIF 10 view corresponding to the Super-VLAN .
(Enter lowercase letters.)
(Enter lowercase letters.)
Correct Answer:
inter-sub-vlan-proxy enable
Explanation:
Understanding VLAN Aggregation (Super-VLAN and Sub-VLANs)
* VLAN aggregation allows multiple sub-VLANs to be grouped under a super-VLAN , reducing the number of VLANIF interfaces required for IP address configuration.
* Super-VLAN : A logical VLAN that does not forward Layer 2 traffic directly but is used for Layer 3 communication .
* Sub-VLANs : VLANs that exist within the Super-VLAN but cannot communicate with each other by default.
2# # Why is the " inter-sub-vlan-proxy enable " Command Needed?
* By default, hosts in different sub-VLANs under the same super-VLAN cannot communicate with each other because sub-VLANs do not exchange MAC address information.
* The inter-sub-vlan-proxy enable command allows Layer 3 communication between sub-VLANs under the same super-VLAN by acting as a proxy for ARP requests and replies .
* This enables inter-sub-VLAN communication while still reducing the number of VLANIF interfaces required.
3# # Command Syntax and Execution
* The correct command should be run under the VLANIF interface of the super-VLAN :
[Switch] interface vlanif 10
[Switch-Vlanif10] inter-sub-vlan-proxy enable
Reference: HCIP-Datacom Advanced Routing & Switching Technology - VLAN Aggregation and Inter- Sub-VLAN Communication
Explanation:
Understanding VLAN Aggregation (Super-VLAN and Sub-VLANs)
* VLAN aggregation allows multiple sub-VLANs to be grouped under a super-VLAN , reducing the number of VLANIF interfaces required for IP address configuration.
* Super-VLAN : A logical VLAN that does not forward Layer 2 traffic directly but is used for Layer 3 communication .
* Sub-VLANs : VLANs that exist within the Super-VLAN but cannot communicate with each other by default.
2# # Why is the " inter-sub-vlan-proxy enable " Command Needed?
* By default, hosts in different sub-VLANs under the same super-VLAN cannot communicate with each other because sub-VLANs do not exchange MAC address information.
* The inter-sub-vlan-proxy enable command allows Layer 3 communication between sub-VLANs under the same super-VLAN by acting as a proxy for ARP requests and replies .
* This enables inter-sub-VLAN communication while still reducing the number of VLANIF interfaces required.
3# # Command Syntax and Execution
* The correct command should be run under the VLANIF interface of the super-VLAN :
[Switch] interface vlanif 10
[Switch-Vlanif10] inter-sub-vlan-proxy enable
Reference: HCIP-Datacom Advanced Routing & Switching Technology - VLAN Aggregation and Inter- Sub-VLAN Communication
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.)
* 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.)
Correct Answer:
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 .
On the network shown in the figure, an administrator first completes the routing configuration and then enables MPLS and LDP on R1, R2, and R3 and their interconnected interfaces. In this manner, traffic from PC1 to PC2 can be forwarded based on MPLS . Which of the following routing configurations can implement this function?
Options:
Options:
Correct Answer: A
Vote an answer
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
On a stable network that requires fast route convergence, you can change the value of the interval at which OSPF LSAs are updated to 0 so that topology or route changes can be immediately advertised on the network through LSAs, which speeds up route convergence.
Correct Answer: B
Vote an answer
On the network shown in the figure, PC1 and PC2 are connected to the same switch (SW1) and belong to the same VLAN .
Which of the following are possible causes of a communication failure between PC1 and PC2?
Options:
Which of the following are possible causes of a communication failure between PC1 and PC2?
Options:
Correct Answer: A,B,C,D
Vote an answer
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
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?
Correct Answer: C
Vote an answer
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
The figure shows the Router-LSA generated by a router. Which of the following statements are true based on the LSA?
Correct Answer: B,D
Vote an answer
On the OSPF network shown in the figure, area 1 is an NSSA, area 2 is a common area, and R4 imports an external route 10.0.4.4/32 . The router ID of each router is 10.0.X.X, where X is the router number . If the asbr-summary 10.0.4.0 255.255.255.0 command is run in the OSPF processes of R1 and R3 , which of the following routers have the route 10.0.4.0/24 in their routing tables?
Correct Answer: A,D
Vote an answer
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).