Free Huawei H12-831_V1.0 Practice Exam with Questions & Answers | Set: 6

VLAN aggregation and MUX VLAN provide different networking functions and use distinct VLAN roles.

VLAN aggregation combines multiple sub-VLANs under a super-VLAN. The sub-VLANs share the IP subnet and default gateway of the super-VLAN, reducing IP address consumption.

MUX VLAN controls Layer 2 communication using principal, group, and separate VLANs. It allows administrators to restrict communication among hosts while maintaining access to designated resources.

However, Huawei ' s MUX VLAN configuration requirements explicitly prohibit using the VLAN ID of a principal VLAN as a super-VLAN or sub-VLAN.

Consequently, an administrator cannot assign the same VLAN ID simultaneously to a super-VLAN and the principal MUX VLAN.

Separate VLAN identifiers must be allocated for the relevant VLAN functions to avoid configuration conflicts.

Therefore, the statement is FALSE.

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

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???? Topology Breakdown:

IS-IS IPv6 is running between R2, R3, and R6.

R6’s loopback0 address is 2000::6/128.

R6 is in Area 2, which is an NSSA, and R2/R3 are Level-1-2 routers.

OSPFv3 runs in other parts of the network (R1, R4, R5).

IS-IS IPv6 routes are being redistributed into OSPFv3 by R2 and R3.

???? Option A: The routing table of R1 contains the route 2000::6/128.

✅ True

R3 redistributes IS-IS into OSPFv3.

R3 is connected to Area 0, so the route reaches R1 via normal OSPFv3 inter-area routing.

???? Option B: The routing table of R6 contains the route ::/0.

❌ False

Area 2 is an NSSA, which does not receive Type-5 external LSAs by default.

R6 is in the IS-IS domain only and is not part of the OSPFv3 backbone.

Unless a default route (default-information originate) is configured in redistribution from OSPFv3 to IS-IS (not stated), R6 will not have ::/0.

???? Option C: The routing table of R4 contains the route 2000::6/128.

✅ True

R2 is a Level-1-2 router and redistributes IS-IS routes into OSPFv3.

Area 1 is a normal/common OSPF area, so R4 receives the route from R2 via OSPFv3 Type-5 or Type-3 LSAs.

???? Option D: The routing table of R5 contains the route 2000::6/128.

✅ True

R3 redistributes IS-IS into OSPFv3 in Area 2 (which is NSSA).

OSPFv3 uses Type-7 LSAs in NSSA, which are converted into Type-5 LSAs by the NSSA ABR (R3).

R5 is in Area 2 and will receive the Type-7 LSA directly or the Type-5 LSA after conversion, so it can learn the 2000::6/128 route.

✅ Final Answer: A, C, D

Official Huawei Extract:

" When IS-IS routes are imported into OSPFv3, they are advertised as external routes using Type-5 LSAs in standard areas, and as Type-7 LSAs in NSSAs. NSSA ABRs convert Type-7 LSAs into Type-5 LSAs for propagation into other areas. "

" Common areas can receive redistributed external routes, and routing propagation from IS-IS into OSPFv3 is supported via import-route. "

— [Huawei HCIA-Datacom Certification Guide – IPv6, IS-IS, and OSPFv3 Redistribution Sections]

Huawei VRP supports output filtering by appending a pipe and a filtering action to a display command. The include action retains output lines that match the specified regular expression. Therefore:

display current-configuration | include 10.0.2.*

displays the lines in the current configuration that match the 10.0.2.* expression. Any configuration line containing the text 10.0.2 satisfies the intended match, and the trailing .* allows zero or more following characters. This makes the statement true in the context of Huawei’s command-output filtering behavior.

Strictly speaking, the period is a regular-expression metacharacter representing any single character. Consequently, the expression may also match strings in which another character appears where a literal period was intended. If an administrator requires an exact literal IPv4-style match, the periods should be escaped according to the VRP regular-expression syntax. That precision does not alter the exam answer: the supplied command can display all matching current-configuration lines containing 10.0.2.

Huawei’s documentation confirms that | include regular-expression filters display-command output and shows display current-configuration | include ... as the standard usage pattern. Huawei CLI output filtering

Step 1: Understanding OSPF Areas and Summarization

Area 1 (NSSA - Not So Stubby Area)

Allows external routes but converts Type-5 LSAs into Type-7 LSAs.

External routes must be translated by an ABR into Type-5 LSAs before being propagated into other areas.

Area 2 (Common Area - Regular OSPF Area)

Supports both inter-area and external routes.

asbr-summary 10.0.4.0 255.255.255.0 Command

This command summarizes all external routes within 10.0.4.0/24 into a single summarized route.

Since it is applied on R1 and R3, these routers will advertise 10.0.4.0/24 instead of 10.0.4.4/32 to their respective areas.

Step 2: Route Distribution Analysis

R4 (Originating Router in NSSA - Area 1)

R4 injects 10.0.4.4/32 as a Type-7 LSA into Area 1.

R1 (ABR between Area 1 & Area 0, Summarizing Route)

Since R1 is an ABR, it translates Type-7 LSAs from Area 1 into a summarized Type-5 LSA (10.0.4.0/24) for Area 0.

✅ R1 has 10.0.4.0/24 in its routing table.

R2 (Inside Backbone Area 0, No ASBR Summary Applied Here)

R2 only receives Type-5 LSAs from R1 but does not summarize them.

Since R2 is not explicitly summarizing, it will likely still see 10.0.4.4/32 rather than 10.0.4.0/24.

❌ R2 does not have 10.0.4.0/24.

R3 (ABR between Area 0 & Area 2, Summarizing Route)

R3 is also an ABR and has the asbr-summary 10.0.4.0/24 command configured.

It will advertise the summarized route 10.0.4.0/24 into Area 2.

✅ R3 has 10.0.4.0/24 in its routing table.

R5 (Inside Area 2, No Direct Connectivity to External Routes)

Since R3 summarizes 10.0.4.0/24, R5 (inside Area 2) will receive only summarized routes.

✅ R5 has 10.0.4.0/24.

Final Answer: ✅ R1, R3 (Option A, C)

Huawei switches support storm control to prevent excessive broadcast, unknown multicast, and unknown unicast traffic from affecting network availability.

The displayed command configures broadcast storm control with a minimum threshold of 5000 packets per second (pps) and a maximum threshold of 8000 pps.

The switch monitors the average incoming broadcast packet rate during the storm detection interval.

When this rate reaches or exceeds the maximum threshold, the configured storm control action is triggered. Depending on the action configuration, the interface may block the affected traffic or enter the error-down state.

Options A and B specify 8500 pps and 9000 pps, respectively. Both exceed the configured maximum threshold.

Options C and D are below the maximum threshold and therefore do not trigger a new storm control action.

The correct answers are A and B.

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

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The ipv6 default-route-advertise always level-1 command instructs an IS-IS router to advertise an IPv6 default route, ::/0, unconditionally in its Level-1 routing domain.

In area 49.0001, R4 is a Level-1 router, while R1 and R2 are Level-1-2 routers. R4 advertises the default route through Level-1 LSPs, allowing R1 and R2 to learn it.

In area 49.0002, R5 is a Level-1 router and R3 is a Level-1-2 router. R5 similarly advertises a default route to R3.

The level-1 parameter limits the advertisements to their respective Level-1 areas. These advertisements are not automatically flooded throughout the Level-2 backbone.

R4 originates its own default-route advertisement rather than learning one from R1 or R2 in this scenario.

Therefore, R1, R2, and R3 have learned default routes.

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Comprehensive and Detailed In-Depth Explanation:

1. Understanding the Routing Issue

R1 and R4 are BGP routers and have an IBGP connection.

R2 and R3 are OSPF-only routers (they do not run BGP).

Networks 10.1.1.0/24 and 10.4.4.0/24 are advertised into BGP but not OSPF.

PC1 (10.1.1.1) and PC2 (10.4.4.1) need communication, but their networks are not known to OSPF routers R2 and R3.

To fix this, we need a method that ensures R2 and R3 learn the routes for 10.1.1.0/24 and 10.4.4.0/24.

2. Evaluating Each Answer Option

Option A: " Deploy policy-based routing on R1 and specify R2 as the next hop for traffic from PC1 to PC2. "

Incorrect.

Policy-Based Routing (PBR) does not solve the issue of missing routes in OSPF.

Even if R1 forwards traffic to R2, R2 does not know how to reach 10.4.4.0/24, causing packet drops.

A proper routing protocol solution is required instead of PBR.

Option B: " Deploy MPLS and LDP on R1 to R4 and establish LSPs for routes 1.1.1.1/32 and 4.4.4.4/32. "

Incorrect.

MPLS requires label-switched paths (LSPs) but does not distribute routing information itself.

The real problem is that R2 and R3 do not have routing entries for 10.1.1.0/24 and 10.4.4.0/24.

MPLS does not fix the missing route advertisement issue.

Option C: " Run BGP on R2 and R3, and establish full-mesh IBGP connections in AS 123. "

Correct.

If R2 and R3 run BGP, they can form IBGP sessions with R1 and R4 and learn routes 10.1.1.0/24 and 10.4.4.0/24 via BGP.

R2 and R3 would then be able to forward traffic correctly between PC1 and PC2.

This is a valid method to fix the issue.

Option D: " On R1 and R4, import routes 10.1.1.0/24 and 10.4.4.0/24 into OSPF. "

Correct.

By redistributing BGP routes into OSPF, R1 and R4 can ensure that R2 and R3 learn the missing networks (10.1.1.0/24 and 10.4.4.0/24) via OSPF.

This allows full reachability without running BGP on R2 and R3.

This is another valid method to fix the issue.

Final Answer:

✅ C and D are correct.

HCIP-Datacom-Advanced Routing & Switching Technology References:

BGP and OSPF Route Redistribution

IBGP Full-Mesh Requirement and Route Propagation

How Policy-Based Routing Works and Its Limitations