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Huawei H12-831_V1.0-ENU (HCIP-Datacom-Advanced Routing & Switching Technology V1.0) Certification Exam is a professional certification program offered by Huawei Technologies Co. Ltd. HCIP-Datacom-Advanced Routing & Switching Technology V1.0 certification exam is designed to test the candidate's knowledge and skills in advanced routing and switching technologies. HCIP-Datacom-Advanced Routing & Switching Technology V1.0 certification exam is intended for professionals who want to demonstrate their expertise in the field of data communication.
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NEW QUESTION # 20
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 statements is false?
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the IS-IS Topology in the Question:
* R1 (Level-1 Router) is connected to R2 (Level-1-2 Router).
* R2 connects Level-1 and Level-2 areas, making it an inter-area router.
* R3 (Level-2 Router) connects to R2.
* The loopback addresses are:
* R1: 10.0.1.1/32
* R2: 10.0.2.2/32
* R3: 10.0.3.3/32
Key Command Used: default-route-advertise always level-1
* This command forces R1 to advertise a default route (0.0.0.0/0) to Level-1 routers.
* Level-1 routers (like R1) do not have visibility into Level-2 routes unless a default route is provided by an L1-L2 router (R2 in this case).
Analyzing Each Option:
* Option A (TRUE):
* If R1 pings an unknown address like 10.0.4.4, it will use the default route if available. However, if no such route exists, it will not send any packets.
* This behavior is expected, so this statement is true.
* Option B (TRUE):
* 10.0.2.2 (R2) is a Level-1-2 router, and it can communicate with 10.0.3.3 (R3), which is a Level-
2 router.
* Since R2 and R3 are both in Level-2, they can exchange routes.
* So, 10.0.2.2 can ping 10.0.3.3. This statement is true.
* Option C (TRUE):
* 10.0.1.1 (R1) is a Level-1 router, and 10.0.2.2 (R2) is a Level-1-2 router.
* Since R2 is Level-1-2, it shares Level-1 routes with R1, allowing communication between R1 (10.0.1.1) and R2 (10.0.2.2).
* Therefore, this statement is true.
* Option D (FALSE - Correct Answer):
* 10.0.1.1 (R1) is a Level-1 router, which means it only knows about Level-1 routes.
* 10.0.3.3 (R3) is a Level-2 router, and its route is only known by Level-2 routers (R2 & R3).
* Since Level-1 routers do not learn Level-2 routes directly (unless specific redistribution is done), R1 does not have a route to 10.0.3.3.
* Therefore, R1 (10.0.1.1) cannot ping R3 (10.0.3.3), making this statement false.
Conclusion:
The false statement is Option D (10.0.1.1 can ping 10.0.3.3).
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - IS-IS Route Types and Forwarding Principles Huawei Official HCIP-Datacom Study Guide - IS-IS Level-1 and Level-2 Routing Concepts Huawei Documentation on default-route-advertise always level-1 Command
NEW QUESTION # 21
The OSPF protocol is run between CE and PE, when CE1 advertises the route of its site to CE2. Which of the following descriptions is incorrect?
Answer: D
NEW QUESTION # 22
In the OSPF network shown in the figure, area 1 is an NSSA area, area 2 is a common area, and R4 imports external route 10.0.4.4/32. The Router ID of each device is 10.0.0.X, where X is the device number.
The "asbr-summary 10.0.4.0 255.255.255.0" command is configured in the OSPF processes of R1 and R3. Which of the following routers have routing entries for 10.0.4.0/24 in their routing tables? (Multiple choice)
Answer: C,D
NEW QUESTION # 23
On the network shown in the figure, the DHCP server function is enabled on GE0/0/0 of R2, and the address pool is an interface address pool.
When GE0/0/0 and GE0/0/1 of R1 function as DHCP clients, only one interface can obtain an IP address by default.
Options:
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the DHCP Process in This Scenario:
* DHCP Server on R2:
* The DHCP server is configured on interface GE0/0/0 of R2.
* The address pool is an interface address pool, meaning that IP addresses are allocated from the subnet of GE0/0/0 (i.e., 10.0.12.0/24).
* DHCP Clients on R1:
* Both interfaces (GE0/0/0 and GE0/0/1) on R1 are set as DHCP clients, meaning they will send DHCP DISCOVER messages to obtain an IP address dynamically.
* Why Only One Interface Gets an IP Address?
* Interface address pools in Huawei devices assign only one IP address per MAC address (which is typically the router's MAC).
* Since both interfaces belong to R1, they share the same MAC address when making a DHCP request.
* As a result, the DHCP server on R2 only assigns one IP address to the first requesting interface.
* The second request is ignored or denied by the DHCP server due to the duplicate MAC address issue.
Key Takeaways:
* Huawei routers using an interface-based DHCP address pool assign only one IP per MAC address.
* Since both interfaces on R1 have the same MAC, only one gets an IP.
* This behavior is expected in Huawei's HCIP-Datacom-certified DHCP configurations.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Huawei HCIP-Datacom Official Certification Guide, Chapter on DHCP Server and Client Configurations.
* Huawei Datacom Configuration Guide, Section on Interface Address Pools and Address Assignment Limitations.
* Huawei Enterprise Networking Training Materials, DHCP Relay and DHCP Server Behavior.
NEW QUESTION # 24
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?
Answer: A
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 # 25
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