Free H12-831_V1.0 Questions Attempt

Comprehensive and Detailed In-Depth Explanation:

Understanding OSPF Areas and Route Propagation in the Network:

OSPF Area Types in the Question:

Area 0 (Backbone Area): Connects all areas and distributes routing information.

Area 1 (Standard Area): Regular OSPF area that can receive and forward external routes.

Area 2 (Totally NSSA - Totally Not-So-Stubby Area):

Does not allow external routes except for a default route injected by the ABR.

Area 3 (NSSA - Not-So-Stubby Area):

Allows external routes as Type 7 LSAs but does not accept Type 5 LSAs.

How External Routes Are Advertised in This Scenario:

R5 (in Area 3) imports 10.0.5.5/32 as an external route into OSPF.

Since Area 3 is an NSSA, the external route is advertised as a Type 7 LSA (not Type 5).

The ABR (R1) converts the Type 7 LSA into a Type 5 LSA and advertises it into Area 0.

Once in Area 0, this Type 5 LSA can be distributed to other areas except totally stubby or totally NSSA areas.

Route Distribution Analysis:

R5 (Area 3) → R1 (Area 0, ABR):

R5 generates a Type 7 LSA for 10.0.5.5/32.

R1 (ABR) converts this Type 7 LSA into a Type 5 LSA and injects it into Area 0.

R2 (Area 0) → R3 (Area 0):

Since Area 0 allows external Type 5 LSAs, R2 and R3 receive 10.0.5.5/32.✅ R2 and R3 have the route.

R6 (Area 1) → Connected to Area 0:

Area 1 is a common area, meaning it can receive external Type 5 LSAs.✅ R6 has the route.

R4 (Area 2 - Totally NSSA):

Totally NSSA areas do NOT accept Type 5 or Type 7 LSAs.

Instead, they receive only a default route from the ABR (R3).

Since R4 does not receive external routes explicitly, it does NOT have 10.0.5.5/32.❌ R4 does NOT have the route.

Final Conclusion:

✅ R2, R3, and R6 have the route 10.0.5.5/32.

❌ R4 does not have the route because Area 2 is a Totally NSSA and only gets a default route.

Thus, the correct answer is:

✅ R2, R3, and R6 have the route 10.0.5.5/32 in their routing tables.

Huawei VRP requires MPLS and the Label Distribution Protocol (LDP) to be enabled at both the global and interface levels before dynamic label-switched paths can be established over an interface.

First, the mpls command enables the global MPLS function. Next, mpls ldp enables the global LDP process. These commands establish the necessary control-plane functionality.

At the interface level, mpls enables MPLS processing on GE0/0/1, and mpls ldp enables LDP neighbor discovery and label distribution through that interface.

All four commands are necessary in the configuration sequence shown in Huawei ' s training material. In a complete deployment, the administrator must also configure an appropriate MPLS LSR ID and ensure IP connectivity between neighboring devices.

Therefore, all four options are correct.

HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Training Material.pdf

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???? Debug Logs on R2:

nginx

CopyEdit

Received OPEN from 10.0.1.1...

Router ID: 10.0.1.1, AS: 100

Received OPEN from 10.0.2.2...

Router ID: 10.0.2.2, AS: 200

The OPEN message exchanged during BGP neighbor establishment contains:

Router ID of the peer

AS number

Hold time

Capabilities

From the logs:

R2 received R1’s OPEN message with:

Router ID = 10.0.1.1

AS = 100

R2 ' s own OPEN message shows:

Router ID = 10.0.2.2

AS = 200

This gives us the exact matching required.

Official Huawei Extract:

" In BGP, the OPEN message contains the router ID and AS number of the sender. These values are exchanged during session establishment and are visible via debugging logs or display bgp peer outputs. "

— [Huawei HCIA-Datacom Guide – BGP Peer Establishment and Debugging]

Huawei network devices provide several information-management mechanisms, including logs, traps, debugging information, and SNMP management data.

Log information is the appropriate starting point when investigating a configuration change made by an administrator.

Depending on the device software version and enabled logging functions, configuration-operation logs may record commands executed by administrators, including IP address modifications and deletions.

The administrator can examine available logs using commands such as display logbuffer or investigate saved log files.

SNMP agent information primarily provides information used by management systems. Trap messages normally report significant events or state changes, while debugging information provides detailed protocol or system diagnostics.

Neither traps nor debugging output is the primary source for reconstructing an accidental configuration change.

Therefore, option C is correct. Recovering the exact deleted address depends on whether the relevant configuration-operation records were retained.

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