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| Section | Objectives |
|---|---|
| Topic 1: Routing and Switching Technologies | - Switching technologies
|
| Topic 2: Data Center and Virtualization Technologies | - VXLAN and overlay networks
|
| Topic 3: Network Automation and Programmability | - SDN and automation
|
| Topic 4: Network Security and QoS | - QoS mechanisms
|
| Topic 5: IPv6 and Advanced IP Technologies | - IPv6 deployment
|
| Topic 6: Enterprise Network Architecture | - Network design principles
|
| Topic 7: WAN and VPN Technologies | - MPLS fundamentals
|
>> Certification H12-891_V1.0 Exam <<
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NEW QUESTION # 132
In SSM, what version of IGMP is required?
Answer: A
NEW QUESTION # 133
There is an existing switch running the RSTP protocol. If the network topology changes, what happens to the Layer 2 forwarding table that is automatically learned by the switch?
Answer: E
NEW QUESTION # 134
OSPF is deployed on a campus network to implement network interconnection. An engineer configures R2 as shown in the figure. Which of the following statements is incorrect about LSAs on the OSPF network?
Answer: D
Explanation:
๐ Analyze the Configuration:
[R2] acl 2000
[R2-acl-basic-2000] rule deny
[R2] ospf
[R2-ospf-1] area 1
[R2-ospf-1-area-0.0.0.1] filter 2000 import
[R2-ospf-1-area-0.0.0.1] quit
[R2-ospf-1] default-route-advertise always
๐ Understanding Key Concepts:
Type 3 LSAs (Inter-Area Routes):
Generated by ABRs to advertise summary routes between areas.
Filtering Type 3 LSAs is possible using import filters (like in Area 1).
Type 5 LSAs (External Routes):
Flooded only within the same AS but do not enter stub or NSSA areas.
โ
Breakdown of the Options:
A . Type 5 LSAs are flooded in Area 1 โ โ Incorrect
If Area 1 is a stub or NSSA, then Type 5 LSAs are not allowed.
Although the diagram does not explicitly say Area 1 is a stub/NSSA, real deployments often use stub areas at the edge (like Area 1).
More importantly, the filter is applied to Area 1, and there is no redistribution of external routes into Area 1 in the config.
Therefore, Type 5 LSAs would not be flooded there.
B . Type 3 LSAs are not flooded in Area 1 โ โ
Correct
The command filter 2000 import with ACL rule deny means Type 3 LSAs are filtered from Area 0 into Area 1.
C . Type 3 LSAs are not flooded in Area 2 โ โ
Correct
There is no filter applied to Area 2, so this could be false, but since the question asks for the incorrect statement, this is not the answer.
D . Type 5 LSAs are flooded in Area 2 โ โ
Correct
Area 2 is not shown to be stub or NSSA, and there's no filter or restriction configured.
Hence, Type 5 LSAs are allowed and flooded in Area 2.
NEW QUESTION # 135
OSPF is deployed on a campus network to implement network interconnection. The LSDB of R2 is shown in the figure.
What can be determined from the LSDB?
Answer: A,D
Explanation:
To analyze this question, let's break down the key concepts and the given LSDB (Link State Database) information from the figure:
Understanding the LSDB Output:
The output shows the OSPF LSDB on R2 with Router ID 10.1.123.2.
Area 0.0.0.0 (Area 0) is displayed along with several Link State Advertisements (LSAs) including Router LSAs, Network LSAs, and Summary LSAs.
Area 0.0.0.1 (Area 1) also displays Router LSAs and a Type 7 LSA (NSSA LSA) with Link-State ID 0.0.0.0.
An External LSA (Type 5) with Link-State ID 0.0.0.0 and AdvRouter 10.1.123.2 is also present.
Analysis of Each Option:
Option A: Area 1 is an NSSA.
Correct.
The presence of a Type 7 LSA (NSSA LSA) in the database indicates that Area 1 is configured as an NSSA (Not-So-Stubby Area).
NSSA allows the injection of Type 7 LSAs for external routes while blocking Type 5 LSAs from entering the area.
Option B: R2 translates Type 7 default route into Type 5 default route.
Correct.
In an NSSA, if an ABR (like R2) has the NSSA ASBR capability, it will convert Type 7 LSAs to Type 5 LSAs before injecting them into the backbone area (Area 0).
In the LSDB, we see both a Type 7 LSA (NSSA) and a corresponding Type 5 External LSA, confirming that R2 performs this translation.
Option C: R2 advertises the default route in the OSPF process.
Incorrect.
There is no indication that R2 itself is originating the default route.
The Type 7 LSA in Area 1 and the Type 5 LSA in Area 0 only indicate translation from another source, not R2 advertising it directly.
Option D: Area 1 does not have Type 3 LSAs. The possible cause is that R2 filters Type 3 LSAs in the outbound direction of Area 1.
Incorrect.
In an NSSA area, Type 3 LSAs (Inter-Area Prefix LSAs) are typically not generated for external routes.
The absence of Type 3 LSAs in Area 1 is due to the nature of NSSA itself rather than any filtering configured on R2.
NEW QUESTION # 136
SR-MPLS uses IGP extensions to advertise labels and reserve bandwidth to support high-bandwidth services.
Answer: B
Explanation:
SR-MPLS leverages IGP (OSPF/IS-IS) extensions to advertise Segment IDs (SIDs) and can also integrate with TE (Traffic Engineering) for bandwidth reservation using RSVP-TE or SR-TE.
Exact Extract - Huawei SR-MPLS Configuration Guide:
"SR-MPLS uses extensions in IGP to distribute label bindings and, combined with traffic engineering, supports bandwidth assurance and high-bandwidth services." Reference:
Huawei SR-MPLS Deployment Guide
HCIE-Datacom Training Manual - Traffic Engineering with SR
NEW QUESTION # 137
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