H12-891_V1.0テスト難易度 & H12-891_V1.0試験

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Huawei H12-891_V1.0 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Bearer WAN Planning and Deployment	15%	- SR (Segment Routing) 1. SR-MPLS 2. SRv6 - VPN Services 1. EVPN 2. L3VPN - Traffic Engineering 1. Flex-Algo 2. SR-TE 3. RSVP-TE
Topic 2: Network Automation	17%	- iMaster NCE 1. Intent-Driven Networking - NCE (Network Cloud Engine) 1. Architecture 2. Deployment - Automation Technologies 1. NETCONF/YANG 2. Python Scripting 3. Ansible 4. RESTful API
Topic 3: Advanced Routing and Switching Technology	37%	- Route Control 1. IP Prefix List 2. ACL 3. Route-policy 4. Route Filtering - OSPF 1. LSA Types 2. Basic Concepts 3. Area Types 4. Route Calculation 5. Configurations and Troubleshooting - BGP 1. Basic Concepts 2. Configurations and Troubleshooting 3. Route Aggregation 4. Routing Policies 5. Path Selection - Ethernet Switching 1. VLAN 2. STP/RSTP/MSTP 3. Stack & CSS 4. VXLAN - IS-IS 1. Route Leaking 2. Basic Concepts 3. Configurations and Troubleshooting 4. Addressing 5. Network Types - MPLS 1. Basic Concepts 2. LDP 3. MPLS TE 4. Configurations 5. MPLS VPN
Topic 4: Campus Network Planning and Deployment	23%	- Network Services 1. WLAN 2. Network Security 3. QoS - Campus Network Architecture 1. Spine-Leaf Architecture 2. Hierarchical Design - Underlay Network 1. IP Address Planning 2. Physical Layer Design - Overlay Network (VXLAN) 1. VXLAN Gateway 2. BGP EVPN
Topic 5: WAN Interconnection Network Planning and Deployment	8%	- MPLS VPN 1. Hub-Spoke 2. Full-Mesh - Inter-AS VPN 1. Option B 2. Option A 3. Option C - SD-WAN 1. Orchestrator 2. Architecture

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H12-891_V1.0試験 & H12-891_V1.0必殺問題集

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Huawei HCIE-Datacom V1.0 認定 H12-891_V1.0 試験問題 (Q305-Q310):

質問 # 305
Telemetry data must be encoded in GPB binary format. This format reduces the number of bytes in telemetry messages and improves the transmission efficiency compared with messages encoded in JSON format.

A. TRUE
B. FALSE

正解：B

解説：
Understanding Telemetry Encoding Formats
# What is Telemetry?
* Telemetry is a real-time network monitoring method that provides high-frequency data collection.
* Used in AI-driven networks for predictive analytics and automation.
# Common Telemetry Encoding Formats:
# GPB (Google Protocol Buffers)
* Highly efficient binary format that reduces message size and CPU overhead.
* Commonly used for high-speed, real-time analytics.
# JSON (JavaScript Object Notation)
* Human-readable format, widely used in RESTful APIs.
* Less efficient than GPB in high-speed telemetry but easier to debug.
# Why is the Answer FALSE?# GPB is not mandatory; JSON can also be used in telemetry.# Huawei supports both GPB and JSON telemetry encoding formats.
Real-World Application:
* Cloud Networking: Uses GPB for fast data collection and JSON for API-based telemetry visualization.
* AI-Driven Networks: High-speed AI analytics leverage GPB encoding for efficiency.
# Reference: Huawei HCIE-Datacom Guide - Telemetry Encoding Formats and Data Collection

質問 # 306
Exhibit:

The following figure shows the inter-AS MPLS VPN Option C (solution 2). RRs are deployed, and no traffic passes through the RRs during forwarding. If a data packet sent from PE2 to192.168.1.1carries two labels, which of the following statements about the two labels are correct?

A. T1 is allocated by RR2.
B. V1 is allocated by PE1.
C. T1 is allocated by P2.
D. V1 is allocated by P2.

正解：B、C

解説：
Understanding Inter-AS MPLS VPN Option C (Solution 2)
In MPLS L3VPN Inter-AS Option C, the Route Reflectors (RRs) are used for VPN route distribution but do not participate in data forwarding. The traffic forwarding path is based on MPLS labels assigned at different routers.
Each data packet carries two MPLS labels:
Transport Label (T1) - Used for forwarding within the backbone.
VPN Label (V1) - Used for VPN route identification.
Breaking Down the Labels:
#VPN Label (V1) - Allocated by PE1 (answer: C#)
V1 (Inner Label) is the VPN label assigned by the egress PE router (PE1).
This label ensures that when the packet reaches PE1, it knows how to forward the traffic to CE1 (192.168.1.1).
#Transport Label (T1) - Allocated by P2 (answer: B#)
T1 (Outer Label) is the transport label assigned by P2 to forward the packet across the AS core.
This label ensures the packet reaches the next-hop router (ASBR-PE1 in AS100).
Why Are the Other Options Incorrect?
#A. " T1 is allocated by RR2 " (Incorrect)
RR2 is used only for route reflection; it does not participate in label allocation or forwarding.
#D. " V1 is allocated by P2 " (Incorrect)
P2 is an intermediate router and does not allocate VPN labels.
VPN labels are always assigned by the egress PE router (PE1 in AS100).
# Reference:Huawei HCIE Datacom - MPLS L3VPN Inter-AS Option C

質問 # 307
On the campus network shown, IPv6 is deployed for service tests. Four routers are deployed on the network, and these routers use OSPFv3 for network connectivity. Which of the following statements about LSAs generated by the OSPFv3 network is incorrect?

A. R1 receives two Link-LSAs generated by R2. The two Link-LSAs describe information about the two links connected to R2.
B. R2 functions as an area border router (ABR), generates Inter-Area-Prefix-LSAs that describe the IPv6 address prefix of area 1, and advertises these Inter-Area-Prefix-LSAs to R1 and R3.
C. The LSDB of R1 contains Network-LSAs generated by R3, indicating that R3 may be the DR on the local link.
D. R1 generates Router-LSAs describing interface information and receives Router-LSAs generated by R2 and R3.

正解：A

解説：
Let ' s dissect each option based on OSPFv3 LSA behavior from Huawei HCIE Datacom documentation.
# Option A: Correct
OSPFv3 uses Router LSAs (Type 1) to describe the local interfaces, links, and neighbors.
R1, as part of Area 0, will generate Router-LSAs and receive Router-LSAs from neighbors in the same area (R2 and R3 via switch S1).
Huawei Datacom Reference:
" Each OSPFv3 router originates a Type 1 Router LSA for each area it belongs to. " (Source: HCIE-Datacom Study Guide v3.0 - OSPFv3 Fundamentals)
# Option B: Incorrect (Correct Answer)
Link-LSAs (Type 8) are not sent between routers. They are only generated for each link on which the router has at least one neighbor. These LSAs are only flooded on the local link.
R1 cannot receive two Link-LSAs from R2 about both links. It can only receive the Link-LSA that R2 generates for the shared link with R1. The other link (e.g., to R4 in Area 1) is irrelevant to R1.
Huawei Datacom Reference:
" A Link LSA is generated by a router for each attached link and is sent only to the routers on the same link. " (Source: HCIE-Datacom Study Guide v3.0 - OSPFv3 LSA Types)
# Option C: Correct
On broadcast links, DRs generate Type 2 Network LSAs.
If R3 is the DR on the shared segment (with R1), R1 will have the Network-LSA from R3 in its LSDB.
Huawei Datacom Reference:
" The DR on a broadcast network generates a Type 2 Network LSA to describe all routers on that link. " (Source: HCIE-Datacom Study Guide v3.0 - OSPFv3 LSDB Construction)
# Option D: Correct
R2 connects Area 0 and Area 1, hence it ' s an ABR.
ABRs generate Type 3 Inter-Area-Prefix LSAs to advertise IPv6 prefixes from one area to another.
R2 advertises Area 1 prefixes to Area 0 routers (R1 and R3).
Huawei Datacom Reference:
" Inter-Area-Prefix LSAs (Type 3) are generated by ABRs to advertise IPv6 prefixes from one area into another. " (Source: HCIE-Datacom Study Guide v3.0 - ABR Functionality in OSPFv3)

質問 # 308
Router HW1 exists in the carrier HW's network as an MPLSLSR router. The router receives a packet carrying a label, but the label entry does not exist in its LFIB. So how does the router handle that message?

A. Router HW1 strips off the label and looks for the FIB using the P destination address
B. Router HW1 will forward the message with the default label
C. Router HW1 uses LDP to create an LSP and creates a new path in LFIB for the label carried in the message
D. Router HW1 drops the message

正解：D

質問 # 309
MPLS implements data forwarding based on two different planes. Which of the following statements regarding the forwarding mechanism are correct?

A. If the tunnel ID is 0x0, the MPLS forwarding process starts.
B. If the tunnel ID is not 0x0, the normal IP forwarding process starts.
C. After an IP packet enters an MPLS domain, the MPLS device forwards the packet based on FIB table queries.
D. The system automatically assigns an ID to the upper-layer application that uses a tunnel. This ID is also called the tunnel ID.

正解：D

解説：
Understanding MPLS Forwarding Mechanism
MPLS (Multiprotocol Label Switching) is a high-performance forwarding mechanism that operates on two planes:
1## Control Plane:
* Establishes Label Switched Paths (LSPs) using protocols like LDP (Label Distribution Protocol), RSVP-TE (Resource Reservation Protocol - Traffic Engineering), or BGP-LU (BGP Label Unicast).
* Assigns labels to packets based on routing policies.
2## Data Plane (Forwarding Plane):
* Uses a Label Forwarding Information Base (LFIB) instead of traditional IP routing.
* Packets are forwarded based on labels, not IP addresses.
Analysis of the Answer Choices
# C. The system automatically assigns an ID to the upper-layer application that uses a tunnel. This ID is also called the tunnel ID.
* Correct: MPLS assigns a Tunnel ID to applications that utilize tunnels (e.g., VPNs, MPLS-TE, or L2
/L3 services).
* This ID helps differentiate between various tunnel applications, ensuring traffic follows the correct LSP.
# A. After an IP packet enters an MPLS domain, the MPLS device forwards the packet based on FIB table queries.
* Incorrect: MPLS routers do NOT use the FIB (Forwarding Information Base) for forwarding once labels are assigned.
* Instead, they use LFIB (Label Forwarding Information Base) to switch packets based on labels.
# B. If the tunnel ID is 0x0, the MPLS forwarding process starts.
* Incorrect: If the Tunnel ID is 0x0, MPLS does NOT start; it means no label is assigned, and traditional IP forwarding occurs.
# D. If the tunnel ID is not 0x0, the normal IP forwarding process starts.
* Incorrect: If the Tunnel ID is not 0x0, MPLS forwards traffic using label switching, not IP forwarding.

質問 # 310
......

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