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| Section | Objectives |
|---|---|
| Advanced Routing Protocols | - OSPF Advanced Concepts
|
| BGP and Internet Routing | - BGP fundamentals
|
| Network Design and Troubleshooting | - Troubleshooting methods
|
| IPv6 and Network Services | - Network services
|
| MPLS and VPN Technologies | - MPLS fundamentals
|
>> H12-831_V1.0 Practice Exam <<
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NEW QUESTION # 149
Which of the following commands can be used to view BGP VPNv4 routing and BGP private network routing information on PE?
Answer: C
NEW QUESTION # 150
On the OSPFv3 network shown in the figure:
* OSPFv3 is enabled on the interfaces connecting R1, R2, and R3.
* The router ID of each router is 10.0.X.X, where X is the number of the router.
* If you check detailed information about an LSA on R3 , the command output shows that the LSA is generated by R2 and describes the IPv6 prefix address associated with the Router-LSA .
Is this statement TRUE or FALSE ?
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the LSA Table in the Figure
The LSA Type displayed in the LSDB of R3 is an Intra-Area-Prefix-LSA (Type 9) , with the following attributes:
* LS Type: Intra-Area-Prefix-LSA (Type 9)
* Link State ID: 0.0.0.1
* Originating Router: 10.0.2.2 (R2)
* Referenced LSA Type: 0x2001 (Router-LSA, Type 1)
* Referenced Link State ID: 0.0.0.0
* Referenced Originating Router: 10.0.2.2 (R2)
* Prefix: 2000:2::/128
Analysis of the Statement
* What is an Intra-Area-Prefix-LSA (Type 9)?
* Used in OSPFv3 to advertise IPv6 prefixes associated with a Router-LSA (Type 1) or Network-LSA (Type 2).
* Each router generates its own Router-LSA (Type 1) and references it in an Intra-Area- Prefix-LSA (Type 9).
* How does this apply to R3 ' s LSDB?
* The LSA is generated by R2 (10.0.2.2), meaning R2 originated the prefix advertisement.
* The referenced LSA is a Router-LSA, indicating that the IPv6 prefix is associated with R2 ' s router advertisement.
* Since R3 sees this LSA in its LSDB, it means R2 has advertised its IPv6 prefix (2000:2::
/128) into the OSPFv3 domain.
# Since the LSA describes an IPv6 prefix associated with R2's Router-LSA, the statement is TRUE.
Final Conclusion:
# The LSA is generated by R2 and describes the IPv6 prefix associated with the Router-LSA.
# Thus, the correct answer is: A. TRUE.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPFv3 LSA Types and IPv6 Prefix Advertisement Huawei Official HCIP-Datacom Study Guide - OSPFv3 Intra-Area-Prefix-LSA and Router-LSA Relationship Huawei Documentation on OSPFv3 LSAs and Neighbor Advertisement
NEW QUESTION # 151
What is the meaning of the display current-configuration I include vlan command?
Answer: A
NEW QUESTION # 152
On the enterprise network shown in the figure, R3 is connected to the NMS, and all devices on the network communicate with the NMS through a VPN.
During an inspection, it is found that R3 has redundant RTs (Route Targets).
Which of the following commands can be run on R3 to delete the redundant RTs without affecting the connectivity between all devices and the NMS?
Options:
Answer: C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding VPN Route Targets (RTs) in MPLS VPNs
* Route Targets (RTs) define which VPN routes should be imported and exported among PE routers.
* Import-extcommunity: Specifies which VPN routes should be accepted into a VRF.
* Export-extcommunity: Specifies which VPN routes should be advertised from a VRF.
* Correctly configuring RTs ensures proper route exchange between VPN sites.
2. Analyzing the RTs in the Diagram
R3's Current Configuration:
plaintext
CopyEdit
vpn-target 3:1 export-extcommunity
vpn-target 3:2 export-extcommunity
vpn-target 1:3 export-extcommunity
vpn-target 1:3 import-extcommunity
vpn-target 3:1 import-extcommunity
vpn-target 3:2 import-extcommunity
R1's Configuration:
plaintext
CopyEdit
vpn-target 1:3 export-extcommunity
vpn-target 3:1 import-extcommunity
R2's Configuration:
plaintext
CopyEdit
vpn-target 2:3 export-extcommunity
vpn-target 3:2 import-extcommunity
* R3 has redundant RTs because it both exports and imports unnecessary RTs.
* We need to remove only redundant RTs without affecting NMS connectivity.
3. Evaluating Each Answer Choice
A: "undo vpn-target 3:1 import-extcommunity" (# Incorrect)
* R1 exports RT 1:3, and R3 imports it as 3:1.
* Removing 3:1 import-extcommunity would block R3 from receiving routes from R1, disrupting connectivity to NMS.
* Thus, this option is incorrect.
B: "undo vpn-target 1:3 export-extcommunity" (# Correct)
* R3 exports RT 1:3, but there is no need for R3 to advertise routes with 1:3.
* R1 already exports 1:3, and R3 only needs to import it.
* Removing vpn-target 1:3 export-extcommunity does not affect connectivity but eliminates redundancy.
* # This is a correct choice.
C: "undo vpn-target 1:3 import-extcommunity" (# Incorrect)
* R3 needs to import 1:3 to receive routes from R1 (which is required for NMS communication).
* If removed, R3 will not receive necessary routes, breaking connectivity.
* Thus, this option is incorrect.
D: "undo vpn-target 2:3 export-extcommunity" (# Correct)
* R2 exports RT 2:3, but R3 does not need to receive it.
* This RT is redundant and can be removed without affecting connectivity.
* # This is a correct choice.
4. Evaluating the Answer Choices
Option
Correct?
Reasoning
A
# Incorrect
R3 must import 3:1 from R1 to maintain connectivity.
B
# Correct
Removing export-extcommunity 1:3 eliminates redundancy without affecting connectivity.
C
# Incorrect
Removing import-extcommunity 1:3 would block R3 from receiving necessary routes.
D
# Correct
Removing export-extcommunity 2:3 eliminates redundancy without affecting connectivity.
# Correct answer: B and D.
Final Conclusion:
* Route Targets (RTs) are used in MPLS VPNs to control route import/export policies.
* R3 has redundant RTs, and removing unnecessary exports (1:3 and 2:3) optimizes configuration.
* Correct commands to remove redundancy without affecting connectivity are:
* # undo vpn-target 1:3 export-extcommunity
* # undo vpn-target 2:3 export-extcommunity
* Thus, the correct answer is: B and D.
NEW QUESTION # 153
A network engineer provides a troubleshooting report after rectifying a fault. The actual network is simplified into the one shown in the figure, where R1 and R2 both have OSPF enabled, and function as the gateways of PC1 and PC2, respectively.
Given this, which of the following statements is false?
Answer: C
NEW QUESTION # 154
......
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