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Die Huawei H12-831_V1.0 (HCIP-Datacom-Advanced Routing & Switching Technology V1.0) Zertifizierungsprüfung ist eine professionelle Zertifizierungsprüfung, die von Huawei angeboten wird. Diese Prüfung soll das Wissen und die Fähigkeiten von IT-Profis in fortgeschrittener Routing- und Switching-Technologie testen. Die Zertifizierung ist für diejenigen gedacht, die ein solides Verständnis von Netzwerktechnologien haben und ihre Fähigkeiten in fortgeschrittenem Routing und Switching verbessern möchten.

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Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 H12-831_V1.0 Prüfungsfragen mit Lösungen (Q183-Q188):

183. Frage
On the OSPFv3 network shown in the figure, area 1 is a common are
a. Which of the following statements are true?

A. The LSDBs of R4 and R5 are the same.
B. R1, R2, and R3 generate Inter-Area-Prefix-LSAs.
C. The LSDBs of R1, R2, and R3 are the same.
D. If R5 imports an external route, R4 does not need to rely on the Inter-Area-Router-LSA to calculate the external route.

Antwort: A,B

184. Frage
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?

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

Antwort: B,D

Begründung:
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.

185. Frage
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)

A. Notication
B. Update
C. Keepalive
D. Open

Antwort: A,B,C,D

186. Frage
The routing policy tools that can be used by BGP mainly include Filter-policy and Route-policy. Fiter-policy can only filter routes, and Route-policy can only modify routes.

A. Yes
B. wrong

Antwort: B

187. Frage
On the network shown in the figure, a network engineer finds that the path between PC1 and PC2 is not the optimal path, and all links along the path have the same cost.
Given this, which of the following routers may be the root bridges of the Layer 2 network?

Options:

A. SW3
B. SW4
C. SW1
D. SW2

Antwort: B,C

Begründung:
Comprehensive and Detailed In-Depth Explanation:
Understanding the Spanning Tree Protocol (STP) and Root Bridge Selection
* Spanning Tree Protocol (STP) is used to prevent loops in a Layer 2 network by electing a Root Bridge and determining a loop-free topology.
* The Root Bridge is elected based on the lowest Bridge ID (BID), which consists of:
* Priority Value (Lower is preferred, default is 32768).
* MAC Address (Lower MAC wins in case of a tie).
* The optimal forwarding path is chosen based on cost, which is usually determined by the link bandwidth.
Why the Path is Not Optimal?
* The network engineer states that all links have the same cost, meaning that the STP Root Bridge election determines the topology rather than cost differences.
* The fact that the path between PC1 and PC2 is suboptimal suggests that the Root Bridge may not be ideally placed.
Determining the Likely Root Bridge:
* The Root Bridge is the switch with the lowest BID (priority + MAC).
* All switches calculate the shortest path to the Root Bridge and place ports in either Forwarding or Blocking mode.
* From the diagram, the traffic is flowing through SW2 # SW4 # SW3 instead of directly via SW2 # SW3.
* This suggests that the Root Bridge is likely SW1 or SW4 because:
* Root Bridges do not block any ports.
* If SW1 or SW4 is the Root Bridge, the spanning tree topology might force the path to take a longer route.
Key Takeaways:
* Root Bridge selection influences the entire Layer 2 forwarding path.
* The lowest Bridge ID (priority + MAC) determines the Root Bridge.
* If a suboptimal path is taken, the Root Bridge is likely placed in a location that forces certain links to block.
* In this scenario, SW1 or SW4 is the most probable Root Bridge, forcing traffic through an unintended path.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Huawei HCIP-Datacom Official Certification Guide, Chapter on Spanning Tree Protocol (STP) and Root Bridge Selection.
* Huawei Datacom Training Materials, Section on STP Convergence and Network Optimization.
* Huawei Datacom Configuration Guide, Command Reference for STP Root Bridge Selection and Path Calculation.

188. Frage
......

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