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| Section | Weight | Objectives |
|---|---|---|
| Network Cutover | 7% | - Cutover planning and risk assessment - Post-cutover validation - Implementation and rollback strategy - Pre-cutover verification |
| IPv6 Routing | 20% | - OSPFv3 and IS-IS for IPv6 - IPv6 address planning and configuration - BGP4+ for IPv6 - Transition mechanisms (dual-stack, tunnel, translation) |
| Advanced BGP Features | 10% | - Routing policies and filtering - Route reflectors and confederations - BGP multi-homing and load balancing - BGP route selection and attributes |
| Network Troubleshooting | 10% | - Routing protocol fault diagnosis - Structured troubleshooting methodology - Performance and service fault resolution - Switching and link fault handling |
| Network O&M | 7% | - Routine maintenance procedures - Network monitoring and performance analysis - Log and alarm management - Configuration management and backup |
| Advanced Ethernet Technologies | 10% | - Ethernet link aggregation and reliability - Port isolation and security features - QinQ and VLAN mapping - VLAN aggregation and MUX VLAN |
| MPLS Technologies | 19% | - MPLS fundamentals and label distribution - MPLS OAM and protection - LDP and RSVP-TE protocols - MPLS VPN (L3VPN, L2VPN) |
| Advanced IGP Features | 17% | - IS-IS advanced features
|
>> H12-831_V1.0 Most Reliable Questions <<
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NEW QUESTION # 20
MP-BGP uses the new path attribute to advertise VPNv4 routes or withdraw unreachable routes on a BGP/MPLS IP VPN network.
Answer: A
Explanation:
MP-BGP (Multiprotocol BGP) is an extension of BGP that supports multiple address families , including VPNv4 routes .
* MP-BGP introduces a new BGP path attribute called MP_REACH_NLRI (for route advertisement) and MP_UNREACH_NLRI (for route withdrawal).
* These attributes are used for:
* Advertising VPNv4 and VPNv6 routes
* Withdrawing unreachable VPNv4/VPNv6 routes
* Supporting other AFI/SAFI combinations beyond IPv4 unicast
# Official Reference from Huawei:
" MP-BGP introduces MP_REACH_NLRI and MP_UNREACH_NLRI attributes to advertise or withdraw VPNv4/VPNv6 routes. "
- [Huawei HCIA-Datacom Certification Guide - BGP/MPLS VPN Section]
NEW QUESTION # 21
The figure shows the LSP information of R1 and R2 on an MPLS network. An administrator runs the ping
3.3.3.3 command on R1. Given this, which of the following statements is true?
Answer: B
Explanation:
The display mpls lsp output on R1 contains the following entry for FEC 3.3.3.3/32:
In/Out Label: NULL/1025
Out Interface: GE0/0/1
NULL/1025 means R1 is the ingress LSR for this LSP. The packet initially has no label, so R1 performs a push operation and sends it toward R2 with label 1025.
R2's corresponding entry is:
In/Out Label: 1025/3
Out Interface: GE0/0/1
Label value 3 is the MPLS implicit-null label. It is not placed in the outgoing packet. Instead, it instructs the penultimate-hop router-R2-to remove label 1025. This operation is called penultimate-hop popping (PHP).
R2 consequently sends an unlabeled IPv4 packet to egress router R3, which processes the packet using normal IP forwarding.
Therefore, the packet sent from R1 carries label 1025, and R2 removes the label before forwarding it toward R3. Huawei MPLS label operations and PHP
NEW QUESTION # 22
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: A,B
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 # 23
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 are true?
Network Topology:
* R1:
* Interface GE0/0/0 : 10.0.12.1/24 (Connected to R2)
* Interface GE0/0/1 : 192.168.1.1/24 (Gateway for PC1)
R2:
* Interface GE0/0/0 : 10.0.12.2/24 (Connected to R1)
* Interface GE0/0/1 : 192.168.1.2/24 (Gateway for PC2)
Options:
Answer: B,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
* Understanding the network connectivity:
* R1 and R2 are connected through 10.0.12.0/24 and running OSPF in Area 0.
* PC1 (192.168.1.11/24) is connected to R1 , and PC2 (192.168.1.12/24) is connected to R2 .
* Analyzing each option:
* Option A: " R2 cannot ping 10.0.12.1. " # Incorrect
* R2 is directly connected to 10.0.12.1/24 (R1) on GE0/0/0 , so it can ping this IP without any routing issues.
* Option B: " PC1 and PC2 cannot ping each other. " # Correct
* OSPF is only running between R1 and R2 . There is no indication that R1 and R2 are redistributing connected routes (192.168.1.0/24 and 192.168.1.0/24) into OSPF.
* As a result, R1 does not know how to reach 192.168.1.12 , and R2 does not know how to reach 192.168.1.11 , making communication between PC1 and PC2 impossible .
* Option C: " R1 cannot ping 192.168.1.2. " # Incorrect
* 192.168.1.2 is directly connected to R2 , and if R1 can reach R2 through OSPF, then R1 should be able to ping 192.168.1.2.
* Option D: " R1 cannot ping 192.168.1.12. " # Correct
* 192.168.1.12 is connected to R2 , but if R2 does not advertise this network to R1, R1 has no route to reach it .
* Since PC1 (192.168.1.11) and PC2 (192.168.1.12) are on different subnets, and there ' s no redistribution , R1 cannot reach PC2 ' s IP .
Key Takeaways and Fix Recommendations:
* To allow PC1 and PC2 to communicate , R1 and R2 must advertise their directly connected networks (192.168.1.0/24) in OSPF using the network command or by redistributing connected routes into OSPF.
* Command example:
makefile
CopyEdit
R1:
router ospf 1
network 192.168.1.0 0.0.0.255 area 0
R2:
router ospf 1
network 192.168.1.0 0.0.0.255 area 0
* This would allow R1 to learn about PC2 ' s network and R2 to learn about PC1 ' s network , enabling communication.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* HCIP-Datacom Official Certification Guide , Chapter on OSPF Network Design and Troubleshooting .
* Huawei Datacom Training Materials , Section on OSPF Inter-Area and External Route Advertisements .
* Huawei Datacom Configuration Guide , Command Reference for OSPF network advertisement and route redistribution .
NEW QUESTION # 24
Please match 0SPFv3LSA with its transmission range.
Answer: A
Explanation:
AS-external-LSA Autonomous system-wide intra-regional propagation
Network-1SA intra-regional spread
NEW QUESTION # 25
......
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