H12-891_V1.0 Exam Dumps - HCIE-Datacom V1.0

Huawei Open Programmability System (OPS) and HTTP Request Headers

HuaweiOPSallowsnetwork automation and programmabilitythroughHTTP-based APIs. When using Python scripts to sendHTTP requests to network devices, the requestheaders must specify the content formatfor data exchange.

✅B. Content-Type: text/json, Accept: text/json (Correct Answer)

Content-Type: text/json→ Specifies that the request bodycontains JSON-formatted data.

Accept: text/json→ Specifies that theresponse should be in JSON format.

Understanding DSCP & Assured Forwarding (AF) Classes

DSCP (Differentiated Services Code Point)is used forQoS (Quality of Service)classification inIP packet headers.

Assured Forwarding (AF) classesprovidefour traffic classes(AF1x, AF2x, AF3x, AF4x).

EachAF classhasthree drop precedence levels(Low = 1, Medium = 2, High = 3).

Analysis of Options:

AF43 (Answer A)→Class 4, High Drop (Highest priority, highest drop probability)✅

AF10 (Answer B)→Class 1, Low Drop (Lowest priority, lowest drop probability)❌

AF12 (Answer C)→Class 1, Medium Drop Probability❌

AF11 (Answer D)→Class 1, Low Drop Probability❌

Why AF43?

Highest priority traffic within AF Class 4.

Highest drop probability (x3)means packets aredropped firstunder congestion.

Used forpremium but non-essential services (e.g., bulk data transfer, backups).

✅Reference:Huawei HCIE-Datacom Guide – QoS & DSCP Marking

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✅Huawei HCIE-Datacom official references

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In Huawei iMaster NCE-WAN controller active/standby deployment, to ensure seamless switchover and uninterrupted management and control channel communication, the following IPs must be configured consistently:

A. Southbound public IP addresses — Required for southbound communication from remote WAN devices via public networks.

C. Southbound private IP addresses — Used for devices accessing controllers over private links. Must remain unchanged between controllers.

D. Northbound IP addresses — For API and external system integration, ensuring upper-layer platforms don't need reconfiguration during switchover.

Internal interconnection addresses (B) are used for internal HA communication between controllers and do not need to be identical, hence not selected.

Exact Extract - Huawei HCIE-Datacom iMaster NCE-WAN Deployment Guide:

“To maintain service continuity, configure consistent southbound and northbound IP addresses across active and standby controllers. Internal interconnection addresses differ between nodes.”

Comprehensive and Detailed Explanation:

TheOSPF error outputshows:

✔Hello timer mismatch (1 error)→Hello intervals must match for adjacency formation(A)✅

✔No Netmask mismatch errors→Subnet masks are consistent, so option C is incorrect❌

✔No Extern option mismatch→No evidence of area type inconsistency (option D)❌

✔If area IDs were mismatched, adjacency would not form (option B is correct)✅

Thus, the correct answers areA and B.

📖Reference:Huawei HCIE Datacom – OSPF Troubleshooting

Comprehensive and Detailed In-Depth Explanation:

InOSPF, a Not-So-Stubby Area (NSSA) is a type of area that allows for the injection ofexternal routes(like a standard area) while maintaining some stub area characteristics.

Type 7 LSAs (NSSA External LSAs)are generated by ASBRs within an NSSA.

AnABRat the NSSA boundary translates theseType 7 LSAs into Type 5 LSAsto propagate them into the rest of the OSPF domain.

This translation is necessary becauseType 5 LSAsare the standard method for advertising external routes in OSPF.

Therefore, the statement isTRUE.

Comprehensive and Detailed In-Depth Explanation:

1. Free Mobility in Huawei Campus Networks:

Free mobility allows users to move freely within a campus network while retaining their access rights and security policies. It leveragesiMaster NCE-Campusas the controller to simplify the deployment and management of user policies.

2. Role of the Administrator:

Administrators are responsible for defining high-level policies and security configurations. Specifically:

Define a Policy Control Matrix:

Administrators create a matrix that specifies how users from different security groups interact.

This matrix outlines access permissions and is a part of the policy planning phase.

Define Security Groups:

Administrators categorize users, devices, or endpoints intosecurity groupsbased on their roles or functions.

These groups form the basis for applying uniform policies within the network.

3. Role of iMaster NCE-Campus (Controller):

The controller handles the automatic delivery of configured policies and security settings to network devices.

Deliver IP-Security Group Entries:

Once the administrator defines the policies and groups,iMaster NCE-Campusautomaticallydistributes the IP-Security Group Binding entriesto the relevant network devices.

This ensures consistent policy enforcement across the campus.

4. Why This Mapping Is Correct:

Administrators define the structure and policies, while thecontroller (iMaster NCE-Campus)handles the implementation and distribution.

This division of responsibilities optimizes the network management process, reducing human error and ensuring that policies are consistently applied.

Huawei’sSD-WAN solutionoffers a full suite of application optimization technologies, including:

Application identification: Uses DPI and traffic signatures to identify applications.

Intelligent traffic steering: Dynamically routes traffic based on application type and real-time link performance.

WAN optimization: Reduces latency, deduplicates traffic, and optimizes throughput for key apps.

QoS: Prioritizes critical applications and ensures bandwidth guarantees.

All listed options are part of the Huawei SD-WAN solutionfor optimizing user experience and application performance.

Correct answers: A, B, C, D

Understanding SSH Authentication and Key Exchange

🔹What Happens When an SSH Client Connects to a Server?

1️⃣Key Exchange Phase (KEX)

Even if onlypassword authenticationis used, SSHstill performs key exchange.

The server and clientnegotiate encryption keysusing algorithms likeDiffie-Hellman (DH).

2️⃣User Authentication Phase

After encryption keys are exchanged, the userauthenticates using a username and password.

Why is the Answer FALSE?

❌Even with password authentication, SSH still performs key exchange to establish an encrypted session.

✅The SSH session is always encrypted using cryptographic keys generated during KEX.

Real-World Application:

Secure Remote Access:Protects login credentials fromMITM (Man-in-the-Middle) attacks.

Cloud & Datacenter Networks:Ensuressecure SSH connections across remote infrastructure.

✅Reference:Huawei HCIE-Datacom Guide – SSH Key Exchange and Authentication